{"id":57,"date":"2024-11-29T10:58:09","date_gmt":"2024-11-29T02:58:09","guid":{"rendered":"https:\/\/me.websighte.com\/?p=57"},"modified":"2024-11-29T14:31:27","modified_gmt":"2024-11-29T06:31:27","slug":"%e5%86%85%e5%ad%98%e7%ae%a1%e7%90%86%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/me.websighte.com\/index.php\/2024\/11\/29\/%e5%86%85%e5%ad%98%e7%ae%a1%e7%90%86%e8%a7%a3%e6%9e%90\/","title":{"rendered":"\u5185\u5b58\u7ba1\u7406\u89e3\u6790"},"content":{"rendered":"<h3>\u76ee\u5f55<\/h3>\n<blockquote><p>\n1.\u5185\u5b58\u533a\u57df\u89e3\u6790<br \/>\n2.\u4ec0\u4e48\u662f\u5f15\u7528\u8ba1\u6570\uff08retainCount\uff09<br \/>\n3.\u4ec0\u4e48\u662f\u6307\u9488\u548c\u5730\u5740<br \/>\n4.\u5185\u5b58\u6cc4\u6f0f\u3001\u91ce\u6307\u9488\u3001\u7a7a\u6307\u9488\u3001\u50f5\u5c38\u5bf9\u8c61<br \/>\n5.\u5185\u5b58\u7ba1\u7406\u539f\u5219<br \/>\n6.\u5e38\u7528\u5185\u5b58\u4fee\u9970\u8bcd<br \/>\n7.alloc\u3001init\u3001new\u3001dealloc \u533a\u522b<br \/>\n8.\u5f3a\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u5faa\u73af\u5f15\u7528<br \/>\n9.weak\u8be6\u89e3<br \/>\n10.\u6df1\u6d45\u62f7\u8d1d\u7406\u89e3\n<\/p><\/blockquote>\n<blockquote><p>\nhttps:\/\/blog.csdn.net\/z119901214\/article\/details\/82417153?spm=1001.2014.3001.5502\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 616px;\">\n<div class=\"image-view\" data-width=\"1200\" data-height=\"1055\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-b2fb683907e6d282f8760c84136f3045.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">iOS\u5185\u5b58\u7ba1\u7406<\/div>\n<\/div>\n<h4>1.\u5185\u5b58\u533a\u57df\u89e3\u6790<\/h4>\n<blockquote><p>\n\u5e38\u8bf4\u7684\u5185\u5b58\u6709\u4e94\u5927\u533a\uff0c\u5206\u522b\u4e3a\uff1a\u5806\u533a\u3001\u6808\u533a\u3001\u5168\u5c40\u533a\uff08\u9759\u6001\u533a\uff09\u3001\u5e38\u91cf\u533a\u3001\u4ee3\u7801\u533a\uff0c\u5177\u4f53\u5982\u4e0b\u56fe\u3002<br \/>\n<strong>\u8865\u5145\u8bf4\u660e\uff1a<\/strong><br \/>\n1.\u5185\u5bb9\u5206\u4e3a\u865a\u62df\u5185\u5b58+\u7269\u7406\u5185\u5b58\uff0c\u6b63\u5e38\u521d\u59cb\u5316\u7a7a\u95f4\u5206\u914d\u7684\u90fd\u662f\u865a\u62df\u5185\u5b58\uff0c\u521d\u59cb\u5316\u5b9e\u4f8b\u624d\u4f1a\u5360\u7528\u7269\u7406\u5185\u5bb9\u3002Instrument \u7684 Allocations \u5de5\u5177\u53ef\u4ee5\u76d1\u63a7\uff0cAll Heap &#038; Anoymous VM \u4ee3\u8868\u865a\u62df\u5185\u5b58 Dirty Memory\uff0cresident Size \u5c31\u662f\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\u3002<br \/>\n2.\u8bbf\u95ee\u5185\u5b58\u5176\u5b9e\u90fd\u662f\u8bbf\u95ee\u7684\u903b\u8f91\u5730\u5740\uff0c\u9700\u8981\u8f6c\u6362\u540e\u624d\u80fd\u8bbf\u95ee\u7269\u7406\u5185\u5b58\uff0c CPU\u6839\u636e\u903b\u8f91\u5730\u5740\u901a\u8fc7\u754c\u9650\u5bc4\u5b58\u5668\u5224\u65ad\u662f\u5426\u8d8a\u754c\uff0c\u8d8a\u754c\u5730\u5740\u9519\u8bef\uff0c\u53cd\u4e4b\u52a0\u4e0a\u57fa\u5740\u5bc4\u5b58\u5668\u8f6c\u6362\u6210\u7269\u7406\u5185\u5b58\u5730\u5740\u3002<br \/>\n3.iOS \u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u4e3b\u8981\u6709\u4e24\u7c7b\uff1a<br \/>\n\u4e00\u7c7b\u662f\u503c\u7c7b\u578b\uff1b\u6bd4\u5982 int\u3001float\u3001struct \u7b49\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u503c\u7c7b\u578b\u4f1a\u88ab\u653e\u5165\u6808\u4e2d\uff0c\u9075\u5faa\u5148\u8fdb\u540e\u51fa\u7684\u539f\u5219\u3002<br \/>\n\u4e00\u7c7b\u662f\u5f15\u7528\u7c7b\u578b\uff1b\u4e5f\u5c31\u662f\u7ee7\u627f NSObject \u7c7b\u7684\u6240\u6709 OC \u5bf9\u8c61\u3002\u5f15\u7528\u7c7b\u578b\u4f1a\u653e\u5728\u5806\u4e2d\uff0c\u5f53\u7ed9\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u7a7a\u95f4\u65f6\uff0c\u5bf9\u968f\u673a\u5728\u5185\u5b58\u4e2d\u5f00\u8f9f\u7a7a\u95f4\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>iOS \u5185\u5b58\u8fc7\u591a\u800c\u88ab Kill \u6389\uff1f\u57fa\u4e8e\u4ec0\u4e48\u539f\u5219\uff1f<\/strong><\/li>\n<\/ul>\n<blockquote><p>\niOS \u4f7f\u7528\u7684\u662f\u4f4e\u5185\u5b58\u5904\u7406\u673a\u5236 Jetsam\uff0c\u57fa\u4e8e\u4f18\u5148\u7ea7\u961f\u5217\u7684\u673a\u5236\u3002 \u5f53\u5185\u5b58\u8fc7\u4f4e\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u5728\u961f\u5217\u4e2d\u8fdb\u884c\u5e7f\u64ad\uff0c\u5e0c\u671b\u5927\u5bb6\u5c3d\u91cf\u91ca\u653e\u5185\u5b58\uff0c\u5982\u679c\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u4ecd\u7136\u5185\u5b58\u4e0d\u591f\uff0c\u5c31\u4f1a\u5f00\u59cb Kill \u8fdb\u7a0b\uff0c\u76f4\u5230\u5185\u5b58\u591f\u7528\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u5176\u4ed6\u76f8\u5173\u8865\u5145\u8bf4\u660e\uff1a<\/strong><\/li>\n<\/ul>\n<blockquote><p>\n1.RAM\uff1a\u8fd0\u884c\u5185\u5b58\uff0c\u4e0d\u80fd\u6389\u7535\u5b58\u50a8\u3002ROM\uff1a\u5b58\u50a8\u6027\u5185\u5b58\uff0c\u53ef\u4ee5\u6389\u7535\u5b58\u50a8\uff0c\u4f8b\u5982\u5185\u5b58\u5361\u3001Flash\u3002\u7531\u4e8eRAM\u7c7b\u578b\u4e0d\u5177\u5907\u6389\u7535\u5b58\u50a8\u80fd\u529b\u5373\u4e00\u6389\u7535\u6570\u636e\u6d88\u5931\uff0c\u6240\u4ee5app\u7a0b\u5e8f\u4e00\u822c\u5b58\u653e\u4e8eROM\u4e2d\u3002RAM\u7684\u8bbf\u95ee\u901f\u5ea6\u8981\u8fdc\u9ad8\u4e8eROM\uff0c\u4ef7\u683c\u4e5f\u8981\u9ad8\u3002<br \/>\n2.App\u7a0b\u5e8f\u542f\u52a8\uff1aApp\u7a0b\u5e8f\u542f\u52a8\uff0c\u7cfb\u7edf\u4f1a\u628a\u5f00\u542f\u7684\u90a3\u4e2aApp\u7a0b\u5e8f\u4eceFlash\u6216ROM\u91cc\u9762\u62f7\u8d1d\u5230\u5185\u5b58\uff08RAM\uff09\uff0c\u7136\u540e\u4ece\u5185\u5b58\u91cc\u9762\u6267\u884c\u4ee3\u7801\u3002\u53e6\u4e00\u4e2a\u539f\u56e0\u662fCPU\u4e0d\u80fd\u76f4\u63a5\u4ece\u5185\u5b58\u5361\u91cc\u9762\u8bfb\u53d6\u6307\u4ee4\uff08\u9700\u8981Flash\u9a71\u52a8\u7b49\u7b49\uff09\u3002<br \/>\n3.\u5728iOS\u4e2d\uff0c\u5806\u533a\u7684\u5185\u5b58\u662f\u5e94\u7528\u7a0b\u5e8f\u5171\u4eab\u7684\uff0c\u5806\u4e2d\u7684\u5185\u5b58\u5206\u914d\u662f\u7cfb\u7edf\u8d1f\u8d23\u7684\uff1b\u7cfb\u7edf\u4f7f\u7528\u4e00\u4e2a\u94fe\u8868\u6765\u7ef4\u62a4\u6240\u6709\u5df2\u7ecf\u5206\u914d\u7684\u5185\u5b58\u7a7a\u95f4\uff08\u7cfb\u7edf\u4ec5\u4ec5\u7eaa\u5f55\uff0c\u5e76\u4e0d\u7ba1\u7406\u5177\u4f53\u7684\u5185\u5bb9\uff09\uff1b\u53d8\u91cf\u4f7f\u7528\u7ed3\u675f\u540e\uff0c\u9700\u8981\u91ca\u653e\u5185\u5b58\uff0cOC\u4e2d\u662f\u6839\u636e\u5f15\u7528\u8ba1\u6570\u4e3a0\uff0c\u5c31\u8bf4\u660e\u6ca1\u6709\u4efb\u4f55\u53d8\u91cf\u4f7f\u7528\u8be5\u7a7a\u95f4\uff0c\u90a3\u4e48\u7cfb\u7edf\u5c06\u76f4\u63a5\u6536\u56de\uff1b\u5f53\u4e00\u4e2aapp\u542f\u52a8\u540e\uff0c\u4ee3\u7801\u533a\uff0c\u5e38\u91cf\u533a\uff0c\u5168\u5c40\u533a\u5927\u5c0f\u5df2\u56fa\u5b9a\uff0c\u56e0\u6b64\u6307\u5411\u8fd9\u4e9b\u533a\u7684\u6307\u9488\u4e0d\u4f1a\u4ea7\u751f\u5d29\u6e83\u6027\u7684\u9519\u8bef\u3002\u800c\u5806\u533a\u548c\u6808\u533a\u662f\u65f6\u65f6\u523b\u523b\u53d8\u5316\u7684\uff08\u5806\u7684\u521b\u5efa\u9500\u6bc1\uff0c\u6808\u7684\u5f39\u5165\u5f39\u51fa\uff09\uff0c\u6240\u4ee5\u5f53\u4f7f\u7528\u4e00\u4e2a\u6307\u9488\u6307\u5411\u8fd9\u4e24\u4e2a\u533a\u91cc\u9762\u7684\u5185\u5b58\u65f6\uff0c\u4e00\u5b9a\u8981\u6ce8\u610f\u5185\u5b58\u662f\u5426\u5df2\u7ecf\u88ab\u91ca\u653e\uff0c\u5426\u5219\u4f1a\u4ea7\u751f\u7a0b\u5e8f\u5d29\u6e83\uff08\u5373\u662f\u91ce\u6307\u9488\u62a5\u9519\uff09\u3002<br \/>\n4.iOS\u662f\u57fa\u4e8eUNIX\u3001Android\u662f\u57fa\u4e8eLinux\u7684\uff0c\u5728Linux\u548cunix\u7cfb\u7edf\u4e2d\uff0c\u5185\u5b58\u7ba1\u7406\u7684\u65b9\u5f0f\u57fa\u672c\u76f8\u540c\uff1bAndroid\u5e94\u7528\u7a0b\u5e8f\u7684\u5185\u5b58\u5206\u914d\u4e5f\u662f\u5982\u6b64\u3002\u9664\u6b64\u4ee5\u5916\uff0c\u8fd9\u4e9b\u5e94\u7528\u5c42\u7684\u7a0b\u5e8f\u4f7f\u7528\u7684\u90fd\u662f\u865a\u62df\u5185\u5b58\uff0c\u5b83\u4eec\u90fd\u662f\u5efa\u7acb\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e4b\u4e0a\u7684\uff0c\u53ea\u6709\u5f00\u53d1\u5e95\u5c42\u9a71\u52a8\u6216\u677f\u7ea7\u652f\u6301\u5305\u65f6\u624d\u4f1a\u63a5\u89e6\u5230\u7269\u7406\u5185\u5b58\u3002\u4e3e\u4f8b\uff1a\u5728\u5d4c\u5165\u5f0fLinux\u4e2d\uff0c\u5b9e\u9645\u7684\u7269\u7406\u5730\u5740\u53ea\u670964M\u751a\u81f3\u66f4\u5c0f\uff0c\u4f46\u662f\u865a\u62df\u5185\u5b58\u5374\u53ef\u4ee5\u9ad8\u8fbe4G\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u7ebf\u7a0b\u4e2d\u6808\u4e0e\u5806\u662f\u516c\u6709\u7684\u8fd8\u662f\u79c1\u6709\u7684\uff1f<\/strong><\/li>\n<\/ul>\n<blockquote><p>\n1.\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u62e5\u6709\u4e00\u4e2a\u6808\u548c\u7a0b\u5e8f\u8ba1\u6570\u5668\uff0c\u6808\u548c\u7a0b\u5e8f\u8ba1\u6570\u5668\u7528\u6765\u4fdd\u5b58\u7ebf\u7a0b\u6267\u884c\u5386\u53f2\u548c\u7ebf\u7a0b\u6267\u884c\u7684\u72b6\u6001\uff0c\u662f\u7ebf\u7a0b\u79c1\u6709\u8d44\u6e90\u3002<br \/>\n2.\u5806\u8d44\u6e90\u662f\u7edf\u4e00\u8fdb\u7a0b\u5185\u591a\u7ebf\u7a0b\u5171\u4eab\u7684\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 620px;\">\n<div class=\"image-view\" data-width=\"1063\" data-height=\"620\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-39c778531a5eeb38ebfe63f4872ed132.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u5185\u5b58\u4e94\u5927\u533a<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 622px;\">\n<div class=\"image-view\" data-width=\"1105\" data-height=\"981\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-40608323db6b8eb96a2e54eea05c6617.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u5185\u5b58\u533a\u57df\u5206\u5e03<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 541px; max-height: 410px;\">\n<div class=\"image-view\" data-width=\"541\" data-height=\"410\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-ae1da0485c5dde859d07b30482f41921.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u8fd9\u4e2a\u4ee3\u7801\u533a\u5b58\u653e\u4e8e\u4f4e\u5730\u5740\uff0c\u6808\u533a\u5b58\u653e\u4e8e\u9ad8\u5730\u5740\uff0c\u533a\u4e0e\u533a\u4e4b\u95f4\u5e76\u4e0d\u662f\u8fde\u7eed\u7684\u3002\u6808\u533a\uff1a\u7a0b\u5e8f\u733f\u4e0d\u9700\u8981\u7ba1\u7406\u6808\u533a\u53d8\u91cf\u7684\u5185\u5b58\uff0c\u6808\u533a\u5730\u5740\u4ece\u9ad8\u5230\u4f4e\u5206\u914d\uff1b\u5806\u533a\uff1a\u5185\u5b58\u5206\u914d\u4f7f\u7528\u7684\u662falloc\uff0c\u9700\u8981\u7a0b\u5e8f\u733f\u7ba1\u7406\u5185\u5b58\uff0c\u5806\u533a\u7684\u5730\u5740\u662f\u4ece\u4f4e\u5230\u9ad8\u5206\u914d\uff1b\u5168\u5c40\u533a\uff0f\u9759\u6001\u533a\uff1a\u5305\u62ec\u672a\u521d\u59cb\u5316\u8fc7\u548c\u521d\u59cb\u5316\u8fc7\uff0c\u5168\u5c40\u533a\/\u9759\u6001\u533a\u5728\u5185\u5b58\u4e2d\u662f\u653e\u5728\u4e00\u8d77\u7684\uff0c\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\u5728\u4e00\u5757\u533a\u57df\uff0c\u672a\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u548c\u672a\u521d\u59cb\u5316\u7684\u9759\u6001\u53d8\u91cf\u5728\u76f8\u90bb\u7684\u53e6\u4e00\u5757\u533a\u57df\uff0c\u6bd4\u5982 int a;\u672a\u521d\u59cb\u5316\u7684\uff0cint a=10;\u5df2\u521d\u59cb\u5316\uff1b\u5e38\u91cf\u533a\uff1a\u5e38\u91cf\u5b57\u7b26\u4e32\u5c31\u662f\u653e\u5728\u8fd9\u91cc\uff1b\u4ee3\u7801\u533a\uff1a\u5b58\u653eApp\u4ee3\u7801<\/div>\n<\/div>\n<h4>2.\u4ec0\u4e48\u662f\u5f15\u7528\u8ba1\u6570\uff08retainCount\uff09<\/h4>\n<blockquote><p>\n\u5f15\u7528\u8ba1\u6570\u662f\u4e00\u4e2a\u7b80\u5355\u800c\u6709\u6548\u7684\u7ba1\u7406 OC \u5bf9\u8c61\u751f\u547d\u5468\u671f\u7684\u65b9\u5f0f\uff0c\u4e0d\u7ba1\u662f OC \u8fd8\u662f Swift \u5176\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f\uff08\u539f\u7406\uff09\u90fd\u662f\u57fa\u4e8e\u5f15\u7528\u8ba1\u6570\u7684\u3002\u5f15\u7528\u8ba1\u6570\u4e5f\u53eb\u5185\u5b58\u8ba1\u6570\u3002<br \/>\n<strong>\u539f\u7406\uff1a<\/strong><br \/>\n\u5f15\u7528\u8ba1\u6570\u53ef\u4ee5\u6709\u6548\u7684\u7ba1\u7406\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\uff0c\u5f53\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u4ed6\uff08\u8be5\u5bf9\u8c61\u6240\u5728\u7684\u5185\u5b58\u5757\uff09\u7684\u5f15\u7528\u8ba1\u6570\u4e3a1\uff0c\u5f53\u6709\u4e00\u4e2a\u65b0\u7684\u6307\u9488\u6307\u5411\u8fd9\u4e2a\u5bf9\u8c61\u65f6\uff0c\u6211\u4eec\u5c06\u5176\u5f15\u7528\u8ba1\u6570\u52a01\uff0c\u5f53\u67d0\u4e2a\u6307\u9488\u4e0d\u5728\u6307\u5411\u8fd9\u4e2a\u6307\u9488\u65f6\uff0c\u6211\u4eec\u5c06\u5176\u5e94\u7528\u8ba1\u6570\u51cf1\uff0c\u5f53\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u53d8\u4e3a0\u65f6\uff0c\u8bf4\u660e\u8fd9\u5757\u5185\u5b58\u4e0d\u5728\u88ab\u4efb\u4f55\u6307\u9488\u6307\u5411\uff0c\u8fd9\u4e2a\u65f6\u5019\u7cfb\u7edf\u5c31\u4f1a\u5c06\u5bf9\u8c61\u9500\u6bc1\uff0c\u56de\u6536\u5185\u5b58\uff0c\u4ece\u800c\u8fbe\u5230\u7ba1\u7406\u5185\u5b58\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u5728 OC \u4e2d\u5bf9\u8c61\u4ec0\u4e48\u65f6\u5019\u4f1a\u88ab\u91ca\u653e\uff08\u6216\u8005\u5bf9\u8c61\u5360\u7528\u7684\u5185\u5b58\u4ec0\u4e48\u65f6\u5019\u4f1a\u88ab\u56de\u6536\u5229\u7528\uff09\uff1f<\/strong><\/li>\n<\/ul>\n<blockquote><p>\n\u5f53\u5bf9\u8c61\u6ca1\u6709\u88ab\u4efb\u4f55\u53d8\u91cf\u5f15\u7528\uff08\u4e5f\u53ef\u4ee5\u8bf4\u662f\u6ca1\u6709\u6307\u9488\u6307\u5411\u8be5\u5bf9\u8c61\uff09\u7684\u65f6\u5019\u5c31\u4f1a\u88ab\u91ca\u653e\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 419px;\">\n<div class=\"image-view\" data-width=\"752\" data-height=\"419\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-c3a39d8d72cdf168ae2e1333ad5fa04d.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u5982\u4f55\u77e5\u9053\u5bf9\u8c61\u5df2\u7ecf\u6ca1\u6709\u88ab\u5f15\u7528<\/div>\n<\/div>\n<ul>\n<li><strong>\u5f15\u7528\u8ba1\u6570\u4e3e\u4f8b<\/strong><\/li>\n<\/ul>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 355px;\">\n<div class=\"image-view\" data-width=\"1640\" data-height=\"830\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-abca70f5112af21c2851ed9655010d44.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u5f15\u7528\u8ba1\u6570\u4e3e\u4f8b<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 619px;\">\n<div class=\"image-view\" data-width=\"951\" data-height=\"619\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-3119f4c4bfbfacbf2807cd1ec043cc16.