“`”<\/p>\n
ios5\u4e4b\u524d\u662fMRC\uff0c\u5185\u5b58\u9700\u8981\u7a0b\u5e8f\u5458\u8fdb\u884c\u7ba1\u7406\uff0cios5\u4e4b\u540e\u662fARC\uff0c\u9664\u975e\u7279\u6b8a\u60c5\u51b5\uff0c\u6bd4\u5982C\u6846\u67b6\u6216\u8005\u5faa\u73af\u5f15\u7528\uff0c\u5176\u4ed6\u65f6\u5019\u662f\u4e0d\u9700\u8981\u7a0b\u5e8f\u5458\u624b\u52a8\u7ba1\u7406\u5185\u5b58\u7684\u3002
\n ios\u4e2d\u5f53\u6211\u4eec\u5b9a\u4e49\u5c5e\u6027@property\u7684\u65f6\u5019\u5c31\u9700\u8981\u5c5e\u6027\u4fee\u9970\u7b26\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u770b\u4e00\u4e0b\u4e0d\u540c\u5c5e\u6027\u4fee\u9970\u7b26\u7684\u4f5c\u7528\u3002\u6709\u9519\u8bef\u548c\u4e0d\u8db3\u7684\u5730\u65b9\u8fd8\u8bf7\u5927\u5bb6\u8c05\u89e3\u5e76\u6279\u8bc4\u6307\u6b63\u3002<\/p>\n
\u4e3b\u8981\u7684\u5c5e\u6027\u4fee\u9970\u7b26\u6709\u4e0b\u9762\u51e0\u79cd\uff1a<\/p>\n
<ul>
\n<li>copy<\/li>
\n<li>assign<\/li>
\n<li>retain<\/li>
\n<li>strong<\/li>
\n<li>weak<\/li>
\n<li>readwrite\/readonly (\u8bfb\u5199\u7b56\u7565\u3001\u8bbf\u95ee\u6743\u9650)<\/li>
\n<li>nonatomic\/atomic (\u5b89\u5168\u7b56\u7565)<\/li>
\n<\/ul><\/p>\n
\u5982\u679c\u4ee5MRC\u548cARC\u8fdb\u884c\u533a\u5206\u4fee\u9970\u7b26\u4f7f\u7528\u60c5\u51b5\uff0c\u53ef\u4ee5\u6309\u7167\u5982\u4e0b\u65b9\u5f0f\u8fdb\u884c\u5206\u7ec4\uff1a<\/p>\n
\u00a0<\/p>\n
<pre><code class=""language-objectivec"" lang=""objectivec""> 1. MRC: assign\/ retain\/ copy\/ readwrite\u3001readonly\/ nonatomic\u3001atomic \u7b49\u3002
\n 2. ARC: assign\/ strong\/ weak\/ copy\/ readwrite\u3001readonly\/ nonatomic\u3001atomic \u7b49\u3002
\n<\/code><\/pre><\/p>\n
\u5c5e\u6027\u4fee\u9970\u7b26\u5bf9retainCount\u8ba1\u6570\u7684\u5f71\u54cd\u3002<\/p>\n
<ol start="""">
\n<li>alloc\u4e3a\u5bf9\u8c61\u5206\u914d\u5185\u5b58\uff0cretainCount \u4e3a1 \u3002<\/li>
\n<li>retain MRC\u4e0b retainCount + 1\u3002<\/li>
\n<li>copy \u4e00\u4e2a\u5bf9\u8c61\u53d8\u6210\u65b0\u7684\u5bf9\u8c61\uff0cretainCount\u4e3a 1\uff0c \u539f\u6709\u7684\u5bf9\u8c61\u8ba1\u6570\u4e0d\u53d8\u3002<\/li>
\n<li>release \u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570 -1\u3002<