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u5f15\u7528\u8ba1\u6570\u4e3e\u4f8b<\/div>\n<\/div>\n<ul>\n<li><strong>\u6ce8\u610f\u4e00\u4e9b\u7279\u6b8a\u7684\u60c5\u51b5<\/strong><\/li>\n<\/ul>\n<blockquote><p>\nNSString \u5f15\u7528\u8ba1\u6570\u95ee\u9898\u6bd4\u8f83\u590d\u6742\uff0c\u5177\u4f53\u53c2\u8003\u94fe\u63a5\uff1a<br \/>\nhttps:\/\/blog.csdn.net\/shisanshuno1\/article\/details\/79810620<br \/>\nhttps:\/\/www.jianshu.com\/p\/990e5252e0fb\n<\/p><\/blockquote>\n<h4>3.\u4ec0\u4e48\u662f\u6307\u9488\u548c\u5730\u5740<\/h4>\n<blockquote><p>\n<strong>\u6307\u9488\uff1a<\/strong>\u5176\u5b9e\u662f\u4e00\u4e2a\u5185\u5b58\u5730\u5740\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u5185\u5b58\u5355\u5143\u6765\u8bf4\uff0c\u5355\u5143\u7684\u5730\u5740\u5373\u4e3a\u6307\u9488\u3002\u6307\u9488\u662f\u7528\u4e8e\u5b58\u653e\u53d8\u91cf\u7684\u5730\u5740\uff0c\u7528\u4e8e\u5b58\u653e\u53d8\u91cf\u5730\u5740\u7684\u53d8\u91cf\u79f0\u4e3a\u201c\u6307\u9488\u53d8\u91cf\u201d\u3002\u7a0b\u5e8f\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u901a\u8fc7\u6307\u9488\u6765\u627e\u5230\u8981\u64cd\u4f5c\u7684\u6570\u636e\u548c\u53ef\u6267\u884c\u7684\u51fd\u6570\u4ee3\u7801\u3002<br \/>\n<strong>\u5730\u5740\uff1a<\/strong>\u8868\u793a\u5185\u5b58\u7a7a\u95f4\u7684\u4e00\u4e2a\u4f4d\u7f6e\u70b9\uff0c\u4ed6\u662f\u7528\u6765\u8d4b\u7ed9\u6307\u9488\u7684\uff0c\u5730\u5740\u672c\u8eab\u662f\u6ca1\u6709\u5927\u5c0f\u6982\u5ff5\uff0c\u6307\u9488\u6307\u5411\u53d8\u91cf\u7684\u5927\u5c0f\uff0c\u53d6\u51b3\u4e8e\u5730\u5740\u540e\u9762\u5b58\u653e\u7684\u53d8\u91cf\u7c7b\u578b\u3002<strong>\u53d8\u91cf\u7684\u5730\u5740\uff1a<\/strong>\u8ba1\u7b97\u673a\u7684\u5185\u5b58\u662f\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u7684\u4e00\u7247\u8fde\u7eed\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u6bcf\u4e00\u4e2a\u5b57\u8282\u90fd\u6709\u4e00\u4e2a\u7f16\u53f7\uff0c\u8fd9\u4e2a\u7f16\u53f7\u5c31\u662f\u8be5\u5185\u5b58\u7684\u5730\u5740\uff0c\u5e76\u4e14\u8fd9\u4e9b\u7f16\u53f7\u662f\u8fde\u7eed\u7684\u3002\u800c\u4e00\u4e2a\u53d8\u91cf\u5b9e\u8d28\u4e0a\u4ee3\u8868\u4e86\u201c\u5185\u5b58\u4e2d\u7684\u67d0\u4e2a\u5b58\u50a8\u5355\u5143\u201d\uff0c\u800c\u8fd9\u4e9b\u5b58\u50a8\u5355\u5143\u7684\u7f16\u53f7\u5c31\u662f\u8be5\u53d8\u91cf\u7684\u5730\u5740\u3002<br \/>\n<strong>\u8bf4\u660e\uff1a<\/strong><br \/>\n1.\u6307\u9488\u603b\u5171\u53ef\u4ee5\u5206\u4e3a\u4e24\u79cd\uff0c\u51fd\u6570\u6307\u9488\u548c\u6570\u636e\u6307\u9488\u3002<br \/>\n2.\u6307\u9488\u7684\u4f7f\u7528\u4e00\u5b9a\u8981\u7279\u522b\u6ce8\u610f\uff0c\u4e0d\u80fd\u8d8a\u754c\uff0c\u4e0d\u8981\u4f7f\u7528\u672a\u521d\u59cb\u5316\u8fc7\u7684\u6307\u9488\u3002<br \/>\n<strong>\u4e00\u7ea7\u3001\u4e8c\u7ea7\u3001\u591a\u7ea7\u6307\u9488\uff1a<\/strong>https:\/\/blog.csdn.net\/OMGMac\/article\/details\/122152963\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u6307\u9488\u548c\u5730\u5740\u7684\u533a\u522b<\/strong><\/li>\n<\/ul>\n<blockquote><p>\n1.\u6307\u9488\u548c\u5730\u5740\u6700\u5927\u7684\u533a\u522b\u5c31\u662f\u6307\u9488\u662f\u6709\u7c7b\u578b\u7684\uff0c\u5730\u5740\u662f\u6ca1\u6709\u7c7b\u578b\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u7edd\u5bf9\u5730\u5740\u7684\u65b9\u5f0f\u627e\u5230\u51fd\u6570\u548c\u6570\u636e\uff0c\u4f46\u662f\u5730\u5740\u662f\u6ca1\u6709\u7c7b\u578b\u7684\uff0c\u4e0d\u80fd\u5bf9\u5730\u5740\u8fdb\u884c\u7b97\u672f\u64cd\u4f5c\uff0c\u5728\u6d89\u53ca\u8bf8\u5982\u6570\u7ec4\u7b49\u64cd\u4f5c\u65f6\u5c31\u4e0d\u80fd\u901a\u8fc7\u5730\u5740\u7684\u81ea\u589e\u548c\u81ea\u51cf\u6765\u8bbf\u95ee\u6570\u7ec4\u7684\u5404\u4e2a\u53d8\u91cf\u3002\u4f46\u662f\u901a\u8fc7\u5bf9\u6307\u9488\u7684\u5f15\u7528\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7\u5bf9\u6307\u9488\u8fdb\u884c\u4e00\u7cfb\u5217\u7684\u52a0\u52a0\u51cf\u51cf\u64cd\u4f5c\u5f88\u65b9\u4fbf\u7684\u8bbf\u95ee\u6570\u7ec4\u7684\u5404\u4e2a\u5143\u7d20\u3002<br \/>\n2.\u6307\u9488\u662f\u7531\u5730\u5740\u548c\u7c7b\u578b\u4e24\u90e8\u5206\u6784\u6210\u7684\uff1b<strong>\u6307\u5411\u6570\u636e\u7684\u6307\u9488<\/strong>\u4e0d\u4ec5\u8bb0\u5f55\u8be5\u6570\u636e\u7684\u5728\u5185\u5b58\u4e2d\u7684\u5b58\u653e\u7684\u5730\u5740\uff0c\u8fd8\u8bb0\u5f55\u8be5\u6570\u636e\u7684\u7c7b\u578b\uff0c\u5373\u5728\u5185\u5b58\u4e2d\u5360\u7528\u51e0\u4e2a\u5b57\u8282\uff0c\u8fd9\u662f\u5730\u5740\u6240\u4e0d\u5177\u6709\u7684\u3002<strong>\u6307\u5411\u51fd\u6570\u7684\u6307\u9488<\/strong>\u4e0d\u4ec5\u8bb0\u5f55\u51fd\u6570\u7684\u5165\u53e3\u5730\u5740\uff0c\u4e5f\u8bb0\u5f55\u8be5\u51fd\u6570\u7684\u7c7b\u578b\uff0c\u5373\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u548c\u8be5\u51fd\u6570\u7684\u53c2\u6570\u7c7b\u578b\u3002<br \/>\n3.\u6307\u9488\u610f\u5473\u7740\u5df2\u7ecf\u6709\u4e00\u4e2a\u6307\u9488\u53d8\u91cf\u5b58\u5728\uff0c\u4ed6\u7684\u503c\u662f\u4e00\u4e2a\u5730\u5740\uff0c\u6307\u9488\u53d8\u91cf\u672c\u8eab\u4e5f\u5b58\u653e\u5728\u4e00\u4e2a\u957f\u5ea6\u4e3a\u56db\u4e2a\u5b57\u8282\u7684\u5730\u5740\u5f53\u4e2d\uff0c\u800c\u5730\u5740\u6982\u5ff5\u672c\u8eab\u5e76\u4e0d\u4ee3\u8868\u6709\u4efb\u4f55\u53d8\u91cf\u5b58\u5728\u3002\u6307\u9488\u7684\u503c\u5982\u679c\u6ca1\u6709\u9650\u5236\uff0c\u901a\u5e38\u662f\u53ef\u4ee5\u53d8\u5316\u7684\u4e5f\u53ef\u4ee5\u6307\u5411\u53e6\u5916\u4e00\u4e2a\u5730\u5740\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u6307\u9488\u53d8\u91cf\u7684\u5b9a\u4e49\u548c\u6307\u9488\u53d8\u91cf\u7684\u57fa\u7c7b\u578b<\/strong><\/li>\n<\/ul>\n<p>1.\u5b9a\u4e49\u6307\u9488\u53d8\u91cf\u7684\u4e00\u822c\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre><code>\u7c7b\u578b\u540d  *\u6307\u9488\u53d8\u91cf\u540d1; *\u6307\u9488\u53d8\u91cf\u540d2\uff0c...........;  \n\u4f8b\u5982\uff1aint *p,*q;\n\u6ce8\u610f\uff1a\u6bcf\u4e2a\u53d8\u91cf\u524d\u7684\u661f\u53f7\u662f\u4e00\u4e2a\u8bf4\u660e\u7b26\uff0c\u7528\u6765\u8bf4\u660e\u8be5\u53d8\u91cf\u662f\u6307\u9488\u53d8\u91cf\u3002\u53d8\u91cf\u524d\u7684\u661f\u53f7\u4e0d\u53ef\u7701\u7565\uff0c\u82e5\u7701\u7565\u4e86\u661f\u53f7\u8bf4\u660e\u7b26\uff0c\u5c31\u53d8\u6210\u4e86\u5c06 p \u548c q \u5b9a\u4e49\u4e3a\u6574\u5f62\u53d8\u91cf\u3002\n<\/code><\/pre>\n<p>2.\u6307\u9488\u53d8\u91cf\u7684\u57fa\u7c7b\u578b\uff1a<\/p>\n<blockquote><p>\n\u5728\u8fd9\u91cc\u4e3b\u8981\u8bf4\u660e\u4e00\u4e0b\u4e3a\u4ec0\u4e48\u6307\u9488\u5fc5\u987b\u533a\u5206\u57fa\u7c7b\u578b\u3002\u4e00\u4e2a\u6307\u9488\u53d8\u91cf\u4e2d\u5b58\u653e\u7684\u662f\u4e00\u4e2a\u5b58\u50a8\u5355\u5143\u7684\u5730\u5740\u3002\u8fd9\u91cc\u201c\u4e00\u4e2a\u5b58\u50a8\u5355\u5143\u201d\u4e2d\u7684\u201c\u4e00\u201d\u6240\u4ee3\u8868\u7684\u5b57\u8282\u6570\u662f\u4e0d\u540c\u7684\uff1a\u5bf9 short int \u7c7b\u578b\u6574\u6570\u800c\u8a00\uff0c\u5b83\u4ee3\u88682\u4e2a\u5b57\u8282\uff1b\u5bf9 int \u7c7b\u578b\u800c\u8a00\uff0c\u5b83\u4ee3\u88684\u4e2a\u5b57\u8282\uff0c\u8fd9\u5c31\u662f\u57fa\u7c7b\u578b\u7684\u4e0d\u540c\u542b\u4e49\u3002\u5728\u6d89\u53ca\u6307\u9488\u7684\u79fb\u52a8\uff0c\u4e5f\u5c31\u662f\u8981\u5bf9\u5730\u5740\u8fdb\u884c\u589e\u51cf\u8fd0\u7b97\uff0c\u8fd9\u65f6\u6307\u9488\u79fb\u52a8\u7684\u6700\u5c0f\u5355\u4f4d\u662f\u4e00\u4e2a\u50a8\u5b58\u5355\u5143\uff0c\u800c\u4e0d\u662f1\u4e2a\u5b57\u8282\u3002\u56e0\u6b64\u5bf9\u4e8e\u57fa\u7c7b\u578b\u4e0d\u540c\u7684\u6307\u9488\u53d8\u91cf\uff0c\u5176\u5185\u5bb9\u589e1\u3001\u51cf1\u6240\u201c\u8de8\u8d8a\u201d\u7684\u5b57\u8282\u6570\u4e0d\u540c\uff0c\u56e0\u6b64\u57fa\u7c7b\u578b\u4e0d\u540c\u7684\u6307\u9488\u53d8\u91cf\u4e0d\u80fd\u6df7\u5408\u4f7f\u7528\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u5e38\u91cf\u6307\u9488\u548c\u6307\u9488\u5e38\u91cf<\/strong><\/li>\n<\/ul>\n<blockquote><p>\nhttps:\/\/juejin.cn\/post\/6972041530726940685\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 582px;\">\n<div class=\"image-view\" data-width=\"783\" data-height=\"582\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-355910f335f6a8de1ef202c0aea92816.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u5e38\u91cf\u6307\u9488<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 594px;\">\n<div class=\"image-view\" data-width=\"803\" data-height=\"594\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-f5bd3d128d57153a64f8cae258a04156.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u6307\u9488\u5e38\u91cf<\/div>\n<\/div>\n<h4>4.\u5185\u5b58\u6cc4\u6f0f\u3001\u91ce\u6307\u9488\u3001\u7a7a\u6307\u9488\u3001\u50f5\u5c38\u5bf9\u8c61<\/h4>\n<p><strong>\u5185\u5b58\u6cc4\u6f0f<\/strong><\/p>\n<blockquote><p>\n\u6211\u4eec\u77e5\u9053 iOS \u5f00\u53d1\u6709 \u201cARC \u673a\u5236\u201d \u5e2e\u5fd9\u7ba1\u7406\u5185\u5b58\uff0c\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u5982\u679c\u5904\u7406\u4e0d\u597d\u5806\u7a7a\u95f4\u4e0a\u7684\u5185\u5b58\u8fd8\u662f\u4f1a\u5b58\u5728\u5185\u5b58\u6cc4\u6f0f\u7684\u95ee\u9898\u3002\u5982\u679c\u5185\u5b58\u6cc4\u6f0f\u4e25\u91cd\uff0c\u6700\u7ec8\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u7684\u5d29\u6e83\u3002\u6211\u4eec\u9700\u8981\u68c0\u67e5\u6211\u4eec\u7684 App \u6709\u6ca1\u6709\u5185\u5b58\u6cc4\u6f0f\uff0c\u5e76\u4e14\u5feb\u901f\u5b9a\u4f4d\u5230\u5185\u5b58\u6cc4\u6f0f\u7684\u4ee3\u7801\uff0c\u6bd4\u8f83\u5e38\u7528\u7684\u5185\u5b58\u6cc4\u6f0f\u7684\u6392\u67e5\u65b9\u6cd5\u6709\u4e24\u79cd\uff0c\u90fd\u5728 Xcode \u4e2d\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\uff1a\u7b2c\u4e00\u79cd\u4e3a\u9759\u6001\u5206\u6790\u65b9\u6cd5\uff08Analyze\uff09\u3001\u7b2c\u4e8c\u79cd\u4e3a\u52a8\u6001\u5206\u6790\u65b9\u6cd5\uff08Instrument \u5de5\u5177\u5e93\u91cc\u7684 Leaks\uff09\uff0c\u4e00\u822c\u63a8\u8350\u4f7f\u7528\u7b2c\u4e8c\u79cd\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong><br \/>\nhttps:\/\/juejin.cn\/post\/6844903681649803278<br \/>\nhttps:\/\/juejin.cn\/post\/7033233548249153550\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u4ec0\u4e48\u65f6\u5019\u4f1a\u53d1\u751f\u5185\u5b58\u6cc4\u6f0f<\/strong><\/li>\n<\/ul>\n<blockquote><p>\nhttps:\/\/juejin.cn\/post\/6844904070344343565<br \/>\nhttps:\/\/www.jianshu.com\/p\/6c4849dcef55\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u4e3e\u4f8b\uff1a\u6808 &#8211; \u6cc4\u9732<\/strong><\/li>\n<\/ul>\n<pre><code>int number = 4;\nint *a = malloc(8);\na = &number;\nfree(a);\n\n\u7ed9\u6307\u9488 a \u5206\u914d\u4e868\u4e2a\u5b57\u8282\u7684\u5730\u5740\uff0ca \u53c8\u6307\u5411\u4e86 number \u7684\u5730\u5740\uff0c\u6700\u540e a \u91ca\u653e\u4e86\u3002\n\u8fd9\u65f6\u5019\u91ca\u653e\u7684\u662f number \u7684\u5730\u5740\uff0c\u800c number \u662f\u5728\u6808\u533a\u4e2d\uff0c\u4e0d\u80fd\u88ab\u624b\u52a8\u91ca\u653e\uff0c\u8fd9\u65f6\u5019\u5c31\u51fa\u73b0\u4e86\u6808\u7684\u5185\u5b58\u6cc4\u9732\u3002\n<\/code><\/pre>\n<p><strong>\u91ce\u6307\u9488<\/strong><\/p>\n<blockquote><p>\n\u91ce\u6307\u9488\uff1a\u91ce\u6307\u9488\u51fa\u73b0\u7684\u539f\u56e0\u662f\u6307\u9488\u6ca1\u6709\u8d4b\u503c\u6216\u8005\u6307\u9488\u6307\u5411\u7684\u5bf9\u8c61\u5df2\u7ecf\u88ab\u91ca\u653e\u6389\u4e86\uff0c\u91ce\u6307\u9488\u6307\u5411\u4e00\u5757\u968f\u673a\u7684\u5783\u573e\u5185\u5b58\uff0c\u5411\u4ed6\u4eec\u53d1\u9001\u6d88\u606f\u4f1a\u62a5 EXC_BAD_ACCESS \u9519\u8bef\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u3002\u91ce\u6307\u9488\u662f\u4e0d\u4e3a nil \u4f46\u662f\u6307\u5411\u5df2\u7ecf\u88ab\u91ca\u653e\u5185\u5b58\u7684\u6307\u9488\uff0c\u6bd4\u5982 __unsafe_unretain \u6216\u8005 assign \u7684\u6307\u9488\uff0c\u5bf9\u8c61\u91ca\u653e\u540e\u4f1a\u51fa\u73b0\u91ce\u6307\u9488\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong><br \/>\nhttps:\/\/juejin.cn\/post\/6844903747538141191<br \/>\nhttps:\/\/juejin.cn\/post\/6930979515552235528\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u4ea7\u751f\u91ce\u6307\u9488\uff1f<\/strong><\/li>\n<\/ul>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 575px;\">\n<div class=\"image-view\" data-width=\"862\" data-height=\"707\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-4cdc0cb20bd2de1b122b0166d256062f.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u91ce\u6307\u9488\u9700\u8981\u6ee1\u8db3\u4e24\u4e2a\u6761\u4ef6<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 572px;\">\n<div class=\"image-view\" data-width=\"821\" data-height=\"572\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-abbb6f4f63d541a30053252ac4394d2a.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u4ea7\u751f\u91ce\u6307\u9488<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 641px;\">\n<div class=\"image-view\" data-width=\"918\" data-height=\"641\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-d9eb8fa9eaa656a81c1854d2b5a023d7.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u4f7f\u7528\u91ce\u6307\u9488\u53ef\u80fd\u51fa\u73b0\u7684\u60c5\u51b5<\/div>\n<\/div>\n<p><strong>\u7a7a\u6307\u9488<\/strong><\/p>\n<blockquote><p>\n\u7a7a\u6307\u9488\uff1a\u7a7a\u6307\u9488\u4e0d\u540c\u4e8e\u91ce\u6307\u9488\uff0c\u5b83\u662f\u4e00\u4e2a\u6ca1\u6709\u6307\u5411\u4efb\u4f55\u4e1c\u897f\u7684\u6307\u9488\uff0c\u7a7a\u6307\u9488\u662f\u6709\u6548\u6307\u9488\uff0c\u503c\u4e3a nil\u3001NULL\u3001Nil \u62160\u7b49\uff0c\u7ed9\u7a7a\u6307\u9488\u53d1\u9001\u6d88\u606f\u4e0d\u4f1a\u62a5\u9519\uff0c\u53ea\u662f\u4e0d\u54cd\u5e94\u6d88\u606f\u800c\u5df2\u3002\u5e94\u8be5\u7ed9\u91ce\u6307\u9488\u53ca\u65f6\u8d4b\u4e88\u96f6\u503c\u53d8\u6210\u6709\u6548\u7684\u7a7a\u6307\u9488\uff0c\u907f\u514d\u5185\u5b58\u62a5\u9519\u3002\n<\/p><\/blockquote>\n<p><strong>\u50f5\u5c38\u5bf9\u8c61<\/strong><\/p>\n<blockquote><p>\n\u50f5\u5c38\u5bf9\u8c61\uff1a1\u4e2a\u5df2\u7ecf\u88ab\u91ca\u653e\u7684\u5bf9\u8c61\u5c31\u53eb\u505a\u50f5\u5c38\u5bf9\u8c61\u3002\u4e00\u4e2a OC \u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u4e3a0\u88ab\u91ca\u653e\u540e\u5c31\u53d8\u6210\u50f5\u5c38\u5bf9\u8c61\u4e86\uff0c\u50f5\u5c38\u5bf9\u8c61\u7684\u5185\u5b58\u5df2\u7ecf\u88ab\u7cfb\u7edf\u56de\u6536\uff0c\u867d\u7136\u53ef\u80fd\u8be5\u5bf9\u8c61\u8fd8\u5b58\u5728\uff0c\u6570\u636e\u4f9d\u7136\u5728\u5185\u5b58\u4e2d\uff0c\u4f46\u50f5\u5c38\u5bf9\u8c61\u5df2\u7ecf\u662f\u4e0d\u7a33\u5b9a\u5bf9\u8c61\u4e86\uff0c\u4e0d\u53ef\u4ee5\u518d\u8bbf\u95ee\u6216\u8005\u4f7f\u7528\uff0c\u5b83\u7684\u5185\u5b58\u662f\u968f\u65f6\u53ef\u80fd\u88ab\u522b\u7684\u5bf9\u8c61\u7533\u8bf7\u800c\u5360\u7528\u7684\u3002\u8be5\u5bf9\u8c61\u5df2\u7ecf\u88ab\u91ca\u653e\uff0c\u4f46\u662f\u5185\u5b58\u7a7a\u95f4\u8fd8\u6ca1\u6709\u88ab\u590d\u5199\uff0c\u5f53\u524d\u5bf9\u8c61\u8fd8\u662f\u53ef\u4ee5\u8bbf\u95ee\uff0c\u4f46\u662f\u7cfb\u7edf\u5df2\u6807\u8bb0\u4e3a\u91ca\u653e\uff0c\u968f\u65f6\u6709\u53ef\u80fd\u91cd\u65b0\u88ab\u5206\u914d\u8fdb\u884c\u590d\u5199\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u8fd9\u65f6\u662f\u4e0d\u80fd\u8bbf\u95ee\u7684\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong>https:\/\/juejin.cn\/post\/6844903801267159047\n<\/p><\/blockquote>\n<p><strong>\u5176\u4ed6\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<blockquote><p>\n1.\u907f\u514d\u5faa\u73af\u5f15\u7528\uff0c\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u4e92\u76f8\u4e3a\u5bf9\u65b9\u7684\u6210\u5458\u53d8\u91cf\uff0c\u90a3\u4e48\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u4e00\u5b9a\u4e0d\u80fd\u540c\u65f6\u4e3a retain\uff0c\u5426\u5219\uff0c\u4e24\u4e2a\u5bf9\u8c61\u7684 dealloc \u51fd\u6570\u5f62\u6210\u6b7b\u9501\uff0c\u4e24\u4e2a\u5bf9\u8c61\u90fd\u65e0\u6cd5\u91ca\u653e\u3002<br \/>\n2.\u4e0d\u8981\u6ee5\u7528 autorelease\uff0c\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u5f88\u6e05\u6670\uff0c\u90a3\u6700\u597d\u5728\u7ed3\u675f\u4f7f\u7528\u540e\u9a6c\u4e0a\u8c03\u7528 release\uff0c\u8fc7\u591a\u7684\u7b49\u5f85 autorelease \u5bf9\u8c61\u4f1a\u7ed9\u5185\u5b58\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u8d1f\u62c5\u3002<br \/>\n3.\u7f16\u7801\u8fc7\u7a0b\u4e2d\u5efa\u8bae\u5c06\u5185\u5b58\u76f8\u5173\u7684\u51fd\u6570\uff0c\u5982 init\u3001dealloc\u3001viewdidload\u3001viewdidunload \u7b49\u51fd\u6570\u653e\u5728\u6700\u524d\uff0c\u8fd9\u6837\u6bd4\u8f83\u663e\u773c\uff0c\u5fd8\u8bb0\u5904\u7406\u7684\u6982\u7387\u4e5f\u4f1a\u964d\u4f4e\u3002<br \/>\n4.AutoReleasePool \u5bf9\u8c61\u5728\u91ca\u653e\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5728 iOS \u4e0b\uff0crelease \u548c drain \u6ca1\u6709\u533a\u522b\uff0c\u4f46\u4e3a\u4e86\u4e00\u81f4\u6027\u8fd8\u662f\u63a8\u8350\u4f7f\u7528 drain\u3002\n<\/p><\/blockquote>\n<p><strong>\u63d0\u95ee<\/strong><\/p>\n<ul>\n<li>\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u91ca\u653e\u524d\u88ab\u52a0\u5230\u4e86 NotificationCenter \u4e2d\uff0c\u4e0d\u5728 NotificationCenter \u4e2d remove \u8fd9\u4e2a\u5bf9\u8c61\u53ef\u80fd\u4f1a\u51fa\u73b0\u4ec0\u4e48\u95ee\u9898\uff1f<\/li>\n<\/ul>\n<blockquote><p>\n\u9996\u5148\u5bf9\u4e8e NotificationCenter \u7684\u4f7f\u7528\uff0c\u6211\u4eec\u90fd\u77e5\u9053\u53ea\u8981\u6dfb\u52a0\u5bf9\u8c61\u5230\u6d88\u606f\u4e2d\u5fc3\u8fdb\u884c\u901a\u77e5\u6ce8\u518c\uff0c\u4e4b\u540e\u5c31\u4e00\u5b9a\u8981\u5bf9\u5176 remove \u8fdb\u884c\u901a\u77e5\u6ce8\u9500\u3002\u5c06\u5bf9\u8c61\u6dfb\u52a0\u5230\u6d88\u606f\u4e2d\u5fc3\u540e\uff0c\u6d88\u606f\u4e2d\u5fc3\u53ea\u662f\u4fdd\u5b58\u8be5\u5bf9\u8c61\u7684\u5730\u5740\uff0c\u6d88\u606f\u4e2d\u5fc3\u5230\u65f6\u5019\u4f1a\u6839\u636e\u5730\u5740\u53d1\u9001\u901a\u77e5\u7ed9\u8be5\u5bf9\u8c61\uff0c\u4f46\u5e76\u6ca1\u6709\u53d6\u5f97\u8be5\u5bf9\u8c61\u7684\u5f3a\u5f15\u7528\uff0c\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4e0d\u4f1a\u52a01\u3002\u5982\u679c\u5bf9\u8c61\u91ca\u653e\u540e\u5374\u6ca1\u6709\u4ece\u6d88\u606f\u4e2d\u5fc3 remove \u6389\u8fdb\u884c\u901a\u77e5\u6ce8\u9500\uff0c\u4e5f\u5c31\u662f\u901a\u77e5\u4e2d\u5fc3\u8fd8\u4fdd\u5b58\u7740\u90a3\u4e2a\u6307\u9488\uff0c\u800c\u90a3\u4e2a\u6307\u9488\u6307\u7684\u5bf9\u8c61\u53ef\u80fd\u5df2\u7ecf\u88ab\u91ca\u653e\u9500\u6bc1\u4e86\uff0c\u90a3\u4e2a\u6307\u9488\u5c31\u6210\u4e3a\u4e00\u4e2a\u91ce\u6307\u9488\uff0c\u5f53\u901a\u77e5\u53d1\u751f\u65f6\u4f1a\u5411\u8fd9\u4e2a\u91ce\u6307\u9488\u53d1\u9001\u6d88\u606f\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u3002\n<\/p><\/blockquote>\n<ul>\n<li>\u63d0\u95ee\uff1a\u4ec0\u4e48\u662f\u5b89\u5168\u91ca\u653e\uff1f<\/li>\n<\/ul>\n<blockquote><p>\n\u91ca\u653e\u6389\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u540c\u65f6\u4e0d\u4f1a\u9020\u6210\u5185\u5b58\u6cc4\u6f0f\u6216\u6307\u9488\u60ac\u6302\u95ee\u9898\u79f0\u5176\u4e3a\u5b89\u5168\u91ca\u653e\u3002\n<\/p><\/blockquote>\n<ul>\n<li>\u63d0\u95ee\uff1a\u91ce\u6307\u9488\u662f\u4ec0\u4e48\uff0ciOS \u5f00\u53d1\u4e2d\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u6709\u91ce\u6307\u9488\uff1f<\/li>\n<\/ul>\n<blockquote><p>\n\u6307\u9488\u662f\u4e0d\u4e3a nil\uff0c\u4f46\u662f\u6307\u5411\u5df2\u7ecf\u88ab\u91ca\u653e\u7684\u5185\u5b58\u7684\u6307\u9488\u3002 __unsafe_unretain \u6216\u8005 assign \u7684\u6307\u9488\uff0c\u5bf9\u8c61\u91ca\u653e\u540e\u4f1a\u51fa\u73b0\u91ce\u6307\u9488\u3002 \u4e00\u822c\u60c5\u51b5\u4e0b OC \u4f7f\u7528\u4e86 weak \u6307\u9488\uff0c\u5728\u5bf9\u8c61\u9500\u6bc1\u65f6\u6307\u9488\u4f1a\u7f6e nil\u3002\n<\/p><\/blockquote>\n<h4>5.\u5185\u5b58\u7ba1\u7406\u539f\u5219<\/h4>\n<blockquote><p>\n\u4e00\u822c\u662f \u201c\u8c01\u521b\u5efa\uff0c\u8c01\u91ca\u653e\u201d \u7684\u539f\u5219\uff1bOC \u63d0\u4f9b\u4e86\u4e24\u79cd\u79cd\u5185\u5b58\u7ba1\u7406\u65b9\u5f0f\uff1aMRC \u624b\u52a8\u5f15\u7528\u8ba1\u6570\u5668\u548c ARC \u81ea\u52a8\u5f15\u7528\u8ba1\u6570\uff0c\u82f9\u679c\u63a8\u8350 ARC \u8fd9\u4e2a\u65b0\u6280\u672f\u6765\u7ba1\u7406\u5185\u5b58\u3002<br \/>\n<strong>\u57fa\u672c\u539f\u5219\uff1a<\/strong><br \/>\n1.\u5f53\u4f60\u901a\u8fc7 new\u3001alloc\u3001copy \u6216 mutabelCopy \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u5b83\u7684\u5f15\u7528\u8ba1\u6570\u4e3a1\uff0c\u5f53\u4e0d\u518d\u4f7f\u7528\u8be5\u5bf9\u8c61\u65f6\uff0c\u5e94\u8be5\u5411\u5bf9\u8c61\u53d1\u9001 release \u6216\u8005 autorelease \u6d88\u606f\u91ca\u653e\u5bf9\u8c61\u3002<br \/>\n2.\u5f53\u4f60\u901a\u8fc7\u5176\u4ed6\u65b9\u6cd5\u83b7\u5f97\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u5982\u679c\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u4e3a1\u4e14\u88ab\u8bbe\u7f6e\u4e3a autorelease\uff0c\u5219\u4e0d\u9700\u8981\u6267\u884c\u4efb\u4f55\u91ca\u653e\u5bf9\u8c61\u7684\u64cd\u4f5c\uff1b<br \/>\n3.\u5982\u679c\u4f60\u6253\u7b97\u53d6\u5f97\u5bf9\u8c61\u6240\u6709\u6743\uff0c\u5c31\u9700\u8981\u4fdd\u7559\u5bf9\u8c61\u5e76\u5728\u64cd\u4f5c\u5b8c\u6210\u4e4b\u540e\u91ca\u653e\uff0c\u4e14\u5fc5\u987b\u4fdd\u8bc1 retain \u548c release \u7684\u6b21\u6570\u5bf9\u7b49\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u6ce8\u610f\uff1aARC \u4e0e \u81ea\u52a8\u91ca\u653e\u6c60\u533a\u522b\uff1f<\/strong><\/li>\n<\/ul>\n<blockquote><p>\n\u533a\u522b\u5c31\u662f ARC \u4f1a\u81ea\u52a8\u4e3a\u5bf9\u8c61\u52a0\u4e0a  retain\uff0crelease\uff0c\u800c\u81ea\u52a8\u91ca\u653e\u6c60\u5c31\u662f\u628a release \u53d8\u6210 autorelease\u3002<br \/>\n1.\u5728 MRC \u4e2d\uff0c\u8c03\u7528 [obj autorelease] \u6765\u5ef6\u8fdf\u5185\u5b58\u7684\u91ca\u653e\u662f\u4e00\u4ef6\u7b80\u5355\u81ea\u7136\u7684\u4e8b\uff0c\u5728 ARC \u4e0b\u6211\u4eec\u751a\u81f3\u53ef\u4ee5\u5b8c\u5168\u4e0d\u77e5\u9053 Autorelease \u5c31\u80fd\u7ba1\u7406\u597d\u5185\u5b58\uff0c\u800c\u5728\u8fd9\u80cc\u540e objc \u548c\u7f16\u8bd1\u5668\u90fd\u5e2e\u6211\u4eec\u505a\u4e86\u5f88\u591a\u4e8b\u60c5\u3002<br \/>\n2.\u81ea\u52a8\u91ca\u653e\u6c60\u662f OC \u7684\u4e00\u79cd\u5185\u5b58\u81ea\u52a8\u56de\u6536\u673a\u5236\uff0c\u53ef\u4ee5\u5c06\u4e00\u4e9b\u4e34\u65f6\u53d8\u91cf\u901a\u8fc7\u81ea\u52a8\u91ca\u653e\u6c60\u6765\u56de\u6536\u7edf\u4e00\u91ca\u653e\uff0c\u81ea\u52a8\u91ca\u653e\u6c60\u672c\u8eab\u9500\u6bc1\u7684\u65f6\u5019\uff0c\u6c60\u5b50\u91cc\u9762\u6240\u6709\u7684\u5bf9\u8c61\u90fd\u4f1a\u505a\u4e00\u6b21 release \u64cd\u4f5c\u3002\u5b83\u53ef\u4ee5\u5ef6\u8fdf\u52a0\u5165 autoreleasepool \u4e2d\u53d8\u91cf release \u7684\u65f6\u673a\uff0c\u521b\u5efa\u7684\u53d8\u91cf\u4f1a\u5728\u8d85\u51fa\u5176\u4f5c\u7528\u57df\u7684\u65f6\u5019 release\uff0cautorelease \u672c\u8d28\u4e0a\u5c31\u662f\u5ef6\u8fdf\u8c03\u7528 release\u3002<br \/>\n3.\u5728\u6ca1\u6709\u624b\u52a8\u6dfb\u52a0 autoreleasepool \u7684\u60c5\u51b5\u4e0b\uff0cautoreleasepool \u5bf9\u8c61\u662f\u5728\u5f53\u524d\u7684 runloop \u8fed\u4ee3\u7ed3\u675f\u65f6\u91ca\u653e\u7684\uff0c\u5728\u6536\u5230\u5185\u5b58\u8b66\u544a\u65f6\u4e5f\u4f1a\u8fdb\u884c\u5185\u5b58\u91ca\u653e\uff0c\u800c\u5b83\u80fd\u591f\u91ca\u653e\u7684\u539f\u56e0\u662f\u7cfb\u7edf\u5728\u6bcf\u4e2a runloop \u8fed\u4ee3\u4e2d\u90fd\u52a0\u5165\u4e86\u81ea\u52a8\u91ca\u653e\u6c60 Push \u548c Pop (\u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u6709\u4e00\u4e2a\u9ed8\u8ba4 autoreleasepool)\u3002<br \/>\nhttps:\/\/www.jianshu.com\/p\/e69e303ba1b4<br \/>\n<strong>\u6709\u4e09\u79cd\u60c5\u51b5\u662f\u9700\u8981\u6211\u4eec\u624b\u52a8\u6dfb\u52a0 autoreleasepool \u7684\uff1a<\/strong><br \/>\n1.\u4f60\u7f16\u5199\u7684\u7a0b\u5e8f\u4e0d\u662f\u57fa\u4e8e UI \u6846\u67b6\u7684\uff0c\u6bd4\u5982\u8bf4\u547d\u4ee4\u884c\u5de5\u5177\uff1b<br \/>\n2.\u4f60\u7f16\u5199\u7684\u5faa\u73af\u4e2d\u521b\u5efa\u4e86\u5927\u91cf\u7684\u4e34\u65f6\u5bf9\u8c61\uff1b<br \/>\n3.\u4f60\u521b\u5efa\u4e86\u4e00\u4e2a\u8f85\u52a9\u7ebf\u7a0b\u3002\n<\/p><\/blockquote>\n<ul>\n<li><strong>\u8865\u5145\uff1a\u5bf9\u8c61\u662f\u4ec0\u4e48\u65f6\u5019\u88ab release \u7684\uff1f<\/strong><\/li>\n<\/ul>\n<blockquote><p>\n\u5f15\u7528\u8ba1\u6570\u4e3a0\u65f6\u88ab release\u3002autorelease \u5b9e\u9645\u4e0a\u53ea\u662f\u628a\u5bf9 release \u7684\u8c03\u7528\u5ef6\u8fdf\u4e86\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u4e2a Autorelease\uff0c\u7cfb\u7edf\u53ea\u662f\u628a\u8be5 Object \u653e\u5165\u4e86\u5f53\u524d\u7684 Autorelease pool \u4e2d\uff0c\u5f53\u8be5 pool \u88ab\u91ca\u653e\u65f6\u8be5 pool \u4e2d\u7684\u6240\u6709 Object \u4f1a\u88ab\u8c03\u7528 Release\u3002\u5bf9\u4e8e\u6bcf\u4e00\u4e2a Runloop\uff0c \u7cfb\u7edf\u4f1a\u9690\u5f0f\u521b\u5efa\u4e00\u4e2a Autorelease pool\uff0c\u8fd9\u6837\u6240\u6709\u7684 release pool \u4f1a\u6784\u6210\u4e00\u4e2a\u8c61 CallStack \u4e00\u6837\u7684\u4e00\u4e2a\u6808\u5f0f\u7ed3\u6784\uff0c\u5728\u6bcf\u4e00\u4e2a Runloop \u7ed3\u675f\u65f6\uff0c\u5f53\u524d\u6808\u9876\u7684 Autorelease pool \u4f1a\u88ab\u9500\u6bc1\uff0c\u8fd9\u6837\u8fd9\u4e2a pool \u91cc\u7684\u6bcf\u4e2a Object\uff08\u5c31\u662f autorelease \u7684\u5bf9\u8c61\uff09\u4f1a\u88ab release\u3002\u90a3\u4ec0\u4e48\u662f\u4e00\u4e2a Runloop \u5462\uff1f \u4e00\u4e2a UI \u4e8b\u4ef6\uff0cTimer call\u3001 delegate call \u90fd\u4f1a\u662f\u4e00\u4e2a\u65b0\u7684 Runloop\u3002\n<\/p><\/blockquote>\n<p>\u7591\u95ee\u5f85\u89e3\u51b3\uff1f\uff1a\u5c31\u662f\u6bd4\u5982\u521b\u5efa\u5e94\u7528\u8fd0\u884c\u7684\u65f6\u5019\u5728main\u5165\u53e3\u7684\u65f6\u5019\u5c31\u7cfb\u7edf\u521b\u5efa\u597d\u4e86\u81ea\u52a8\u91ca\u653e\u6c60\uff0c\u5728iOS\u5f00\u53d1\u4e2d\u73b0\u5728\u5c31\u81ea\u52a8\u90fd\u662f\u8bbe\u7f6e\u4e86ARC\u4e86\u3002\u90a3\u4e48\u5728\u5f00\u53d1\u4e2d\u7528\u5bf9\u8c61\u7b49\u65f6\u5019\u600e\u4e48\u4f7f\u7528\u8fd92\u8005\u7684\u6216\u8005\u4ec0\u4e48\u65f6\u5019\u7528\u7684\u54ea\u4e2a\uff1f<\/p>\n<h4>6.\u5e38\u7528\u5185\u5b58\u4fee\u9970\u8bcd<\/h4>\n<blockquote><p>\n\u5728 iOS \u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u6700\u5e38\u7528\u5230\u7684\u5c31\u662f\u90a3\u4e9b\u4fee\u9970\u5c5e\u6027\u7684\u5173\u952e\u5b57\u3002<br \/>\n\u5185\u5b58\u7ba1\u7406\u6709\u5173\u7684\u5173\u952e\u5b57\uff1astrong\u3001retain\u3001weak\u3001assign\u3001copy<br \/>\n\u7ebf\u7a0b\u5b89\u5168\u6709\u5173\u7684\u7684\u5173\u952e\u5b57\uff1anonatomic\u3001atomic<br \/>\n\u8bbf\u95ee\u6743\u9650\u6709\u5173\u7684\u7684\u5173\u952e\u5b57\uff1areadonly\u3001readwrite\uff08\u53ea\u8bfb\uff0c\u53ef\u8bfb\u5199\uff09<br \/>\n\u4fee\u9970\u53d8\u91cf\u7684\u5173\u952e\u5b57\uff1aconst\u3001static\u3001extern<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong>https:\/\/juejin.cn\/post\/6844903773131767816\n<\/p><\/blockquote>\n<p><strong>\u5185\u5b58\u7ba1\u7406\u6709\u5173\u7684\u5173\u952e\u5b57<\/strong><\/p>\n<ul>\n<li>stronng\uff1a<\/li>\n<\/ul>\n<blockquote><p>\n\u7528\u4e8e\u4fee\u9970\u4e00\u4e9b OC \u5bf9\u8c61\u7c7b\u578b\u7684\u6570\u636e\uff0c\u6bd4\u5982\uff1aNSNumber\u3001NSString\u3001NSArray\u3001NSDate\u3001NSDictionary\u3001\u6a21\u578b\u7c7b\u7b49\uff0c\u5b83\u88ab\u4e00\u4e2a\u5f3a\u6307\u9488\u5f15\u7528\u7740\uff0c\u662f\u4e00\u4e2a\u5f3a\u5f15\u7528\uff0c\u6307\u5411\u5bf9\u8c61\u5185\u5b58\u5730\u5740\uff0c\u5185\u5b58\u8ba1\u6570+1\u3002\u5728 ARC \u73af\u5883\u4e0b\u7b49\u540c\u4e8e retain\uff0c\u8fd9\u4e00\u70b9\u533a\u522b\u4e8e weak\u3002\u5b83\u662f\u4e00\u6211\u4eec\u901a\u5e38\u6240\u8bf4\u7684\u6307\u9488\u62f7\u8d1d\uff08\u6d45\u62f7\u8d1d\uff09\uff0c\u5185\u5b58\u5730\u5740\u4fdd\u6301\u4e0d\u53d8\uff0c\u53ea\u662f\u751f\u6210\u4e86\u4e00\u4e2a\u65b0\u7684\u6307\u9488\uff0c\u65b0\u6307\u9488\u548c\u5f15\u7528\u5bf9\u8c61\u7684\u6307\u9488\u6307\u5411\u540c\u4e00\u4e2a\u5185\u5b58\u5730\u5740\uff0c\u6ca1\u6709\u751f\u6210\u65b0\u7684\u5bf9\u8c61\uff0c\u53ea\u662f\u591a\u4e86\u4e00\u4e2a\u6307\u5411\u8be5\u5bf9\u8c61\u7684\u6307\u9488\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>\u7531\u4e8e\u4f7f\u7528\u7684\u662f\u4e00\u4e2a\u5185\u5b58\u5730\u5740\uff0c\u5f53\u8be5\u5185\u5b58\u5730\u5740\u5b58\u50a8\u7684\u5185\u5bb9\u53d1\u751f\u53d8\u66f4\u7684\u65f6\u5019\uff0c\u4f1a\u5bfc\u81f4\u5c5e\u6027\u4e5f\u8ddf\u7740\u53d8\u66f4\u3002\n<\/p><\/blockquote>\n<ul>\n<li>retain\uff1a<\/li>\n<\/ul>\n<blockquote><p>\n\u8868\u793a\u6301\u6709\u7279\u6027\uff0csetter \u65b9\u6cd5\u5c06\u4f20\u5165\u53c2\u6570\u5148\u4fdd\u7559\u518d\u8d4b\u503c\uff0c\u4f20\u5165\u53c2\u6570\u7684 retaincount \u4f1a+1\u3002\u4f7f\u7528 retain \u4f1a\u5bf9\u5185\u5b58\u7684\u5f15\u7528\u8ba1\u6570\u8fdb\u884c\u64cd\u4f5c\u4ee5\u4fdd\u8bc1\u6301\u6709\u7684\u5bf9\u8c61\u4e0d\u4f1a\u88ab\u56de\u6536\uff0cretain\uff1asetter \u65b9\u6cd5\u5bf9\u53c2\u6570\u8fdb\u884c release \u65e7\u503c\uff0c\u518d retain \u65b0\u503c\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>retain \u548c strong \u533a\u522b\uff1a\u4f5c\u7528\u662f\u4e00\u6837\u7684\uff0c\u53ea\u662f\u5199\u6cd5\u4e0a\u7684\u533a\u522b\u3002\u5728\u975e ARC \u673a\u5236\u65f6\u662f\u7528 retain \u5173\u952e\u5b57\u4fee\u9970\uff1b\u5728 ARC \u673a\u5236\u540e\u4e00\u822c\u90fd\u7528 strong \u5173\u952e\u5b57\u6765\u4ee3\u66ff retain \u4e86\u3002\n<\/p><\/blockquote>\n<ul>\n<li>release<\/li>\n<\/ul>\n<blockquote><p>\n\u4e0e retain \u914d\u5bf9\u4f7f\u7528\u7684\u65b9\u6cd5\u662f release\uff0c\u56e0\u4e3a retain \u662f\u5c06\u5185\u5b58\u7684\u5f15\u7528\u8ba1\u6570\u52a0\u4e00\u5373\u5bf9\u5bf9\u8c61\u8fdb\u884c\u4e00\u6b21\u6301\u6709\uff0crelease \u662f\u5c06\u5185\u5b58\u7684\u5f15\u7528\u8ba1\u6570\u51cf\u4e00\u5373\u7ed3\u675f\u5bf9\u5bf9\u8c61\u7684\u6301\u6709\u3002\n<\/p><\/blockquote>\n<ul>\n<li>copy<\/li>\n<\/ul>\n<blockquote><p>\n\u540c\u6837\u7528\u4e8e\u4fee\u9970 OC \u5bf9\u8c61\u7c7b\u578b\u7684\u6570\u636e\uff0c\u540c\u65f6\u5728 MRC \u65f6\u671f\u7528\u6765\u4fee\u9970 block\uff0c\u56e0\u4e3a block \u9700\u8981\u4ece\u6808\u533a copy \u5230\u5806\u533a\uff0c\u5728\u73b0\u5728\u7684 ARC \u65f6\u4ee3\uff0c\u7cfb\u7edf\u81ea\u52a8\u7ed9\u6211\u4eec\u505a\u4e86\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u6240\u4ee5\u73b0\u5728\u4f7f\u7528 strong \u6216\u8005 copy \u6765\u4fee\u9970 block \u90fd\u662f\u53ef\u4ee5\u7684\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong><br \/>\n1.copy \u548c strong \u76f8\u540c\u70b9\u5728\u4e8e\u90fd\u662f\u5c5e\u4e8e\u5f3a\u5f15\u7528\uff0c\u90fd\u4f1a\u662f\u5c5e\u6027\u7684\u8ba1\u6570\u52a01\u3002<br \/>\n2.copy \u548c strong \u4e0d\u540c\u70b9\u5728\u4e8e\uff0c\u5b83\u6240\u4fee\u9970\u7684\u5c5e\u6027\u5f53\u5f15\u7528\u4e00\u4e2a\u5c5e\u6027\u503c\u65f6\uff0c\u662f\u5185\u5b58\u62f7\u8d1d\uff08\u6df1\u62f7\u8d1d\uff09\uff0c\u5c31\u662f\u5728\u5f15\u7528\u65f6\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u5185\u5b58\u5730\u5740\u548c\u6307\u9488\u5730\u5740\u6765\uff0c\u548c\u5f15\u7528\u5bf9\u8c61\u5b8c\u5168\u6ca1\u6709\u76f8\u540c\u70b9\uff0c\u56e0\u6b64\u5b83\u4e0d\u4f1a\u56e0\u4e3a\u5f15\u7528\u5c5e\u6027\u7684\u53d8\u66f4\u800c\u6539\u53d8\u3002<br \/>\n3.copy \u5728\u4fee\u9970 Mutable \u53ef\u53d8\u7c7b\u578b\u4f1a\u5728\u5185\u5b58\u91cc\u62f7\u8d1d\u4e00\u4efd\u5bf9\u8c61\uff0c\u4e24\u4e2a\u6307\u9488\u6307\u5411\u4e0d\u540c\u7684\u5185\u5b58\u5730\u5740\uff0ccopy \u51fa\u6765\u7684\u65b0\u5bf9\u8c61\u662f\u4e0d\u53ef\u53d8\u7c7b\u578b\u7684\u3002\u800c\u4fee\u9970 NSString\u3001NSArray \u7b49\u666e\u901a\u7c7b\u578b\u5145\u5f53 strong \u4f7f\u7528\uff0c\u5185\u5b58\u8ba1\u6570+1\u3002\u5177\u4f53\u7684\u6df1\u6d45\u62f7\u8d1d\u60c5\u51b5\u89e3\u6790\u770b\u62f7\u8d1d\u4e13\u8bb2\u3002<br \/>\n<strong>\u4e3e\u4f8b\uff1a<\/strong>\u7528 @property \u58f0\u660e\u7684 NSString\uff08\u6216NSArray\uff0cNSDictionary\uff09\u7ecf\u5e38\u4f7f\u7528 copy \u5173\u952e\u5b57\uff0c\u4e3a\u4ec0\u4e48\uff1f\u5982\u679c\u6539\u7528 strong \u5173\u952e\u5b57\uff0c\u53ef\u80fd\u9020\u6210\u4ec0\u4e48\u95ee\u9898\uff1f<br \/>\nhttps:\/\/blog.csdn.net\/weixin_33725515\/article\/details\/88027657\n<\/p><\/blockquote>\n<ul>\n<li>retain\u3001strong\u3001copy \u533a\u522b<\/li>\n<\/ul>\n<blockquote><p>\nhttps:\/\/blog.csdn.net\/qiushisoftware\/article\/details\/102647011<br \/>\nhttps:\/\/www.cnblogs.com\/fengmin\/p\/5390073.html\n<\/p><\/blockquote>\n<ul>\n<li>weak\uff1a<\/li>\n<\/ul>\n<blockquote><p>\n\u540c\u6837\u7ecf\u5e38\u7528\u4e8e\u4fee\u9970 OC \u5bf9\u8c61\u7c7b\u578b\u7684\u6570\u636e\uff0c\u4fee\u9970\u7684\u5bf9\u8c61\u5728\u91ca\u653e\u540e\u6307\u9488\u5730\u5740\u4f1a\u81ea\u52a8\u88ab\u7f6e\u4e3a nil\uff0c\u8fd9\u662f\u4e00\u79cd\u5f31\u5f15\u7528\u3002\u66f4\u4e3a\u5177\u4f53\u7684\u89e3\u6790\u770b weak \u4e13\u8bb2\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>\u5728 ARC \u73af\u5883\u4e0b\uff0c\u4e3a\u907f\u514d\u5faa\u73af\u5f15\u7528\uff0c\u5f80\u5f80\u4f1a\u628a delegate \u5c5e\u6027\u7528 weak \u4fee\u9970\uff1b\u5728 MRC \u4e0b\u4f7f\u7528 assign \u4fee\u9970\u3002\u5f53\u4e00\u4e2a\u5bf9\u8c61\u4e0d\u518d\u6709 strong \u7c7b\u578b\u7684\u6307\u9488\u6307\u5411\u5b83\u7684\u65f6\u5019\uff0c\u5b83\u5c31\u4f1a\u88ab\u91ca\u653e\uff0c\u5373\u4f7f\u8fd8\u6709 weak \u578b\u6307\u9488\u6307\u5411\u5b83\uff0c\u90a3\u4e48\u8fd9\u4e9b weak \u578b\u6307\u9488\u4e5f\u5c06\u88ab\u6e05\u9664\u3002\n<\/p><\/blockquote>\n<ul>\n<li>assign\uff1a<\/li>\n<\/ul>\n<blockquote><p>\n\u7ecf\u5e38\u7528\u4e8e\u975e\u6307\u9488\u53d8\u91cf\uff0c\u7528\u4e8e\u57fa\u7840\u6570\u636e\u7c7b\u578b \uff08\u4f8b\u5982 NSInteger\uff09\u548c C \u6570\u636e\u7c7b\u578b\uff08int\u3001float\u3001double\u3001char \u7b49\uff09\uff0c\u53e6\u5916\u8fd8\u6709 id \u7c7b\u578b\u3002\u7528\u4e8e\u5bf9\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u590d\u5236\u64cd\u4f5c\uff0c\u4e0d\u66f4\u6539\u5f15\u7528\u8ba1\u6570\u3002\u4e5f\u53ef\u4ee5\u7528\u6765\u4fee\u9970\u5bf9\u8c61\uff0c\u4f46\u662f\u88ab assign \u4fee\u9970\u7684\u5bf9\u8c61\u5728\u91ca\u653e\u540e\uff0c\u6307\u9488\u7684\u5730\u5740\u8fd8\u662f\u5b58\u5728\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u6307\u9488\u5e76\u6ca1\u6709\u88ab\u7f6e\u4e3a nil\uff0c\u6210\u4e3a\u91ce\u6307\u9488\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong><br \/>\n1.\u4e4b\u6240\u4ee5\u53ef\u4ee5\u4fee\u9970\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u56e0\u4e3a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e00\u822c\u5206\u914d\u5728\u6808\u4e0a\uff0c\u6808\u7684\u5185\u5b58\u4f1a\u7531\u7cfb\u7edf\u81ea\u52a8\u5904\u7406\uff0c\u4e0d\u4f1a\u9020\u6210\u91ce\u6307\u9488\u3002<br \/>\n2.\u5728 MRC \u4e0b\u5e38\u89c1\u7684 id delegate \u5f80\u5f80\u662f\u7528 assign \u65b9\u5f0f\u7684\u5c5e\u6027\u800c\u4e0d\u662f retain \u65b9\u5f0f\u7684\u5c5e\u6027\uff0c\u4e3a\u4e86\u9632\u6b62 delegation \u4e24\u7aef\u4ea7\u751f\u4e0d\u5fc5\u8981\u7684\u5faa\u73af\u5f15\u7528\u3002\u4f8b\u5982\uff1a\u5bf9\u8c61 A \u901a\u8fc7 retain \u83b7\u53d6\u4e86\u5bf9\u8c61 B \u7684\u6240\u6709\u6743\uff0c\u8fd9\u4e2a\u5bf9\u8c61 B \u7684 delegate \u53c8\u662f A\uff0c \u5982\u679c\u8fd9\u4e2a delegate \u662f retain \u65b9\u5f0f\uff0c\u4e24\u4e2a\u90fd\u662f\u5f3a\u5f15\u7528\uff0c\u4e92\u76f8\u6301\u6709\uff0c\u90a3\u57fa\u672c\u4e0a\u5c31\u6ca1\u6709\u673a\u4f1a\u91ca\u653e\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u4e86\u3002\n<\/p><\/blockquote>\n<ul>\n<li>weak \u548c assign \u7684\u533a\u522b\uff1a<\/li>\n<\/ul>\n<blockquote><p>\n1.\u4fee\u9970\u7684\u5bf9\u8c61\uff1aweak \u4fee\u9970 OC \u5bf9\u8c61\u7c7b\u578b\u7684\u6570\u636e\uff0cassign \u7528\u6765\u4fee\u9970\u662f\u975e\u6307\u9488\u53d8\u91cf\u3002<br \/>\n2.\u5f15\u7528\u8ba1\u6570\uff1aweak \u548c assign \u90fd\u4e0d\u4f1a\u589e\u52a0\u5f15\u7528\u8ba1\u6570\u3002<br \/>\n3.\u91ca\u653e\uff1aweak \u4fee\u9970\u7684\u5bf9\u8c61\u91ca\u653e\u540e\u6307\u9488\u5730\u5740\u81ea\u52a8\u8bbe\u7f6e\u4e3a nil\uff0cassign \u4fee\u9970\u7684\u5bf9\u8c61\u91ca\u653e\u540e\u6307\u9488\u5730\u5740\u4f9d\u7136\u5b58\u5728\uff0c\u6210\u4e3a\u91ce\u6307\u9488\u3002<br \/>\n4.\u4fee\u9970 delegate \u5728 MRC \u4f7f\u7528 assign\uff0c\u5728 ARC \u4f7f\u7528 weak\u3002\n<\/p><\/blockquote>\n<ul>\n<li>unsafe_unretained<\/li>\n<\/ul>\n<blockquote><p>\nunsafe_unretained \u7c7b\u578b\u6307\u9488\u6307\u5411\u4e00\u5757\u5185\u5b58\u65f6\uff0c\u5185\u5b58\u7684\u5f15\u7528\u8ba1\u6570\u4e5f\u4e0d\u4f1a\u589e\u52a0\uff0c\u8fd9\u4e00\u70b9\u4e0e weak \u4e00\u81f4\u3002\u4f46\u662f\u4e0e weak \u7c7b\u578b\u4e0d\u540c\u7684\u662f\uff0c\u5f53\u5176\u6240\u6307\u5411\u7684\u5185\u5b58\u88ab\u9500\u6bc1\u65f6\uff08\u5bf9\u8c61\u88ab\u9500\u6bc1\uff09\uff0cunsafe_unretained \u7c7b\u578b\u7684\u6307\u9488\u5e76\u4e0d\u4f1a\u88ab\u8d4b\u503c\u4e3a nil\uff0c\u4e5f\u5c31\u662f\u53d8\u6210\u4e86\u4e00\u4e2a\u91ce\u6307\u9488\u3002\u5bf9\u91ce\u6307\u9488\u6307\u5411\u7684\u5185\u5b58\u8fdb\u884c\u8bfb\u5199\uff0c\u7a0b\u5e8f\u5c31\u4f1a crash\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>\u5f53\u58f0\u660e\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\u65f6\uff0c\u4f7f\u7528\u65b9\u5f0f\u6709\u70b9\u533a\u522b\uff0c\u8981\u5728\u5173\u952e\u8bcd\u524d\u9762\u52a0\u53cc\u4e0b\u5212\u7ebf__\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong>https:\/\/www.jianshu.com\/p\/bd6aa1e62717\n<\/p><\/blockquote>\n<p><strong>\u7ebf\u7a0b\u5b89\u5168\u6709\u5173\u7684\u7684\u5173\u952e\u5b57<\/strong><\/p>\n<ul>\n<li>nonatomic<\/li>\n<\/ul>\n<blockquote><p>\nnonatomic \u975e\u539f\u5b50\u64cd\u4f5c\uff1a\u4e0d\u52a0\u9501\uff0c\u7ebf\u7a0b\u6267\u884c\u5feb\uff0c\u4f46\u662f\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u540c\u4e00\u4e2a\u5c5e\u6027\u65f6\u7ed3\u679c\u65e0\u6cd5\u9884\u6599\u3002\u4e5f\u5c31\u662f\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u6027\u80fd\u9ad8\uff0c\u4f46\u662f\u8bbf\u95ee\u4e0d\u5b89\u5168\u3002\n<\/p><\/blockquote>\n<ul>\n<li>atomic<\/li>\n<\/ul>\n<blockquote><p>\natomic \u539f\u5b50\u64cd\u4f5c\uff1a\u52a0\u9501\uff0c\u4fdd\u8bc1 getter \u548c setter \u5b58\u53d6\u65b9\u6cd5\u7684\u7ebf\u7a0b\u5b89\u5168\uff08\u4ec5\u5bf9 setter \u548c getter \u65b9\u6cd5\u52a0\u9501\uff09\u3002 \u56e0\u4e3a\u7ebf\u7a0b\u52a0\u9501\u7684\u539f\u56e0\uff0c\u5728\u522b\u7684\u7ebf\u7a0b\u6765\u8bfb\u5199\u8fd9\u4e2a\u5c5e\u6027\u4e4b\u524d\u4f1a\u5148\u6267\u884c\u5b8c\u5f53\u524d\u7684\u64cd\u4f5c\u3002<br \/>\n\u4f8b\u5982\uff1a\u7ebf\u7a0b A \u8c03\u7528\u4e86\u67d0\u4e00\u5c5e\u6027\u7684 setter \u65b9\u6cd5\uff0c\u5728\u65b9\u6cd5\u8fd8\u672a\u5b8c\u6210\u7684\u60c5\u51b5\u4e0b\uff0c\u7ebf\u7a0b B \u8c03\u7528\u4e86\u8be5\u5c5e\u6027\u7684 getter \u65b9\u6cd5\uff0c\u90a3\u4e48\u53ea\u6709\u5728\u6267\u884c\u5b8c A \u7ebf\u7a0b\u7684 setter \u65b9\u6cd5\u4ee5\u540e\u624d\u6267\u884c B \u7ebf\u7a0b\u7684 getter \u64cd\u4f5c\u3002\u5f53\u51e0\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8c03\u7528\u540c\u4e00\u5c5e\u6027\u7684 setter \u548c getter\u65b9\u6cd5\u65f6\u4f1a\u5f97\u5230\u4e00\u4e2a\u5408\u6cd5\u7684\u503c\uff0c\u4f46\u662f get \u7684\u503c\u4e0d\u53ef\u63a7\uff08\u56e0\u4e3a\u7ebf\u7a0b\u6267\u884c\u7684\u987a\u5e8f\u4e0d\u786e\u5b9a\uff09\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>atomic \u53ea\u9488\u5bf9\u5c5e\u6027\u7684 getter\/setter \u65b9\u6cd5\u8fdb\u884c\u52a0\u9501\uff0c\u6240\u4ee5\u5b89\u5168\u53ea\u662f\u9488\u5bf9 getter\/setter \u65b9\u6cd5\u6765\u8bf4\uff0c\u5e76\u4e0d\u662f\u6574\u4e2a\u7ebf\u7a0b\u5b89\u5168\uff0c\u56e0\u4e3a\u4e00\u4e2a\u5c5e\u6027\u5e76\u4e0d\u53ea\u6709<br \/>\ngetter\/setter \u65b9\u6cd5\u3002\u4e3e\u4f8b\uff1a\u5982\u679c\u4e00\u4e2a\u7ebf\u7a0b\u6b63\u5728 getter \u6216\u8005 setter \u65f6\uff0c\u6709\u53e6\u5916\u4e00\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5bf9\u8be5\u5c5e\u6027\u8fdb\u884c release \u64cd\u4f5c\uff0c\u5982\u679c release \u5148\u5b8c\u6210\u4f1a\u9020\u6210 crash\u3002\n<\/p><\/blockquote>\n<p><strong>\u8bbf\u95ee\u6743\u9650\u6709\u5173\u7684\u7684\u5173\u952e\u5b57<\/strong><\/p>\n<ul>\n<li>readonly<\/li>\n<\/ul>\n<blockquote><p>\n\u8fd9\u4e2a\u5c5e\u6027\u53d8\u91cf\u5c31\u662f\u8868\u660e\u53d8\u91cf\u53ea\u6709\u53ef\u8bfb\u65b9\u6cd5\uff0c\u4e5f\u5c31\u662f\u8bf4\u4f60\u53ea\u80fd\u4f7f\u7528\u5b83\u7684 get \u65b9\u6cd5\u3002\u56e0\u4e3a\u4ed6\u53ea\u751f\u6210 getter \u65b9\u6cd5\u800c\u4e0d\u751f\u6210 setter\u65b9\u6cd5\uff08getter \u65b9\u6cd5\u6ca1\u6709 get \u524d\u7f00\uff09\u3002\n<\/p><\/blockquote>\n<ul>\n<li>readwrite<\/li>\n<\/ul>\n<blockquote><p>\n\u8fd9\u4e2a\u5c5e\u6027\u662f\u53d8\u91cf\u7684\u9ed8\u8ba4\u5c5e\u6027\uff0c\u5c31\u662f\u5982\u679c\u4f60 readwrite and readonly \u90fd\u6ca1\u6709\u4f7f\u7528\uff0c\u90a3\u4e48\u4f60\u7684\u53d8\u91cf\u5c31\u662f readwrite \u5c5e\u6027\uff0c\u901a\u8fc7\u52a0\u5165 readwrite \u5c5e\u6027\u4f60\u7684\u53d8\u91cf\u5c31\u4f1a\u6709 get \u548c set \u65b9\u6cd5\u3002\u5b83\u662f\u53ef\u8bfb\u53ef\u5199\u7279\u6027\uff0c\u4f1a\u751f\u6210\u4e0d\u5e26\u989d\u5916\u53c2\u6570\u7684 getter \u548c setter \u65b9\u6cd5\uff08setter \u65b9\u6cd5\u53ea\u6709\u4e00\u4e2a\u53c2\u6570\uff09\u3002\n<\/p><\/blockquote>\n<p><strong>\u4fee\u9970\u53d8\u91cf\u7684\u5173\u952e\u5b57<\/strong><\/p>\n<blockquote><p>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong><br \/>\nhttps:\/\/www.jianshu.com\/p\/2fd58ed2cf55<br \/>\n\u7b14\u8bb017\u7b2c11\u70b9\uff1ahttps:\/\/www.jianshu.com\/p\/b619c4286d26\n<\/p><\/blockquote>\n<ul>\n<li>const<\/li>\n<\/ul>\n<blockquote><p>\n\u5e38\u91cf\u4fee\u9970\u7b26\uff0c\u8868\u793a\u4e0d\u53ef\u53d8\u3002\u53ef\u4ee5\u7528\u6765\u4fee\u9970\u53f3\u8fb9\u7684\u57fa\u672c\u53d8\u91cf\u548c\u6307\u9488\u53d8\u91cf\uff0c\u653e\u5728\u8c01\u7684\u524d\u9762\u4fee\u9970\u8c01\uff08\u57fa\u672c\u6570\u636e\u53d8\u91cf p\uff0c\u6307\u9488\u53d8\u91cf *p\uff09\u3002<br \/>\n<strong>\u5e38\u7528\u5199\u6cd5\u4f8b\u5982\uff1a<\/strong><br \/>\n1.const \u7c7b\u578b * \u53d8\u91cf\u540d a<br \/>\n\u53ef\u4ee5\u6539\u53d8\u6307\u9488\u7684\u6307\u5411\uff0c\u4e0d\u80fd\u6539\u53d8\u6307\u9488\u6307\u5411\u7684\u5185\u5bb9\u3002 const \u653e\u524d\u9762\u7ea6\u675f\u53c2\u6570\uff0c\u8868\u793a *a \u53ea\u8bfb\uff0c\u53ea\u80fd\u4fee\u6539\u5730\u5740 a\uff0c\u4e0d\u80fd\u901a\u8fc7 a \u4fee\u6539\u8bbf\u95ee\u7684\u5185\u5b58\u7a7a\u95f4\u3002<br \/>\n2.\u7c7b\u578b * const \u53d8\u91cf\u540d<br \/>\n\u53ef\u4ee5\u6539\u53d8\u6307\u9488\u6307\u5411\u7684\u5185\u5bb9\uff0c\u4e0d\u80fd\u6539\u53d8\u6307\u9488\u7684\u6307\u5411\u3002 const \u653e\u540e\u9762\u7ea6\u675f\u53c2\u6570\uff0c\u8868\u793a a \u53ea\u8bfb\uff0c\u4e0d\u80fd\u4fee\u6539 a \u7684\u5730\u5740\uff0c\u53ea\u80fd\u4fee\u6539 a \u8bbf\u95ee\u7684\u503c\uff0c\u4e0d\u80fd\u4fee\u6539\u53c2\u6570\u7684\u5730\u5740\u3002\n<\/p><\/blockquote>\n<ul>\n<li>\u5e38\u91cf\uff08const\uff09\u548c\u5b8f\u5b9a\u4e49\uff08define\uff09\u7684\u533a\u522b\uff1a<\/li>\n<\/ul>\n<blockquote><p>\n\u4f7f\u7528\u5b8f\u548c\u5e38\u91cf\u6240\u5360\u7528\u7684\u5185\u5b58\u5dee\u522b\u4e0d\u5927\uff0c\u5b8f\u5b9a\u4e49\u7684\u662f\u5e38\u91cf\uff0c\u5e38\u91cf\u90fd\u653e\u5728\u5e38\u91cf\u533a\uff0c\u53ea\u4f1a\u751f\u6210\u4e00\u4efd\u5185\u5b58\u3002<br \/>\n1.\u7f16\u8bd1\u65f6\u523b\uff1a\u5b8f\u662f\u9884\u7f16\u8bd1\uff08\u7f16\u8bd1\u4e4b\u524d\u5904\u7406\uff09\uff0cconst \u662f\u7f16\u8bd1\u9636\u6bb5\u3002\u5bfc\u81f4\u4f7f\u7528\u5b8f\u5b9a\u4e49\u8fc7\u591a\u7684\u8bdd\uff0c\u968f\u7740\u5de5\u7a0b\u8d8a\u6765\u8d8a\u5927\uff0c\u7f16\u8bd1\u901f\u5ea6\u4f1a\u8d8a\u6765\u8d8a\u6162\u3002<br \/>\n2.\u5b8f\u4e0d\u505a\u68c0\u67e5\uff0c\u4e0d\u4f1a\u62a5\u7f16\u8bd1\u9519\u8bef\uff0c\u53ea\u662f\u66ff\u6362\uff0cconst \u4f1a\u7f16\u8bd1\u68c0\u67e5\uff0c\u4f1a\u62a5\u7f16\u8bd1\u9519\u8bef\u3002<br \/>\n3.\u5b8f\u80fd\u5b9a\u4e49\u4e00\u4e9b\u51fd\u6570\u548c\u65b9\u6cd5\uff0c const \u4e0d\u80fd\u3002\n<\/p><\/blockquote>\n<ul>\n<li>static<\/li>\n<\/ul>\n<blockquote><p>\n\u5b9a\u4e49\u6240\u4fee\u9970\u7684\u5bf9\u8c61\u53ea\u80fd\u5728\u5f53\u524d\u6587\u4ef6\u8bbf\u95ee\uff0c\u4e0d\u80fd\u901a\u8fc7 extern \u6765\u5f15\u7528\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u7684\u5168\u5c40\u53d8\u91cf\u4f5c\u7528\u57df\u662f\u6574\u4e2a\u7a0b\u5e8f\uff08\u53ef\u4ee5\u901a\u8fc7 extern \u6765\u5f15\u7528\uff09\uff0c\u88ab static \u4fee\u9970\u540e\u4ec5\u9650\u4e8e\u5f53\u524d\u6587\u4ef6\u6765\u5f15\u7528\uff0c\u5176\u4ed6\u6587\u4ef6\u4e0d\u80fd\u901a\u8fc7 extern \u6765\u5f15\u7528\u3002<br \/>\n<strong>\u4fee\u9970\u5c40\u90e8\u53d8\u91cf\uff1a<\/strong><br \/>\n1.\u6709\u65f6\u5e0c\u671b\u51fd\u6570\u4e2d\u7684\u5c40\u90e8\u53d8\u91cf\u7684\u503c\u5728\u51fd\u6570\u8c03\u7528\u7ed3\u675f\u540e\u4e0d\u6d88\u5931\u800c\u7ee7\u7eed\u4fdd\u7559\u539f\u503c\uff0c\u5373\u5176\u5360\u7528\u7684\u5b58\u50a8\u5355\u5143\u4e0d\u91ca\u653e\uff0c\u5728\u4e0b\u4e00\u6b21\u518d\u8c03\u7528\u7684\u65f6\u5019\u8be5\u53d8\u91cf\u5df2\u7ecf\u6709\u503c\u3002\u8fd9\u65f6\u5c31\u5e94\u8be5\u6307\u5b9a\u8be5\u5c40\u90e8\u53d8\u91cf\u4e3a\u9759\u6001\u53d8\u91cf\uff0c\u7528\u5173\u952e\u5b57 static \u8fdb\u884c\u58f0\u660e\u3002<br \/>\n2.\u5ef6\u957f\u5c40\u90e8\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f\uff08\u6ca1\u6709\u6539\u53d8\u53d8\u91cf\u7684\u4f5c\u7528\u57df\uff0c\u53ea\u5728\u5f53\u524d\u4f5c\u7528\u57df\u6709\u7528\uff09\uff0c\u7a0b\u5e8f\u7ed3\u675f\u624d\u4f1a\u9500\u6bc1\u3002<br \/>\n3.\u5c40\u90e8\u53d8\u91cf\u53ea\u4f1a\u751f\u6210\u4e00\u4efd\u5185\u5b58\uff0c\u53ea\u4f1a\u521d\u59cb\u5316\u4e00\u6b21\u3002\u628a\u5b83\u5206\u914d\u5728\u9759\u6001\u5b58\u50a8\u533a\uff0c\u8be5\u53d8\u91cf\u5728\u6574\u4e2a\u7a0b\u5e8f\u6267\u884c\u671f\u95f4\u4e0d\u91ca\u653e\uff0c\u5176\u6240\u5206\u914d\u7684\u7a7a\u95f4\u59cb\u7ec8\u5b58\u5728\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>\u5f53\u5728\u5bf9\u8c61 A \u91cc\u8fd9\u4e48\u5199 static int i = 10; \u5f53 A \u9500\u6bc1\u6389\u4e4b\u540e\uff0c\u8fd9\u4e2a i \u8fd8\u5b58\u5728\u3002\u5f53\u6211\u518d\u6b21 alloc init \u4e00\u4e2a A \u7684\u5bf9\u8c61\u4e4b\u540e\uff0c\u5728\u65b0\u5bf9\u8c61\u91cc\u4f9d\u7136\u53ef\u4ee5\u62ff\u5230 i = 90\uff0c\u9664\u975e\u6740\u6b7b\u7a0b\u5e8f\u518d\u6b21\u8fdb\u5165\u624d\u80fd\u5f97\u5230 i = 0\u3002<br \/>\n<strong>\u4fee\u9970\u5168\u5c40\u53d8\u91cf\uff1a<\/strong><br \/>\n1.\u53ea\u80fd\u5728\u672c\u6587\u4ef6\u4e2d\u8bbf\u95ee\uff0c\u4fee\u6539\u5168\u5c40\u53d8\u91cf\u7684\u4f5c\u7528\u57df\uff0c\u751f\u547d\u5468\u671f\u4e0d\u4f1a\u6539\u3002<br \/>\n2.\u907f\u514d\u91cd\u590d\u5b9a\u4e49\u5168\u5c40\u53d8\u91cf\uff08\u5355\u4f8b\u6a21\u5f0f\uff09\u3002\n<\/p><\/blockquote>\n<ul>\n<li>extern<\/li>\n<\/ul>\n<blockquote><p>\n\u53ea\u662f\u7528\u6765\u83b7\u53d6\u5168\u5c40\u53d8\u91cf\uff08\u5305\u62ec\u5168\u5c40\u9759\u6001\u53d8\u91cf\uff09\u7684\u503c\uff0c\u4e0d\u80fd\u7528\u4e8e\u5b9a\u4e49\u53d8\u91cf\u3002\u5148\u5728\u5f53\u524d\u6587\u4ef6\u67e5\u627e\u6709\u6ca1\u6709\u5168\u5c40\u53d8\u91cf\uff0c\u6ca1\u6709\u627e\u5230\u624d\u4f1a\u53bb\u5176\u4ed6\u6587\u4ef6\u67e5\u627e\uff08\u4f18\u5148\u7ea7\uff09\u3002\n<\/p><\/blockquote>\n<ul>\n<li>const\u3001static\u3001extern \u7ec4\u5408\u4f7f\u7528<\/li>\n<\/ul>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 429px;\">\n<div class=\"image-view\" data-width=\"950\" data-height=\"429\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-797028de3a33d8682f471e0d61b1860f.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">static\u4e0econst\u8054\u5408\u4f7f\u7528<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 447px;\">\n<div class=\"image-view\" data-width=\"963\" data-height=\"447\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-86a33fffff381110fe21fdfcaf665d5e.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">extern\u4e0econst\u8054\u5408\u4f7f\u7528<\/div>\n<\/div>\n<p><strong>@property\u3001@synthesize\u3001@dynamic<\/strong><\/p>\n<blockquote><p>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong><br \/>\nhttps:\/\/www.jianshu.com\/p\/490424151e31<br \/>\nhttps:\/\/www.ngui.cc\/el\/1176329.html?action=onClick\n<\/p><\/blockquote>\n<ul>\n<li>@Property<\/li>\n<\/ul>\n<blockquote><p>\n1.\u5c5e\u6027\uff08property\uff09\u662f Objective-C \u7684\u4e00\u9879\u7279\u6027\uff0c\u7528\u4e8e\u5c01\u88c5\u5bf9\u8c61\u4e2d\u7684\u6570\u636e\u3002\u8fd9\u4e00\u7279\u6027\u53ef\u4ee5\u4ee4\u7f16\u8bd1\u5668\u81ea\u52a8\u7f16\u5199\u4e0e\u5c5e\u6027\u76f8\u5173\u7684\u5b58\u53d6\u65b9\u6cd5\uff0c\u5e76\u4e14\u4fdd\u5b58\u4e3a\u5404\u79cd\u5b9e\u4f8b\u53d8\u91cf\u3002<br \/>\n2.\u5c5e\u6027\u7684\u672c\u8d28\u662f\u5b9e\u4f8b\u53d8\u91cf\u4e0e\u5b58\u53d6\u65b9\u6cd5\u7684\u7ed3\u5408\uff0c@property = ivar + getter + setter<br \/>\n3.@property \u4f1a\u4f7f\u7f16\u8bd1\u5668\u81ea\u52a8\u7f16\u5199\u8bbf\u95ee\u8fd9\u4e9b\u5c5e\u6027\u6240\u9700\u7684\u65b9\u6cd5\uff0c\u6b64\u8fc7\u7a0b\u5728\u7f16\u8bd1\u671f\u5b8c\u6210\uff0c\u79f0\u4e3a\u81ea\u52a8\u5408\u6210 (autosynthesis)\u3002\u4e0e\u6b64\u76f8\u5173\u7684\u8fd8\u6709\u4e24\u4e2a\u5173\u952e\u8bcd\uff1a@dynamic \u548c @synthesize\u3002\n<\/p><\/blockquote>\n<ul>\n<li>@dynamic<\/li>\n<\/ul>\n<blockquote><p>\n\u544a\u8bc9\u7f16\u8bd1\u5668\u4e0d\u8981\u81ea\u52a8\u521b\u5efa\u5b9e\u73b0\u5c5e\u6027\u6240\u7528\u7684\u5b9e\u4f8b\u53d8\u91cf\uff0c\u4e5f\u4e0d\u8981\u4e3a\u5176\u521b\u5efa\u5b58\u53d6\u65b9\u6cd5\u3002\u5373\u4f7f\u7f16\u8bd1\u5668\u53d1\u73b0\u6ca1\u6709\u5b9a\u4e49\u5b58\u53d6\u65b9\u6cd5\u4e5f\u4e0d\u4f1a\u62a5\u9519\uff0c\u8fd0\u884c\u671f\u4f1a\u5bfc\u81f4\u5d29\u6e83\u3002\n<\/p><\/blockquote>\n<ul>\n<li>@synthesize<\/li>\n<\/ul>\n<blockquote><p>\n\u5728\u7c7b\u7684\u5b9e\u73b0\u6587\u4ef6\u91cc\u53ef\u4ee5\u901a\u8fc7 @synthesize \u6307\u5b9a\u5b9e\u4f8b\u53d8\u91cf\u7684\u540d\u79f0\u3002\n<\/p><\/blockquote>\n<ul>\n<li>\u6ce8\u610f<\/li>\n<\/ul>\n<blockquote><p>\n\u5728 Xcode \u8f83\u65e9\u7248\u672c\u4e4b\u524d\uff0c@property \u914d\u5408 @synthesize \u4f7f\u7528\uff0c@property \u8d1f\u8d23\u58f0\u660e\u5c5e\u6027\uff0c@synthesize \u8d1f\u8d23\u8ba9\u7f16\u8bd1\u5668\u751f\u6210 \u5e26\u4e0b\u5212\u7ebf\u7684\u5b9e\u4f8b\u53d8\u91cf\u5e76\u4e14\u81ea\u52a8\u751f\u6210 setter\u3001getter \u65b9\u6cd5\u3002Xcode \u65b0\u7248\u672c\u4e4b\u540e @property \u5f97\u5230\u589e\u5f3a\uff0c\u76f4\u63a5\u4e00\u5e76\u66ff\u4ee3\u4e86 @synthesize \u7684\u5de5\u4f5c\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 309px;\">\n<div class=\"image-view\" data-width=\"1200\" data-height=\"309\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-49a03c0f5e21530328e6c61b1e164966.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<p><strong>\u5176\u4ed6<\/strong><\/p>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 597px;\">\n<div class=\"image-view\" data-width=\"1200\" data-height=\"1023\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-dbc5a1db69e066692c2f25f04859fb92.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 525px;\">\n<div class=\"image-view\" data-width=\"1200\" data-height=\"900\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-e44d4425e02e5bc2bee886330cf8eaa4.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<h4>7.alloc\u3001init\u3001new\u3001dealloc \u533a\u522b<\/h4>\n<p><strong>alloc<\/strong><\/p>\n<blockquote><p>\nalloc\uff1a\u5f00\u8f9f\u4e00\u5757\u5185\u5b58\u7ed9\u5bf9\u8c61\uff0c\u8ba9\u5b83\u4e0d\u91ca\u653e\u5e76\u4e14\u628a\u5730\u5740\u8fd4\u56de\u7ed9\u6307\u9488\u3002<br \/>\n\u901a\u8fc7\u67e5\u770b objc \u6e90\u7801\u53d1\u73b0 alloc \u65b9\u6cd5\u4e3b\u8981\u505a\u4e86\u4e09\u4ef6\u4e8b\u60c5\uff1a<br \/>\n1.\u8ba1\u7b97\u7533\u8bf7\u5185\u5b58\u7a7a\u95f4\u5927\u5c0f<br \/>\n2.\u5f00\u8f9f\u5185\u5b58\u7a7a\u95f4<br \/>\n3.\u628a\u7c7b\u7684\u4fe1\u606f\u5173\u8054\u5230 isa \u4e0a\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 610px;\">\n<div class=\"image-view\" data-width=\"810\" data-height=\"610\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-59064e24dd4496a9cc4148dbfdc53a98.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">alloc \u5b9e\u73b0<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 459px;\">\n<div class=\"image-view\" data-width=\"803\" data-height=\"459\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-990b205d62cc2156c4ad51275b5c6b7d.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">alloc \u5b9e\u73b0<\/div>\n<\/div>\n<p><strong>init<\/strong><\/p>\n<blockquote><p>\ninit\uff1a\u5bf9\u8fd9\u5757\u5185\u5b58\u8fdb\u884c\u521d\u59cb\u5316\u3002\u901a\u8fc7\u67e5\u770b objc \u6e90\u7801\u53d1\u73b0 init \u65b9\u6cd5\u4ec0\u4e48\u4e8b\u60c5\u90fd\u6ca1\u505a\uff0c\u800c\u662f\u76f4\u63a5 return (id)self; \u3002\u6ca1\u4ec0\u4e48\u590d\u6742\u7684\uff0c\u82f9\u679c\u8fd9\u6837\u5199\u539f\u56e0\uff1ainit \u53ea\u662f\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\uff0c\u4e3a\u6211\u4eec\u81ea\u5b9a\u4e49\u7c7b\u7684\u65f6\u5019\u91cd\u5199\u63d0\u4f9b\u4fbf\u5229\u3002\u81ea\u5b9a\u4e49\u7c7b\u5f80\u5f80\u4f1a\u6709\u81ea\u5df1\u7684\u6784\u9020\u65b9\u6cd5\u5373\u91cd\u5199 init\uff0c\u5982 &#8211; (instancetype)initWithName: (NSString *)name;\n<\/p><\/blockquote>\n<p><strong>new<\/strong><\/p>\n<blockquote><p>\n\u901a\u8fc7\u67e5\u770b\u6e90\u7801 new \u8c03\u7528\u7684\u662f [callAlloc(self, false) init], \u76f8\u5f53\u4e8e\u8c03\u7528\u4e86 alloc init \u4e24\u4e2a\u65b9\u6cd5\u3002\u533a\u522b\u5c31\u5728\u4e8e new \u4e0d\u4f1a\u8c03\u7528\u81ea\u5b9a\u4e49\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u6240\u4ee5\u65e5\u5e38\u5f00\u53d1\u4e2d\u4e0d\u5efa\u4e49\u4f7f\u7528 new\u3002\n<\/p><\/blockquote>\n<p><strong>dealloc<\/strong><\/p>\n<blockquote><p>\ndealloc\uff1a\u5bf9\u8c61\u7684\u9500\u6bc1\uff0c\u5bf9\u8c61\u8981\u91ca\u653e\u5fc5\u987b\u6267\u884c\u6839\u7c7b NSObject \u4e2d -(void)dealloc()<br \/>\n\u65b9\u6cd5\uff0c\u56e0\u4e3a\u8be5\u65b9\u6cd5\u6700\u7ec8\u4f1a\u53bb\u6267\u884c C++ \u7684 objc_object::rootDealloc() \u65b9\u6cd5\u3002\u5bf9\u8c61\u7684\u9500\u6bc1\u6700\u7ec8\u5c31\u662f\u5728 rootDealloc() \u4e2d\u9500\u6bc1\u3002<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong><br \/>\n1.MRC \u8981\u8c03\u7528 [super dealloc];  ARC \u4e0d\u80fd\u8c03\u7528 [super dealloc];<br \/>\n2.<strong>MRC \u8981\u8c03\u7528\uff1a<\/strong>\u5728 MRC \u73af\u5883\u4e0b\u7cfb\u7edf\u4e0d\u4f1a\u81ea\u52a8\u91ca\u653e\u5bf9\u8c61\u3002\u7531\u4e8e\u5bf9\u8c61\u7684\u91ca\u653e\u5fc5\u987b\u8c03\u7528 c++ \u7684 rootDealloc() \u65b9\u6cd5\u3002\u56e0\u6b64\u4e00\u65e6\u6211\u4eec\u91cd\u5199\u4e86\u5bf9\u8c61\u7684 dealloc \u65b9\u6cd5\uff0c\u5982\u679c\u4e0d\u8c03\u7528 [super dealloc]; \u90a3\u4e48\u5c31\u4e0d\u4f1a\u8c03\u7528\u5230\u6839\u7c7b NSObject \u4e2d -(void)dealloc() \u65b9\u6cd5\u3002\u5bf9\u8c61\u4e5f\u5c31\u91ca\u653e\u4e0d\u6389\uff0c\u53ea\u662f\u5355\u5355\u6267\u884c\u4e86\u8be5\u7c7b -(void)dealloc() \u65b9\u6cd5\u5e76\u6ca1\u6709\u91ca\u653e\u5bf9\u8c61\u3002\u6240\u4ee5 MRC \u4e00\u65e6\u91cd\u5199\u4e86 -(void)dealloc() \u65b9\u6cd5\u4e00\u5b9a\u8981\u8c03\u7528 [super dealloc];\uff0c\u8fd9\u6837\u624d\u80fd\u91ca\u653e\u8be5\u5b9e\u4f8b\u5bf9\u8c61\u3002<br \/>\n3.<strong>ARC \u4e0d\u80fd\u8c03\u7528\uff1a<\/strong>ARC \u4f1a\u81ea\u52a8\u5e2e\u6211\u4eec\u5728\u4ee3\u7801\u7684\u9002\u5f53\u4f4d\u7f6e\u63d2\u5165 [obj release]; \u6211\u4eec\u4ec0\u4e48\u4e5f\u4e0d\u505a\uff0cARC \u5c31\u8c03\u7528\u4e86\u4e00\u6b21 C++ \u7684 objc_object::rootDealloc() \u65b9\u6cd5\u3002\u6b64\u65f6\u5982\u679c\u6211\u4eec\u518d\u6b21\u8c03\u7528\u4e86 [super dealloc]; \u65b9\u6cd5\uff0c\u90a3\u4e48\u6700\u7ec8\u4f1a\u8c03\u7528\u6839\u7c7b NSObject \u7684 release() \u65b9\u6cd5\uff0c\u5c31\u4f1a\u6267\u884c\u5230 C++ \u7684 objc_object::rootDealloc() \u65b9\u6cd5\uff0c\u7531\u4e8e ARC \u5df2\u7ecf\u91ca\u653e\u8be5\u5bf9\u8c61\u4e86\uff0c\u8fd9\u65f6\u518d\u6b21 free(this) \u91ca\u653e\u8be5\u5bf9\u8c61\u4f1a\u53d1\u751f\u9519\u8bef\u3002\u6240\u4ee5 ARC \u73af\u5883\u4e0b\u4e0d\u80fd\u8c03\u7528 [super dealloc];\uff0c\u4e0d\u7136\u4f1a\u5bfc\u81f4\u8be5\u5b9e\u4f8b\u5bf9\u8c61\u91cd\u590d\u91ca\u653e\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong><br \/>\nhttps:\/\/blog.csdn.net\/pk_sir\/article\/details\/107384255\n<\/p><\/blockquote>\n<h4>8.\u5f3a\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u5faa\u73af\u5f15\u7528<\/h4>\n<blockquote><p>\n\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e00\u4e2a\u6307\u9488\u90fd\u4f1a\u4f7f\u7528__strong \u5c5e\u6027\uff0c\u8868\u660e\u8fd9\u662f\u4e00\u4e2a\u5f3a\u5f15\u7528\u3002\u5f53\u6240\u6709\u5f3a\u5f15\u7528\u90fd\u53bb\u9664\u65f6\uff0c\u5bf9\u8c61\u624d\u80fd\u88ab\u91ca\u653e\u3002\u4f46\u6709\u65f6\u5019\u6211\u4eec\u53ef\u80fd\u8981\u7981\u6b62\u8fd9\u79cd\u884c\u4e3a\uff1a\u4e00\u4e9b\u96c6\u5408\u7c7b\u4e0d\u5e94\u8be5\u589e\u52a0\u5176\u5143\u7d20\u7684\u5f15\u7528\uff0c\u53ef\u80fd\u5bf9\u5bfc\u81f4\u5bf9\u8c61\u65e0\u6cd5\u91ca\u653e\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u5faa\u73af\u5f15\u7528\uff0c\u5bfc\u81f4\u65e0\u6cd5\u91ca\u653e\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u6211\u4eec\u8981\u4f7f\u7528\u5f31\u5f15\u7528 __weak\u3002weak \u662f\u5f31\u5f15\u7528\uff0c\u8ba1\u6570\u5668\u4e0d\u4f1a\u52a01\uff0c\u5e76\u5728\u5f15\u7528\u5bf9\u8c61\u88ab\u91ca\u653e\u7684\u65f6\u5019\u81ea\u52a8\u8bbe\u7f6e\u4e3a nil\u3002ARC \u63d0\u4f9b\u56db\u79cd\u4fee\u9970\u7b26\u5206\u522b\u662f\uff1a__strong\u3001__weak\u3001__autoreleasing\u3001__unsafe_unretained\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong>http:\/\/t.zoukankan.com\/geek6-p-3947985.html\n<\/p><\/blockquote>\n<ul>\n<li>\u8865\u5145\uff1aweak \u5c5e\u6027\u4fee\u9970\u8bcd\u4e0e __weak \u4ec0\u4e48\u5173\u7cfb\uff0c\u4e00\u4e2a\u4e1c\u897f\uff1f<\/li>\n<\/ul>\n<blockquote><p>\nweak \u5c5e\u6027\u4fee\u9970\u8bcd\uff1a\u4fee\u9970\u5c5e\u6027\u5bf9\u8c61\uff0c\u5c5e\u4e8e\u5f31\u5f15\u7528\uff0c\u4e0d\u4f7f\u7528\u7684\u65f6\u5019\u76f4\u63a5\u91ca\u653e\u5185\u5b58\uff0c\u4e0d\u4f1a\u9020\u6210\u91ce\u6307\u9488\u3002__weak\uff1a\u7528\u6765\u89e3\u51b3\u5faa\u73af\u5f15\u7528\u7684\u95ed\u73af\uff0c\u8fbe\u5230\u9500\u6bc1\u5bf9\u8c61\u7684\u6548\u679c\u3002\u5e95\u5c42\u5e94\u8be5\u90fd\u5dee\u4e0d\u591a\uff0c\u53ea\u662f\u4f7f\u7528\u573a\u666f\u7684\u5dee\u522b\u4e0d\u540c\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 424px; max-height: 279px;\">\n<div class=\"image-view\" data-width=\"424\" data-height=\"279\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-00d6fda44b8cc950aefca8abc073cf71.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u4e0e\u6240\u6709\u6743\u6709\u5173\u7cfb\u7684\u5c5e\u6027\u548c\u5173\u952e\u5b57\u4e4b\u95f4\u7684\u5bf9\u5e94\u5173\u7cfb<\/div>\n<\/div>\n<p><strong>\u5f3a\u5f15\u7528\uff08__strong\uff09<\/strong><\/p>\n<blockquote><p>\n\u5f3a\u5f15\u7528\uff1a\u6301\u6709\u6240\u6307\u5411\u5bf9\u8c61\u7684\u6240\u6709\u6743\uff0c\u65e0\u4fee\u9970\u7b26\u60c5\u51b5\u4e0b\u7a0b\u5e8f\u9ed8\u8ba4\u7684\u53d8\u91cf\u4fee\u9970\u7b26\u5c31\u662f  __strong\u3002\u5982\u9700\u5f3a\u5236\u91ca\u653e\u53ef\u7f6e nil\u3002\u5728 ARC \u4e2d\u4fee\u9970\u7b26\u662f __strong\uff0c\u6bd4\u5982 __strong NSObject *obj;<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>__strong \u4e0e\u53d8\u91cf\uff1a\u5728 ARC \u6a21\u5f0f\u4e0b\uff0cid \u7c7b\u578b\u548c OC \u5bf9\u8c61\u7684\u6240\u6709\u6743\u4fee\u9970\u7b26\u9ed8\u8ba4\u662f __strong\u3002\u5f53\u4e00\u4e2a\u53d8\u91cf\u901a\u8fc7 __strong \u4fee\u9970\u7b26\u6765\u4fee\u9970\uff0c\u5f53\u8be5\u53d8\u91cf\u8d85\u51fa\u5176\u6240\u5728\u4f5c\u7528\u57df\u540e\uff0c\u8be5\u53d8\u91cf\u5c31\u4f1a\u88ab\u5e9f\u5f03\uff0c\u540c\u65f6\u503c\u7ed9\u8be5\u53d8\u91cf\u7684\u5bf9\u8c61\u4e5f\u4f1a\u88ab\u91ca\u653e\u3002__strong \u4fee\u9970\u540e\uff0c\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4f1a\u589e\u52a0\uff0c\u5728\u4f5c\u7528\u57df\u5916\u4e0d\u4f1a\u9500\u6bc1\u3002\n<\/p><\/blockquote>\n<p><strong>\u5f31\u5f15\u7528\uff08__weak\uff09<\/strong><\/p>\n<blockquote><p>\n\u5f31\u5f15\u7528\uff1a\u4e0d\u6301\u6709\u6240\u6307\u5411\u5bf9\u8c61\u7684\u6240\u6709\u6743\uff0c\u5f15\u7528\u6307\u5411\u7684\u5bf9\u8c61\u5185\u5b58\u88ab\u56de\u6536\u4e4b\u540e\uff0c\u5f15\u7528\u672c\u8eab\u4f1a\u7f6e nil \u907f\u514d\u91ce\u6307\u9488\u3002\u5728 ARC \u4e2d\u4fee\u9970\u7b26\u662f __weak\uff0c\u6bd4\u5982 __weak NSObject *obj;  \u6bd4\u5982\u907f\u514d\u5faa\u73af\u5f15\u7528\u7684\u5f31\u5f15\u7528\u58f0\u660e\uff1a__weak __typeof(self) weakSelf = self;<br \/>\n<strong>\u6ce8\u610f\uff1a<\/strong>__weak \u4fee\u9970\u540e\uff0c\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u4e0d\u4f1a\u589e\u52a0\uff0c\u5728\u4f5c\u7528\u57df\u5916\u4f1a\u81ea\u52a8\u7f6e\u4e3a nil\u3002\n<\/p><\/blockquote>\n<ul>\n<li>\u5f3a\u5f15\u7528\u4e0e\u5f31\u5f15\u7528\u533a\u522b<\/li>\n<\/ul>\n<blockquote><p>\n1.\u4e24\u8005\u533a\u522b\u7b80\u5355\u8bb2\u7684\u8bdd\u5c31\u662f\uff1a\u5f3a\u5f15\u7528\u6301\u6709\u5bf9\u8c61\uff0c\u800c\u5f31\u5f15\u7528\u4e0d\u6301\u6709\u5bf9\u8c61\u3002<br \/>\n2.\u4ec0\u4e48\u65f6\u5019\u7528 strong \u548c weak\uff0c\u5e73\u65f6\u4e00\u822c\u90fd\u662f\u7528 strong\uff0c\u4e5f\u5c31\u662f\u9ed8\u8ba4\u4e0d\u6dfb\u52a0\uff0c\u5728\u4f1a\u7167\u6210\u5faa\u73af\u5f15\u7528\u65f6\u624d\u4f7f\u7528 weak\u3002\n<\/p><\/blockquote>\n<p><strong>\u5faa\u73af\u5f15\u7528<\/strong><\/p>\n<blockquote><p>\n1.\u5f53\u4e24\u4e2a\u4e0d\u540c\u7684\u5bf9\u8c61\u5404\u6709\u4e00\u4e2a\u5f3a\u5f15\u7528\u6307\u5411\u5bf9\u65b9\uff0c\u90a3\u4e48\u5faa\u73af\u5f15\u7528\u5c31\u4ea7\u751f\u4e86\uff0c\u6bcf\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u90fd\u4f1a+1\uff0c\u65e0\u6cd5\u5f97\u5230\u5185\u5b58\u7684\u91ca\u653e\u3002\u53ea\u6709\u5728\u5806\u4e2d\u7684\u76f8\u4e92\u5f15\u7528\u65e0\u6cd5\u56de\u6536\uff0c\u6709\u53ef\u80fd\u9020\u6210\u5faa\u73af\u5f15\u7528\uff0c\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u8c03\u7528\u4e86 new\uff0calloc \u7b49\u5173\u952e\u5b57\u624d\u6709\u53ef\u80fd\u51fa\u73b0\u5faa\u73af\u5f15\u7528\u3002<br \/>\n2.\u5faa\u73af\u5f15\u7528\u7684\u5b9e\u8d28\u662f\u591a\u4e2a\u5bf9\u8c61\u76f8\u4e92\u4e4b\u95f4\u6709\u5f3a\u5f15\u7528\uff0c\u4e0d\u80fd\u91ca\u653e\u5bfc\u81f4\u65e0\u6cd5\u56de\u6536\uff0c\u89e3\u51b3\u65b9\u6cd5\u4e00\u822c\u662f\u5c06 strong \u5f15\u7528\u6539\u4e3a weak \u5f15\u7528\u3002\n<\/p><\/blockquote>\n<ul>\n<li>\u4ee3\u7406\uff08delegate\uff09\u5faa\u73af\u5f15\u7528\u95ee\u9898<\/li>\n<\/ul>\n<blockquote><p>\ndelegate \u662f iOS \u5f00\u53d1\u4e2d\u6bd4\u8f83\u5e38\u9047\u5230\u7684\u5faa\u73af\u5f15\u7528\uff0c\u4e00\u822c\u5728\u58f0\u660e delegate \u7684\u65f6\u5019\u90fd\u8981\u4f7f\u7528\u5f31\u5f15\u7528 weak \u6216\u8005 assign\uff0c\u5f53\u7136\u600e\u4e48\u9009\u62e9\u4f7f\u7528 assign \u8fd8\u662f weak\uff0cMRC \u7684\u8bdd\u53ea\u80fd\u7528 assign\uff0c\u5728 ARC \u7684\u60c5\u51b5\u4e0b\u6700\u597d\u4f7f\u7528 weak\uff0c\u56e0\u4e3a weak \u4fee\u9970\u7684\u53d8\u91cf\u5728\u91ca\u653e\u540e\u81ea\u52a8\u6307\u5411 nil\uff0c\u9632\u6b62\u91ce\u6307\u9488\u5b58\u5728\u3002<br \/>\ndelegate \u5c5e\u6027\u7684\u58f0\u660e\u4e00\u822c\u662f weak\uff1a@property (nonatomic, weak) id <testdelegate> delegate;<\/testdelegate>\n<\/p><\/blockquote>\n<ul>\n<li>block \u5faa\u73af\u5f15\u7528\u95ee\u9898<\/li>\n<\/ul>\n<blockquote><p>\n1.\u7531\u4e8e block \u4f1a\u5bf9 block \u4e2d\u7684\u5bf9\u8c61\u8fdb\u884c\u6301\u6709\u64cd\u4f5c\uff0c\u5c31\u76f8\u5f53\u4e8e\u6301\u6709\u4e86\u5176\u4e2d\u7684\u5bf9\u8c61\uff0c\u5982\u679c\u6b64\u65f6 block \u4e2d\u7684\u5bf9\u8c61\u53c8\u6301\u6709\u4e86\u8be5 block \u5219\u4f1a\u9020\u6210\u5faa\u73af\u5f15\u7528\uff0c\u89e3\u51b3\u65b9\u6848\u5c31\u662f\u4f7f\u7528 weak \u8fdb\u884c\u5f31\u5f15\u7528\u3002\u6bd4\u5982 block \u5728 copy \u65f6\u90fd\u4f1a\u5bf9 block \u5185\u90e8\u7528\u5230\u7684\u5bf9\u8c61\u8fdb\u884c\u5f3a\u5f15\u7528\u9020\u6210\u5faa\u73af\u5f15\u7528\u3002<br \/>\n2.\u5e76\u4e0d\u662f\u6240\u6709\u7684 block \u90fd\u4f1a\u9020\u6210\u5faa\u73af\u5f15\u7528\uff0c\u53ea\u6709\u88ab\u5f3a\u5f15\u7528\u4e86\u7684 block \u624d\u4f1a\u4ea7\u751f\u5faa\u73af\u5f15\u7528\uff0c\u5177\u4f53\u770b\u60c5\u51b5\u3002\u6bd4\u5982 dispatch_async(dispatch-get_main_queue(),^{}),[UIView animateWithDuration:1 animations:^{}] \u8fd9\u4e9b\u7cfb\u7edf\u65b9\u6cd5\u7b49\uff0c\u6216\u8005 block \u5e76\u4e0d\u662f\u5176\u5c5e\u6027\u800c\u662f\u4e34\u65f6\u53d8\u91cf\u5373\u6808 block\uff0c\u8fd9\u4e9b\u90fd\u4e0d\u4f1a\u4ea7\u751f\u5faa\u73af\u5f15\u7528\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong>https:\/\/juejin.cn\/post\/6998919742010425357\n<\/p><\/blockquote>\n<p>1.block \u5faa\u73af\u5f15\u7528\u4e3e\u4f8b\uff1a<\/p>\n<pre><code>self.myBlock = ^{\n     [self doSomething];\/\/\u8fd9\u4e2a self \u5c31\u662f\u5f3a\u5f15\u7528\n};\n\n\u7531\u4e8e block \u4f1a\u5bf9 block \u4e2d\u7684\u5bf9\u8c61\u8fdb\u884c\u6301\u6709\u64cd\u4f5c\uff0c\u5c31\u76f8\u5f53\u4e8e\u6301\u6709\u4e86\u5176\u4e2d\u7684\u5bf9\u8c61\uff0c\u5982\u679c\u6b64\u65f6 block \u4e2d\u7684\u5bf9\u8c61\u53c8\u6301\u6709\u4e86\u8be5 block\uff0c\u5219\u4f1a\u9020\u6210\u5faa\u73af\u5f15\u7528\u3002\n\u89e3\u51b3\u65b9\u6848\u5c31\u662f\u4f7f\u7528 __weak \u4fee\u9970 self \u5373\u53ef\uff1a\n\n__weak typeof(self) weakSelf = self;\nself.myBlock = ^{\n     [weakSelf doSomething];\n};\n<\/code><\/pre>\n<p>2.\u4f7f\u7528 block \u4e0d\u4f1a\u9020\u6210\u5faa\u73af\u5f15\u7528\u7684\u8bf4\u660e\uff1a<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 678px;\">\n<div class=\"image-view\" data-width=\"948\" data-height=\"917\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-487729ce22df6bcff9f3d88074ce8859.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u4f7f\u7528 block \u4e0d\u4f1a\u9020\u6210\u5faa\u73af\u5f15\u7528\u7684\u8bf4\u660e<\/div>\n<\/div>\n<p>3.__block \u7684\u4f5c\u7528<\/p>\n<blockquote><p>\n__block \u7684\u6839\u672c\u4f5c\u7528\u5c31\u662f\u628a block \u7684\u5916\u90e8\u53d8\u91cf\u7684\u5730\u5740\u4ece\u6808\u533a\u653e\u5230\u5806\u533a\u3002__block \u53ea\u8981\u89c2\u5bdf\u5230\u67d0\u4e00\u4e2a\u6210\u5458\u53d8\u91cf\u88ab block \u6240\u6301\u6709\uff0c\u5c31\u4f1a\u628a\u8be5\u53d8\u91cf\u7684\u5185\u5b58\u5730\u5740\u4ece\u6808\u533a\u653e\u5230\u5806\u533a\u3002\u56e0\u6b64\u5728\u5806\u533a\u7684\u8be5\u6210\u5458\u53d8\u91cf\u5c31\u4f1a\u53d8\u6210\u6709\u7528\u6237\u81ea\u5df1\u5206\u914d\u548c\u91ca\u653e\uff0c\u4e0d\u4f1a\u88ab\u7cfb\u7edf\u7ba1\u7406\u9020\u6210\u4e22\u5931\u3002<br \/>\n<strong>\u76f8\u4e92\u94fe\u63a5\uff1a<\/strong>https:\/\/www.jianshu.com\/p\/3d3878649b4d\n<\/p><\/blockquote>\n<ul>\n<li>Timer \u5b9a\u65f6\u5668\u5faa\u73af\u5f15\u7528\u95ee\u9898<\/li>\n<\/ul>\n<blockquote><p>\n\u5728\u63a7\u5236\u5668\u5185\uff0c\u521b\u5efaNSTimer\u4f5c\u4e3a\u5176\u5c5e\u6027\uff0c\u7531\u4e8e\u5b9a\u65f6\u5668\u521b\u5efa\u540e\u4e5f\u4f1a\u5f3a\u5f15\u7528\u8be5\u63a7\u5236\u5668\u5bf9\u8c61\uff0c\u90a3\u4e48\u8be5\u5bf9\u8c61\u548c\u5b9a\u65f6\u5668\u5c31\u76f8\u4e92\u5faa\u73af\u5f15\u7528\u4e86\u3002\u89e3\u51b3\u529e\u6cd5\u4e3a\uff1a\u53ef\u4ee5\u4f7f\u7528\u624b\u52a8\u65ad\u5f00\u5faa\u73af\u5f15\u7528\uff0c\u5982\u679c\u662f\u4e0d\u91cd\u590d\u5b9a\u65f6\u5668\uff0c\u5728\u56de\u8c03\u65b9\u6cd5\u91cc\u5c06\u5b9a\u65f6\u5668 invalidate \u5e76\u7f6e\u4e3a nil \u5373\u53ef\uff1b\u5982\u679c\u662f\u91cd\u590d\u5b9a\u65f6\u5668\uff0c\u5728\u5408\u9002\u7684\u4f4d\u7f6e\u5c06\u5176 invalidate \u5e76\u7f6e\u4e3a nil \u5373\u53ef\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong><br \/>\nhttps:\/\/juejin.cn\/post\/6992501463058481188<br \/>\nhttps:\/\/juejin.cn\/post\/6844903968250789896\n<\/p><\/blockquote>\n<p><strong>__unsafe_unretained<\/strong><\/p>\n<blockquote><p>\n__unsafe_unretained \u4fee\u9970\u540e\u5f15\u7528\u8ba1\u6570\u4e0d\u4f1a\u589e\u52a0\uff0c\u5728\u4f5c\u7528\u57df\u5916\u4e0d\u4f1a\u7f6e\u7a7a\uff0c\u4f1a\u9020\u6210\u91ce\u6307\u9488\u95ea\u9000\u3002\n<\/p><\/blockquote>\n<h4>9.weak\u8be6\u89e3<\/h4>\n<p><strong>\u6982\u5ff5<\/strong><\/p>\n<blockquote><p>\nweak \u662f\u5f31\u5f15\u7528\uff0c\u7528 weak \u6765\u4fee\u9970\u3001\u63cf\u8ff0\u6240\u5f15\u7528\u5bf9\u8c61\u7684\u8ba1\u6570\u5668\u5e76\u4e0d\u4f1a\u589e\u52a0\uff0c\u800c\u4e14 weak \u4f1a\u5728\u5f15\u7528\u5bf9\u8c61\u88ab\u91ca\u653e\u7684\u65f6\u5019\u81ea\u52a8\u7f6e\u4e3a nil\uff0c\u8fd9\u4e5f\u5c31<strong>\u907f\u514d\u4e86\u91ce\u6307\u9488<\/strong>\u8bbf\u95ee\u574f\u5185\u5b58\u800c\u5f15\u8d77\u5954\u6e83\u7684\u60c5\u51b5\uff0c\u53e6\u5916 weak \u4e5f\u53ef\u4ee5<strong>\u89e3\u51b3\u5faa\u73af\u5f15\u7528<\/strong>\u3002<br \/>\n<strong>\u62d3\u5c55\uff1a\u4e3a\u4ec0\u4e48\u4fee\u9970\u4ee3\u7406\u4f7f\u7528 weak \u800c\u4e0d\u662f\u7528 assign\uff1f<\/strong><br \/>\nassign \u53ef\u7528\u6765\u4fee\u9970\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u53ef\u4fee\u9970 OC \u7684\u5bf9\u8c61\uff0c\u4f46\u5982\u679c\u7528 assign \u4fee\u9970\u5bf9\u8c61\u7c7b\u578b\u6307\u5411\u7684\u662f\u4e00\u4e2a\u5f3a\u6307\u9488\uff0c\u5f53\u6307\u5411\u7684\u8fd9\u4e2a\u6307\u9488\u91ca\u653e\u4e4b\u540e\uff0c\u5b83\u4ecd\u6307\u5411\u8fd9\u5757\u5185\u5b58\uff0c\u5fc5\u987b\u8981\u624b\u52a8\u7ed9\u7f6e\u4e3a nil\uff0c\u5426\u5219\u4f1a\u4ea7\u751f\u91ce\u6307\u9488\u3002\u5982\u679c\u8fd8\u901a\u8fc7\u6b64\u6307\u9488\u64cd\u4f5c\u90a3\u5757\u5185\u5b58\uff0c\u4f1a\u5bfc\u81f4EXC_BAD_ACCESS \u9519\u8bef\uff0c\u56e0\u4e3a\u8c03\u7528\u4e86\u5df2\u7ecf\u88ab\u91ca\u653e\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u800c weak \u53ea\u80fd\u7528\u6765\u4fee\u9970 OC \u5bf9\u8c61\uff0c\u800c\u4e14\u76f8\u6bd4 assign \u6bd4\u8f83\u5b89\u5168\uff0c\u5982\u679c\u6307\u5411\u7684\u5bf9\u8c61\u6d88\u5931\u4e86\uff0c\u90a3\u4e48\u5b83\u4f1a\u81ea\u52a8\u7f6e\u4e3a nil\uff0c\u4e0d\u4f1a\u5bfc\u81f4\u91ce\u6307\u9488\u3002<br \/>\n<strong>\u76f8\u5173\u94fe\u63a5\uff1a<\/strong><br \/>\nhttps:\/\/www.jianshu.com\/p\/fec68e84cee9<br \/>\nhttps:\/\/juejin.cn\/post\/6993634762896195615\n<\/p><\/blockquote>\n<p><strong>weak\u5b9e\u73b0\u539f\u7406\u7684\u6982\u62ec<\/strong><\/p>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 505px;\">\n<div class=\"image-view\" data-width=\"972\" data-height=\"505\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-53d5b9ff5f4bba7391aebe8ee125524e.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">weak \u5b9e\u73b0\u539f\u7406\u7684\u6982\u62ec<\/div>\n<\/div>\n<p><strong>\u5f53 weak \u5f15\u7528\u6307\u5411\u7684\u5bf9\u8c61\u88ab\u91ca\u653e\u65f6\uff0c\u53c8\u662f\u5982\u4f55\u53bb\u5904\u7406 weak \u6307\u9488\u7684\u5462\uff1f<\/strong><\/p>\n<blockquote><p>\n\u5f53\u91ca\u653e\u5bf9\u8c61\u65f6\uff0c\u5176\u57fa\u672c\u6d41\u7a0b\u5982\u4e0b\uff1a<br \/>\n1.\u8c03\u7528 objc_release<br \/>\n2.\u56e0\u4e3a\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4e3a0\uff0c\u6240\u4ee5\u6267\u884c dealloc<br \/>\n3.\u5728 dealloc \u4e2d\uff0c\u8c03\u7528\u4e86 _objc_rootDealloc \u51fd\u6570<br \/>\n4.\u5728 _objc_rootDealloc \u4e2d\uff0c\u8c03\u7528\u4e86 object_dispose \u51fd\u6570<br \/>\n5.\u8c03\u7528 objc_destructInstance<br \/>\n6.\u6700\u540e\u8c03\u7528 objc_clear_deallocating<br \/>\n\u8c03\u7528\u7684 objc_clear_deallocating \u51fd\u6570\u4e2d\uff0c\u8c03\u7528\u4e86 clearDeallocating\uff0c\u5b83\u6700\u7ec8\u662f\u4f7f\u7528\u4e86\u8fed\u4ee3\u5668\u6765\u53d6 weak \u8868\u7684 value\uff0c\u7136\u540e\u8c03\u7528 weak_clear_no_lock\uff0c\u7136\u540e\u67e5\u627e\u5bf9\u5e94\u7684 value\uff0c\u5c06\u8be5 weak \u6307\u9488\u7f6e\u7a7a\u3002\n<\/p><\/blockquote>\n<p><strong>IBOutlet \u8fde\u51fa\u6765\u7684\u89c6\u56fe\u5c5e\u6027\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u88ab\u8bbe\u7f6e\u6210 weak\uff1f<\/strong><\/p>\n<blockquote><p>\n\u5728 storyboard \u4e2d\u6dfb\u52a0\u4e00\u4e2a\u63a7\u4ef6\u5f15\u7528\u5173\u7cfb\u662f\u8fd9\u6837\u7684(\u4ee5 UIbutton \u4e3a\u4f8b): UIviewController -> UIview -> UIbutton\u3002\u6b64\u65f6 UIviewController \u5f3a\u5f15\u7528\u7740 UIview\uff0cUIview \u5f3a\u5f15\u7528\u7740 UIbutton\uff0cIBoutlet \u8fde\u7ebf\u5230\u63a7\u5236\u5668\u7684 .m \u6216\u8005 .h \u4e2d\u4f5c\u4e3a\u89c6\u56fe\u7684\u5c5e\u6027\u65f6\u7528 weak \u4fee\u9970\u5c31\u53ef\u4ee5\u4e86, (\u89c9\u5f97\u7528 strong \u4fee\u9970\u4e5f\u53ef\u4ee5\u4f46\u662f\u6ca1\u6709\u5fc5\u8981)\u3002\u6dfb\u52a0\u5230\u5b50\u63a7\u4ef6\u4e5f\u662f\u5f3a\u5f15\u7528: UIbutton \u5c31\u662f\u6dfb\u52a0\u5230\u4e86 UIviewController \u7684 view \u4e0a\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 506px; max-height: 332px;\">\n<div class=\"image-view\" data-width=\"506\" data-height=\"332\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-7d99e6dcd6013186ad018f7293d4fac9.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<p><strong>\u603b\u7ed3<\/strong><\/p>\n<blockquote><p>\n1.\u4e3a\u4e86\u7ba1\u7406\u6240\u6709\u7684\u5f15\u7528\u8ba1\u6570\u548c weak \u6307\u9488\uff0c\u82f9\u679c\u521b\u5efa\u4e86\u4e00\u4e2a\u5168\u5c40\u7684 SideTables\uff0c\u5b83\u662f\u4e00\u4e2a\u5168\u5c40\u7684 hash \u8868\uff08\u5373 weak \u7684\u539f\u7406\u5728\u4e8e\u5e95\u5c42\u7ef4\u62a4\u4e86\u4e00\u5f20 weak_table_t \u7ed3\u6784\u7684 hash \u8868\uff09\uff0c\u7528\u4e8e\u5b58\u50a8\u6307\u5411\u67d0\u4e2a\u5bf9\u8c61\u7684\u6240\u6709 weak \u6307\u9488\uff0ckey \u662f\u6240\u6307\u5411\u5bf9\u8c61\u7684\u5730\u5740\uff0cvalue \u662f weak \u6307\u9488\u7684\u5730\u5740\u6570\u7ec4\uff0c\u91cc\u9762\u5b58\u653e\u7684\u90fd\u662f SideTable \u7ed3\u6784\u4f53\u3002<br \/>\n2.weak \u5173\u952e\u5b57\u7684\u4f5c\u7528\u662f\u5f31\u5f15\u7528\uff0c\u8ba1\u6570\u5668\u4e0d\u4f1a\u52a01\uff0c\u5e76\u5728\u5f15\u7528\u5bf9\u8c61\u88ab\u91ca\u653e\u7684\u65f6\u5019\u81ea\u52a8\u8bbe\u7f6e\u4e3a nil\u3002<br \/>\n3.\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u76f8\u5173\u7684\u64cd\u4f5c\u662f\u539f\u5b50\u6027\u7684\uff0c\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u4e8b\u64cd\u4f5c\u4e00\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4f1a\u9020\u6210\u6570\u636e\u9519\u4e71\uff0c\u540c\u65f6\u5728\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u6570\u636e\u91cf\u5927\uff0c\u4e0d\u80fd\u8bfb\u6574\u4e2a Hash \u52a0\u9501\uff0c\u6240\u4ee5\u82f9\u679c\u91c7\u7528\u4e86\u5206\u79bb\u9501\u3002<br \/>\n4.\u5bf9\u8c61\u91ca\u653e\u65f6\uff0c\u8c03\u7528 clearDeallocating \u51fd\u6570\u6839\u636e\u5bf9\u8c61\u5730\u5740\u83b7\u53d6\u6240\u6709 weak \u6307\u9488\u5730\u5740\u7684\u6570\u7ec4\uff0c\u7136\u540e\u904d\u5386\u8fd9\u4e2a\u6570\u7ec4\u628a\u5176\u4e2d\u7684\u6570\u636e\u8bbe\u4e3a nil\uff0c\u6700\u540e\u628a\u8fd9\u4e2a entry \u4ece weak \u8868\u4e2d\u5220\u9664\uff0c\u6700\u540e\u6e05\u7406\u5bf9\u8c61\u7684\u8bb0\u5f55\u3002\n<\/p><\/blockquote>\n<h4>10.\u6df1\u6d45\u62f7\u8d1d\u7406\u89e3<\/h4>\n<blockquote><p>\n1.\u7b80\u5355\u7406\u89e3\u5c31\u662f\uff1a\u6d45\u62f7\u8d1d\u662f\u62f7\u8d1d\u4e86\u6307\u5411\u5bf9\u8c61\u7684\u6307\u9488\uff0c \u6df1\u62f7\u8d1d\u4e0d\u4f46\u62f7\u8d1d\u4e86\u5bf9\u8c61\u7684\u6307\u9488\u8fd8\u5728\u7cfb\u7edf\u4e2d\u518d\u5206\u914d\u4e00\u5757\u5185\u5b58\uff0c\u5b58\u653e\u62f7\u8d1d\u5bf9\u8c61\u7684\u5185\u5bb9\u3002<br \/>\n2.\u6d45\u62f7\u8d1d\uff1a\u62f7\u8d1d\u5bf9\u8c61\u672c\u8eab\uff0c\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6307\u5411\u76f8\u540c\u7684\u5185\u5b58\u5730\u5740\u3002 \u6df1\u62f7\u8d1d\uff1a\u62f7\u8d1d\u5bf9\u8c61\u672c\u8eab\uff0c\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6307\u5411\u4e0d\u540c\u7684\u5185\u5b58\u5730\u5740\u3002<br \/>\n3.\u6d45\u62f7\u8d1d\u4e0e\u6df1\u62f7\u8d1d\u7684\u672c\u8d28\u533a\u522b\uff1a\u5728\u4e8e\u662f\u5426\u5728\u5806\u5185\u5b58\u4e2d\u5f00\u8f9f\u65b0\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u6d45\u62f7\u8d1d\u5e76\u4e0d\u662f\u62f7\u8d1d\u5bf9\u8c61\u672c\u8eab\uff0c\u800c\u662f\u5bf9\u6307\u5411\u5bf9\u8c61\u7684\u6307\u9488\u8fdb\u884c\u62f7\u8d1d\uff0c\u4f46\u8fd8\u662f\u6307\u5411\u540c\u4e00\u5757\u5806\u5185\u5b58\u4e2d\u6307\u9488\u6307\u5411\u7684\u5bf9\u8c61\u3002\u6df1\u62f7\u8d1d\u76f4\u63a5\u62f7\u8d1d\u5bf9\u8c61\u5230\u5185\u5b58\u4e2d\u7684\u4e00\u5757\u533a\u57df\uff0c\u7136\u540e\u628a\u65b0\u5bf9\u8c61\u7684\u6307\u9488\u6307\u5411\u8fd9\u5757\u5185\u5b58\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 672px;\">\n<div class=\"image-view\" data-width=\"968\" data-height=\"672\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-f1988f141af8e8ad7a650d2225313c60.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u6d45\u62f7\u8d1d\uff1a\u53ef\u4ee5\u770b\u51fa\u6d45\u62f7\u8d1d\u4e2d\u6808\u5185\u5b58\u4e2d\u6307\u9488\u5bf9\u8c61\u7684\u5730\u5740\u6539\u53d8\u4e86\uff0c\u4f46\u8fd8\u662f\u6307\u5411\u76f8\u540c\u7684\u4e00\u5757\u5806\u5185\u5b58\u5730\u5740<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 489px;\">\n<div class=\"image-view\" data-width=\"1070\" data-height=\"746\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-98c873f60e84c0dcbe15d7113bc4161e.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u6df1\u62f7\u8d1d\uff1a\u53ef\u4ee5\u770b\u51fa\u6df1\u62f7\u8d1d\u662f\u76f4\u63a5\u62f7\u8d1d\u5bf9\u8c61\u5230\u5185\u5b58\u4e2d\u7684\u4e00\u5757\u533a\u57df\uff08\u5206\u914d\u4e86\u4e00\u5757\u65b0\u7684\u5185\u5b58\u7a7a\u95f4\uff09\uff0c\u7136\u540e\u628a\u65b0\u5bf9\u8c61\u7684\u6307\u9488\u6307\u5411\u8fd9\u5757\u5185\u5b58\uff0c\u539f\u5bf9\u8c61\u548c\u88ab\u8d4b\u503c\u5bf9\u8c61\u4e92\u4e0d\u5f71\u54cd<\/div>\n<\/div>\n<ul>\n<li>\u5173\u4e8e Copy \u7684\u4f7f\u7528<\/li>\n<\/ul>\n<blockquote><p>\n1.\u5728 oc \u4e2d copy \u662f\u5229\u7528\u4e00\u4e2a\u6e90\u5bf9\u8c61\u4ea7\u751f\u4e00\u4e2a\u526f\u672c\u5bf9\u8c61\uff0c\u672c\u8d28\u5c31\u662f\u4fee\u6539\u6e90\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u884c\u4e3a\uff0c\u4e0d\u4f1a\u5f71\u54cd\u526f\u672c\u5bf9\u8c61\uff0c\u540c\u6837\u4fee\u6539\u526f\u672c\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u884c\u4e3a\uff0c\u4e0d\u4f1a\u5f71\u54cd\u6e90\u5bf9\u8c61\u3002<br \/>\n2.\u5982\u4f55\u4f7f\u7528 copy\uff1a\u4e00\u4e2a\u5bf9\u8c61\u53ef\u4ee5\u8c03\u7528 copy \u6216 mutableCopy \u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u526f\u672c\u5bf9\u8c61\uff1bcopy \u521b\u5efa\u7684\u662f\u4e0d\u53ef\u53d8\u526f\u672c\uff08NSString\u3001NSArray\u3001NSDictionary\u2026\uff09\uff1bmutableCopy \u521b\u5efa\u7684\u662f\u53ef\u53d8\u526f\u672c\uff08\u5982NSMutableString\u3001NSMutableArray\u3001NSMutableDictionary\u2026\uff09\u3002<br \/>\n3.copy\u4f7f\u7528\u7684\u524d\u63d0\uff1a\u5fc5\u987b\u6309 NSCopying \u534f\u8bae\u5b9e\u73b0 copyWithZone: \u65b9\u6cd5<\/p>\n<pre><code>@protocol NSCopying\n- (id)copyWithZone:(NSZone *)zone;\n@end\n<\/code><\/pre>\n<p>4.mutableCopy\u7684\u4f7f\u7528\u524d\u63d0\uff1a\u5fc5\u987b\u6309 NSMutableCopying \u534f\u8bae\u5b9e\u73b0 mutableCopyWithZone: \u65b9\u6cd5<\/p>\n<pre><code>@protocol NSMutableCopying\n- (id)mutableCopyWithZone:(NSZone *)zone;\n@end\n<\/code><\/pre>\n<\/blockquote>\n<ul>\n<li>\u4e3e\u4f8b\u8bf4\u660e\u6df1\u6d45\u62f7\u8d1d<\/li>\n<\/ul>\n<blockquote><p>\n<strong>\u5148\u6765\u5f62\u8c61\u89e3\u91ca\u4e00\u6ce2\uff1a<\/strong><br \/>\n<strong>\u89e3\u91ca1\uff1a<\/strong><br \/>\n\u6d45\u62f7\u8d1d\u5373\u5982\u679c\u62f7\u8d1d\u4e00\u4e2a\u5bf9\u8c61\uff0c\u800c\u4e0d\u62f7\u8d1d\u5b83\u7684\u5b50\u5bf9\u8c61\uff1b<br \/>\n\u6df1\u62f7\u8d1d\uff1a\u62f7\u8d1d\u4e00\u4e2a\u5bf9\u8c61\u65f6\u8fde\u540c\u5b50\u5bf9\u8c61\u4e00\u8d77\u62f7\u8d1d<br \/>\n<strong>\u89e3\u91ca2\uff1a<\/strong><br \/>\n\u6d45\u62f7\u8d1d\uff1a\u5411retain\u4e00\u6837\uff0c\u521b\u5efa\u4e00\u4e2a\u6307\u9488\u6307\u5411\u4e86\u540c\u4e00\u5757\u5185\u5b58\u7a7a\u95f4\uff08\u5373\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e0d\u4ea7\u751f\u65b0\u5bf9\u50cf\uff09\uff0c\u4f7f\u8be5\u5185\u5b58\u7a7a\u95f4\u5f15\u7528\u8ba1\u6570\u52a01<br \/>\n\u6df1\u62f7\u8d1d\uff1a\u5411copy\u4e00\u6837\uff0c\u590d\u5236\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4ea7\u751f\u4e86\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff1b\u65b0\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4e3a1\uff0c\u65e7\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4e0d\u53d8<br \/>\n<strong>\u8865\u5145 &#8211; \u6df1\u62f7\u8d1d\u7528\u5f52\u6863\u548c\u89e3\u5f52\u6863\u53ef\u4ee5\u5b9e\u73b0\uff1a<\/strong><br \/>\n\u4f8b\u5b50\uff1a\u4eba&#8212;\u5173\u8054\u4e00\u4e2a\u8f66&#8212;\u8f66\u518d\u5173\u8054\u4e00\u4e2a\u5f15\u64ce<br \/>\n\u5e94\u7528\u573a\u666f\uff1a\u7528\u521d\u59cb\u5316alloc init \u521b\u5efa\u5bf9\u8c61\uff0c\u901f\u5ea6\u6162\uff0c\u5185\u5b58&#8230;\uff1b\u6240\u4ee5\u8003\u8651\u7528\u590d\u5236\u5bf9\u8c61\u65b9\u5f0f\u6765\u521b\u5efa\n<\/p><\/blockquote>\n<blockquote><p>\n<strong>1.\u6d45\u590d\u5236\uff08\u6d45\u62f7\u8d1d\uff0c\u6307\u9488\u62f7\u8d1d\uff0cshallow copy\uff09<\/strong><\/p>\n<ul>\n<li>\u6e90\u5bf9\u8c61\u548c\u526f\u672c\u5bf9\u8c61\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61<\/li>\n<li>\u6e90\u5bf9\u8c61\uff08\u526f\u672c\u5bf9\u8c61\uff09\u5f15\u7528\u8ba1\u6570\u5668+1,\u76f8\u5f53\u4e8e\u505a\u4e00\u6b21retain\u64cd\u4f5c<\/li>\n<li>\u672c\u8d28\uff1a\u6ca1\u6709\u4ea7\u751f\u65b0\u7684\u5bf9\u8c61<\/li>\n<\/ul>\n<pre><code>NSString *srcStr = @\"1gcode\";\nNSString *copyStr = [srcStr copy];\nNSLog(@\"srcStr = %p, copyStr = %p\", srcStr, copyStr);\n<\/code><\/pre>\n<p><strong>2.\u6df1\u590d\u5236\uff08\u6df1\u62f7\u8d1d\uff0c\u5185\u5bb9\u62f7\u8d1d\uff0cdeep copy\uff09<\/strong><\/p>\n<ul>\n<li>\u6e90\u5bf9\u8c61\u548c\u526f\u672c\u5bf9\u8c61\u662f\u4e0d\u540c\u7684\u4e24\u4e2a\u5bf9\u8c61<\/li>\n<li>\u6e90\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u5668\u4e0d\u53d8,\u526f\u672c\u5bf9\u8c61\u8ba1\u6570\u5668\u4e3a1\uff08\u56e0\u4e3a\u662f\u65b0\u4ea7\u751f\u7684\uff09<\/li>\n<li>\u672c\u8d28\uff1a\u4ea7\u751f\u4e86\u65b0\u7684\u5bf9\u8c61<\/li>\n<\/ul>\n<pre><code>NSString *srcStr = @\"1gcode\";\nNSMutableString *copyStr = [srcStr mutableCopy];\nNSLog(@\"src = %p, copy = %p\", srcStr, copyStr);\nNSLog(@\"src = %@, copy = %@\", srcStr, copyStr);\n[copyStr appendString:@\" cool\"];\nNSLog(@\"src = %@, copy = %@\", srcStr, copyStr);\n<\/code><\/pre>\n<pre><code>NSMutableString *srcStr = [NSMutableString stringWithFormat:@\"1gcode\"];\nNSString *copyStr = [srcStr copy];\n[srcStr appendString:@\".com\"];\nNSLog(@\"src = %p, copy = %p\", srcStr, copyStr);\nNSLog(@\"src = %@, copy = %@\", srcStr, copyStr);\n<\/code><\/pre>\n<pre><code>NSMutableString *srcStr = [NSMutableString stringWithFormat:@\"1gcode\"];\nNSMutableString *copyStr = [srcStr mutableCopy];\n[srcStr appendString:@\".com\"];\n[copyStr appendString:@\" good\"];\nNSLog(@\"src = %p, copy = %p\", srcStr, copyStr);\nNSLog(@\"src = %@, copy = %@\", srcStr, copyStr);\n<\/code><\/pre>\n<\/blockquote>\n<ul>\n<li>copy\u4e0e\u5185\u5b58\u7ba1\u7406<\/li>\n<\/ul>\n<blockquote><p>\n1.\u5982\u679c\u662f\u6d45\u62f7\u8d1d\uff0c\u4e0d\u4f1a\u751f\u6210\u65b0\u7684\u5bf9\u8c61,\u4f46\u662f\u7cfb\u7edf\u5c31\u4f1a\u5bf9\u539f\u6765\u7684\u5bf9\u8c61\u8fdb\u884cretain,\u6240\u4ee5\u6211\u4eec\u8981\u5bf9\u539f\u6765\u7684\u5bf9\u8c61\u8fdb\u884c\u4e00\u6b21<br \/>\n2.\u5982\u679c\u662f\u6df1\u62f7\u8d1d\uff0c\u4f1a\u751f\u6210\u65b0\u7684\u5bf9\u8c61,\u7cfb\u7edf\u4e0d\u4f1a\u5bf9\u539f\u6765\u7684\u5bf9\u8c61\u8fdb\u884cretain,\u4f46\u662f\u56e0\u4e3a\u751f\u6210\u4e86\u65b0\u7684\u5bf9\u8c61,\u6240\u4ee5\u6211\u4eec\u8981\u5bf9\u65b0\u7684\u5bf9\u8c61\u8fdb\u884crelease<br \/>\n<strong>\u5bf9\u4e8e\u6d45\u62f7\u8d1d\uff1a<\/strong>\u539f\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u5668+1\uff0c\u5fc5\u987b\u91ca\u653e\u539f\u5bf9\u8c61<\/p>\n<pre><code>NSString *srcStr = [[NSString alloc] initWithFormat:@\"www.1gcode.com\"];\nNSLog(@\"srcStr = %lu\", [srcStr retainCount]);\nNSString *copyStr = [srcStr copy];\nNSLog(@\"copyStr = %lu\", [copyStr retainCount]);\n[copyStr release]; \/\/ \u5fc5\u987b\u505a\u4e00\u6b21release\n<\/code><\/pre>\n<p><strong>\u5bf9\u4e8e\u6df1\u62f7\u8d1d\uff08\u5373\u6df1\u590d\u5236\uff09\uff1a<\/strong>\u65b0\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u5668+1\uff0c\u5fc5\u987b\u91ca\u653e\u65b0\u5bf9\u8c61<\/p>\n<pre><code>NSString *srcStr = [[NSString alloc] initWithFormat:@\"www.1gcode.com\"];\nNSLog(@\"srcStr = %lu\", [srcStr retainCount]);\nNSString *copyStr = [srcStr mutableCopy];\nNSLog(@\"copyStr = %lu\", [copyStr retainCount]);\n[copyStr release]; \/\/ \u5fc5\u987b\u505a\u4e00\u6b21release\n<\/code><\/pre>\n<\/blockquote>\n<ul>\n<li>\u5c0f\u7ed3<\/li>\n<\/ul>\n<blockquote><p>\n1.\u6d45\u62f7\u8d1d\u662f\u6307\u9488\u7684\u62f7\u8d1d\uff0c\u6df1\u62f7\u8d1d\u662f\u5730\u5740\u7684\u62f7\u8d1d<br \/>\n2.\u5c31\u662f\u6709\u53ef\u53d8\u7684\u5c31\u662f\u6df1\u62f7\u8d1d\uff1b\u6bd4\u5982[NSString mutableCopy]\u8fd9\u79cd\u5c31\u662f\u6df1\u62f7\u8d1d\uff0c[NSMutableString copy]\u4e5f\u662f\u6df1\u62f7\u8d1d<br \/>\n3.\u53ef\u53d8\u5c31\u662f\u8981\u4fdd\u7559\u539f\u6709\u7684\u5bf9\u8c61\uff0c\u64cd\u4f5ccopy\u51fa\u6765\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u7684\u6307\u9488\u6307\u5411\u4e24\u4e2a\u5730\u5740\uff1b\u8fd9\u6837\u505a\u76ee\u7684\u662f\u4fdd\u8bc1\u539f\u6765\u7684\u5bf9\u8c61\u4e0d\u88ab\u4fee\u6539\uff08\u5982\u679c\u4f60\u539f\u6765\u7684\u5bf9\u8c61\u90fd\u6539\u4e86\uff0c\u4f60\u539f\u6765\u7684\u5bf9\u8c61\u672c\u6765\u8981\u5e72\u7684\u4e1c\u897f\u5c31\u5e72\u4e0d\u4e86\u4e86\uff09<br \/>\n4.\u6d45\u62f7\u8d1d\u4e0d\u4f1a\u62f7\u8d1d\u5730\u5740\u53ea\u4f1a\u62f7\u8d1d\u6307\u9488\uff0c\u5982\u679c\u4f60\u8981\u4fee\u6539\u5bf9\u8c61\u7684\u5185\u5bb9\uff0c\u90a3\u4f60\u4ee5\u524d\u7684\u90a3\u4e2a\u5bf9\u8c61\u4e5f\u88ab\u4fee\u6539\u4e86<br \/>\n5.\u6d45\u590d\u5236\u597d\u6bd4\u4f60\u548c\u4f60\u7684\u5f71\u5b50\uff0c\u4f60\u5b8c\u86cb\uff0c\u4f60\u7684\u5f71\u5b50\u4e5f\u5b8c\u86cb\uff1b\u6df1\u590d\u5236\u597d\u6bd4\u4f60\u548c\u4f60\u7684\u514b\u9686\u4eba\uff0c\u4f60\u5b8c\u86cb\uff0c\u4f60\u7684\u514b\u9686\u4eba\u8fd8\u6d3b\u7740\n<\/p><\/blockquote>\n<ul>\n<li>\u5982\u4f55\u5224\u65ad\u6d45\u62f7\u8d1d\u3001\u6df1\u62f7\u8d1d\uff1f<\/li>\n<\/ul>\n<blockquote><p>\n\u6df1\u6d45\u62f7\u8d1d\u53d6\u51b3\u4e8e\u62f7\u8d1d\u540e\u7684\u5bf9\u8c61\u7684\u662f\u4e0d\u662f\u548c\u88ab\u62f7\u8d1d\u5bf9\u8c61\u7684\u5730\u5740\u76f8\u540c\uff1b<br \/>\n1.\u5982\u679c\u4e0d\u540c\uff0c\u5219\u4ea7\u751f\u4e86\u65b0\u7684\u5bf9\u8c61\uff0c\u5219\u6267\u884c\u7684\u662f\u6df1\u62f7\u8d1d\u3002<br \/>\n2.\u5982\u679c\u76f8\u540c\uff0c\u5219\u53ea\u662f\u6307\u9488\u62f7\u8d1d\uff0c\u76f8\u5f53\u4e8e retain \u4e00\u6b21\u539f\u5bf9\u8c61\uff0c\u6267\u884c\u7684\u662f\u6d45\u62f7\u8d1d\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 698px; max-height: 167px;\">\n<div class=\"image-view\" data-width=\"698\" data-height=\"167\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-041b091b1906bef0e8446b4823947a62.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u5982\u4f55\u5224\u65ad\u6d45\u62f7\u8d1d\u3001\u6df1\u62f7\u8d1d\uff1f\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u7684\u5224\u65ad\u8981\u6ce8\u610f\u4e24\u70b9\uff1a\u6e90\u5bf9\u8c61\u7c7b\u578b\u662f\u5426\u662f\u53ef\u53d8\u7684\u3001\u6267\u884c\u7684\u62f7\u8d1d\u662f copy \u8fd8\u662f mutableCopy<\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 398px;\">\n<div class=\"image-view\" data-width=\"795\" data-height=\"398\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-25b1e2f2d47c67d5271f4b3d266a8b79.png\"><\/div>\n<\/div>\n<div class=\"image-caption\">\u533a\u5206\u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d<\/div>\n<\/div>\n<ul>\n<li>\u5982\u679c NSMutableArray \u7528 copy \u4fee\u9970\u53ef\u4ee5\u4e0d\u53ef\u4ee5\uff1f<\/li>\n<\/ul>\n<blockquote><p>\n\u5f53 copy \u4fee\u9970\u53ef\u53d8\u7c7b\u578b\u96c6\u5408\uff08\u4f8b\u5982\uff1aNSMutableArray\uff09\u65f6\uff0c\u8d4b\u503c\u540e\uff0c\u4f1a\u5bfc\u81f4\u53ef\u53d8\u7c7b\u578b\u5c5e\u6027\u53d8\u4e3a\u4e0d\u53ef\u53d8\u7c7b\u578b\uff0c\u7136\u540e\u5728\u8c03\u7528\u53ef\u53d8\u7c7b\u578b\u65b9\u6cd5\u65f6\uff0c\u4f1a\u4ea7\u751f\u5f02\u5e38\u9519\u8bef\u3002\u4ea7\u751f\u5f02\u5e38\u7684\u539f\u56e0\u662f copy \u5c5e\u6027\u5728\u8fd0\u884c\u65f6\u8d4b\u503c\u65f6\u8c03\u7528\u4e86 -copyWithZone: \u8d4b\u503c\uff0c\u5c06\u53ef\u53d8\u7c7b\u578b\u8f6c\u6362\u4e3a\u4e0d\u53ef\u53d8\u7c7b\u578b\u3002<br \/>\n<strong>\u8865\u5145\u8bf4\u660e\uff1a<\/strong><br \/>\n\u6bd4\u5982\u8fd9\u4e2a\u5199\u6cd5\uff1a@property (nonatomic, copy) NSMutableArray *array;  \u5982\u679c\u4f7f\u7528\u8fd9\u4e2a array \u4f1a\u95ea\u9000\uff0c\u56e0\u4e3a copy \u51fa\u6765\u7684\u662f\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u6570\u7ec4\u3002\u6bd4\u5982\u8c03\u7528\u7684\u65f6\u5019\u662f\u6dfb\u52a0\u5143\u7d20\uff0c\u90a3\u4e48\u9519\u8bef\u4f1a\u662f\u6570\u7ec4\u627e\u4e0d\u5230\u6dfb\u52a0\u5143\u7d20\u7684\u65b9\u6cd5\uff0c\u6240\u4ee5\u4f1a\u95ea\u9000\u3002\n<\/p><\/blockquote>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 464px;\">\n<div class=\"image-view\" data-width=\"1200\" data-height=\"795\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-30a36acc6fa864f55d203fe4ab4c1dde.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 525px;\">\n<div class=\"image-view\" data-width=\"1200\" data-height=\"899\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-a2be9eff5f9e92c6c71c8fbc2867db79.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 526px;\">\n<div class=\"image-view\" data-width=\"802\" data-height=\"526\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-e3d3a45083e174a809f4e857d4f0921a.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<div class=\"image-package\">\n<div class=\"image-container\" style=\"max-width: 700px; max-height: 443px;\">\n<div class=\"image-view\" data-width=\"1200\" data-height=\"443\"><img decoding=\"async\" src=\"https:\/\/me.websighte.com\/wp-content\/uploads\/2024\/11\/frc-2bde4d6f7eb28e93fb80b38876c05589.png\"><\/div>\n<\/div>\n<div class=\"image-caption\"><\/div>\n<\/div>\n<ul>\n<li>block \u53d8\u91cf\u5b9a\u4e49\u65f6\u4e3a\u4ec0\u4e48\u7528 copy\uff1fblock \u662f\u653e\u5728\u54ea\u91cc\u7684\uff1f<\/li>\n<\/ul>\n<blockquote><p>\n\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cblock \u662f\u5b58\u6863\u5728\u6808\u4e2d\uff0c\u53ef\u80fd\u88ab\u968f\u65f6\u56de\u6536\uff0c\u901a\u8fc7 copy \u64cd\u4f5c\u53ef\u4ee5\u4f7f\u5176\u5728\u5806\u4e2d\u4fdd\u7559\u4e00\u4efd, \u76f8\u5f53\u4e8e\u4e00\u76f4\u5f3a\u5f15\u7528\u7740\uff0c\u56e0\u6b64\u5982\u679c block \u4e2d\u7528\u5230 self \u65f6\u9700\u8981\u5c06\u5176\u5f31\u5316\uff0c\u901a\u8fc7 __weak \u6216\u8005 __unsafe_unretained\u3002\n<\/p><\/blockquote>\n<ul>\n<li>copy \u4e0e @property<\/li>\n<\/ul>\n<blockquote><p>\n1.@property\u4f7f\u7528copy\u53ef\u4ee5\u9632\u6b62\u5916\u754c\u4fee\u6539\u5185\u90e8\u7684\u6570\u636e<br \/>\n2.\u53ef\u4ee5\u4f7f\u7528copy\u4fdd\u5b58block, \u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u5728block\u4e2d\u4f7f\u7528\u7684\u5916\u754c\u5bf9\u8c61\u7684\u65f6\u5019, \u5916\u754c\u7684\u5bf9\u8c61\u5df2\u7ecf\u91ca\u653e\u51fa\u73b0\u7684\u91ce\u6307\u9488\u9519\u8bef<br \/>\n3.\u6ce8\u610f: copy block\u53ef\u80fd\u4f1a\u5f15\u53d1\u5faa\u73af\u5f15\u7528\uff0c\u5982\u679c\u5bf9\u8c61\u4e2d\u7684block\u53c8\u7528\u5230\u4e86\u5bf9\u8c61\u81ea\u5df1, \u90a3\u4e48\u4e3a\u4e86\u907f\u514d\u5185\u5b58\u6cc4\u9732, \u5e94\u8be5\u5c06\u5bf9\u8c61\u4fee\u9970\u4e3a__block\n<\/p><\/blockquote>\n<ul>\n<li>\u8865\u5145\uff1ablock \u5185\u5b58\u76f8\u5173<\/li>\n<\/ul>\n<blockquote>\n<ul>\n<li>\n<p>__block \u4ec0\u4e48\u65f6\u5019\u7528\uff1f<br \/>\n\u5728 block \u91cc\u9762\u4fee\u6539\u5c40\u90e8\u53d8\u91cf\u7684\u503c\u90fd\u8981\u7528 __block \u4fee\u9970<\/p>\n<\/li>\n<li>\n<p>\u5728 block \u91cc\u9762\uff0c\u5bf9\u6570\u7ec4\u6267\u884c\u6dfb\u52a0\u64cd\u4f5c\uff0c\u8fd9\u4e2a\u6570\u7ec4\u9700\u8981\u58f0\u660e\u6210 __block \u5417?<br \/>\n\u4e0d\u9700\u8981\u58f0\u660e\u6210 __block\uff0c\u56e0\u4e3a testArr \u6570\u7ec4\u7684\u6307\u9488\u5e76\u6ca1\u6709\u53d8\u3002\u5f80\u6570\u7ec4\u91cc\u9762\u6dfb\u52a0\u5bf9\u8c61\uff0c\u6307\u9488\u662f\u6ca1\u53d8\u7684\uff0c\u53ea\u662f\u6307\u9488\u6307\u5411\u7684\u5185\u5b58\u91cc\u9762\u7684\u5185\u5bb9\u53d8\u4e86\u3002<\/p>\n<\/li>\n<li>\n<p>\u5728block \u91cc\u9762\u5bf9 NSInteger \u8fdb\u884c\u4fee\u6539\uff0c\u8fd9\u4e2a NSInteger \u662f\u5426\u9700\u8981\u58f0\u660e\u6210 __blcok\uff1f<br \/>\nNSInteger \u7684\u503c\u53d1\u751f\u6539\u53d8\uff0c\u5219\u8981\u6c42\u6dfb\u52a0 __block \u4fee\u9970\u3002<\/p>\n<\/li>\n<\/ul>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\u76ee\u5f55 1.\u5185\u5b58\u533a\u57df\u89e3\u6790 2.\u4ec0\u4e48\u662f\u5f15\u7528\u8ba1\u6570\uff08retainCount\uff09 3.\u4ec0\u4e48\u662f\u6307\u9488\u548c\u5730\u5740 4.\u5185\u5b58\u6cc4\u6f0f\u3001\u91ce\u6307\u9488\u3001\u7a7a\u6307\u9488\u3001\u50f5\u5c38\u5bf9\u8c61 5.\u5185\u5b58\u7ba1\u7406\u539f\u5219 6.\u5e38\u7528\u5185\u5b58\u4fee\u9970\u8bcd 7.alloc\u3001init\u3001new\u3001dealloc \u533a\u522b 8.\u5f3a\u5f15\u7528\u3001\u5f31\u5f15\u7528\u3001\u5faa\u73af\u5f15\u7528 9.weak\u8be6\u89e3 10.\u6df1\u6d45\u62f7\u8d1d\u7406\u89e3 https:\/\/blog.csdn.net\/z119901214\/article\/details\/82417153?spm=1001.2014.3001.5502 iOS\u5185\u5b58\u7ba1\u7406 1.\u5185\u5b58\u533a\u57df\u89e3\u6790 \u5e38\u8bf4\u7684\u5185\u5b58\u6709\u4e94\u5927\u533a\uff0c\u5206\u522b\u4e3a\uff1a\u5806\u533a\u3001\u6808\u533a\u3001\u5168\u5c40\u533a\uff08\u9759\u6001\u533a\uff09\u3001\u5e38\u91cf\u533a\u3001\u4ee3\u7801\u533a\uff0c\u5177\u4f53\u5982\u4e0b\u56fe\u3002 \u8865\u5145\u8bf4\u660e\uff1a 1.\u5185\u5bb9\u5206\u4e3a\u865a\u62df\u5185\u5b58+\u7269\u7406\u5185\u5b58\uff0c\u6b63\u5e38\u521d\u59cb\u5316\u7a7a\u95f4\u5206\u914d\u7684\u90fd\u662f\u865a\u62df\u5185\u5b58\uff0c\u521d\u59cb\u5316\u5b9e\u4f8b\u624d\u4f1a\u5360\u7528\u7269\u7406\u5185\u5bb9\u3002Instrument \u7684 Allocations \u5de5\u5177\u53ef\u4ee5\u76d1\u63a7\uff0cAll Heap &#038; Anoymous VM \u4ee3\u8868\u865a\u62df\u5185\u5b58 Dirty Memory\uff0cresident Size \u5c31\u662f\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\u3002 2.\u8bbf\u95ee\u5185\u5b58\u5176\u5b9e\u90fd\u662f\u8bbf\u95ee\u7684\u903b\u8f91\u5730\u5740\uff0c\u9700\u8981\u8f6c\u6362\u540e\u624d\u80fd\u8bbf\u95ee\u7269\u7406\u5185\u5b58\uff0c CPU\u6839\u636e\u903b\u8f91\u5730\u5740\u901a\u8fc7\u754c\u9650\u5bc4\u5b58\u5668\u5224\u65ad\u662f\u5426\u8d8a\u754c\uff0c\u8d8a\u754c\u5730\u5740\u9519\u8bef\uff0c\u53cd\u4e4b\u52a0\u4e0a\u57fa\u5740\u5bc4\u5b58\u5668\u8f6c\u6362\u6210\u7269\u7406\u5185\u5b58\u5730\u5740\u3002 3.iOS \u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u4e3b\u8981\u6709\u4e24\u7c7b\uff1a \u4e00\u7c7b\u662f\u503c\u7c7b\u578b\uff1b\u6bd4\u5982 int\u3001float\u3001struct \u7b49\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u503c\u7c7b\u578b\u4f1a\u88ab\u653e\u5165\u6808\u4e2d\uff0c\u9075\u5faa\u5148\u8fdb\u540e\u51fa\u7684\u539f\u5219\u3002 \u4e00\u7c7b\u662f\u5f15\u7528\u7c7b\u578b\uff1b\u4e5f\u5c31\u662f\u7ee7\u627f NSObject \u7c7b\u7684\u6240\u6709 OC \u5bf9\u8c61\u3002\u5f15\u7528\u7c7b\u578b\u4f1a\u653e\u5728\u5806\u4e2d\uff0c\u5f53\u7ed9\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u7a7a\u95f4\u65f6\uff0c\u5bf9\u968f\u673a\u5728\u5185\u5b58\u4e2d\u5f00\u8f9f\u7a7a\u95f4\u3002 iOS \u5185\u5b58\u8fc7\u591a\u800c\u88ab Kill \u6389\uff1f\u57fa\u4e8e\u4ec0\u4e48\u539f\u5219\uff1f iOS \u4f7f\u7528\u7684\u662f\u4f4e\u5185\u5b58\u5904\u7406\u673a\u5236 Jetsam\uff0c\u57fa\u4e8e\u4f18\u5148\u7ea7\u961f\u5217\u7684\u673a\u5236\u3002 \u5f53\u5185\u5b58\u8fc7\u4f4e\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u5728\u961f\u5217\u4e2d\u8fdb\u884c\u5e7f\u64ad\uff0c\u5e0c\u671b\u5927\u5bb6\u5c3d\u91cf\u91ca\u653e\u5185\u5b58\uff0c\u5982\u679c\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u4ecd\u7136\u5185\u5b58\u4e0d\u591f\uff0c\u5c31\u4f1a\u5f00\u59cb Kill \u8fdb\u7a0b\uff0c\u76f4\u5230\u5185\u5b58\u591f\u7528\u3002 \u5176\u4ed6\u76f8\u5173\u8865\u5145\u8bf4\u660e\uff1a 1.RAM\uff1a\u8fd0\u884c\u5185\u5b58\uff0c\u4e0d\u80fd\u6389\u7535\u5b58\u50a8\u3002ROM\uff1a\u5b58\u50a8\u6027\u5185\u5b58\uff0c\u53ef\u4ee5\u6389\u7535\u5b58\u50a8\uff0c\u4f8b\u5982\u5185\u5b58\u5361\u3001Flash\u3002\u7531\u4e8eRAM\u7c7b\u578b\u4e0d\u5177\u5907\u6389\u7535\u5b58\u50a8\u80fd\u529b\u5373\u4e00\u6389\u7535\u6570\u636e\u6d88\u5931\uff0c\u6240\u4ee5app\u7a0b\u5e8f\u4e00\u822c\u5b58\u653e\u4e8eROM\u4e2d\u3002RAM\u7684\u8bbf\u95ee\u901f\u5ea6\u8981\u8fdc\u9ad8\u4e8eROM\uff0c\u4ef7\u683c\u4e5f\u8981\u9ad8\u3002 2.App\u7a0b\u5e8f\u542f\u52a8\uff1aApp\u7a0b\u5e8f\u542f\u52a8\uff0c\u7cfb\u7edf\u4f1a\u628a\u5f00\u542f\u7684\u90a3\u4e2aApp\u7a0b\u5e8f\u4eceFlash\u6216ROM\u91cc\u9762\u62f7\u8d1d\u5230\u5185\u5b58\uff08RAM\uff09\uff0c\u7136\u540e\u4ece\u5185\u5b58\u91cc\u9762\u6267\u884c\u4ee3\u7801\u3002\u53e6\u4e00\u4e2a\u539f\u56e0\u662fCPU\u4e0d\u80fd\u76f4\u63a5\u4ece\u5185\u5b58\u5361\u91cc\u9762\u8bfb\u53d6\u6307\u4ee4\uff08\u9700\u8981Flash\u9a71\u52a8\u7b49\u7b49\uff09\u3002 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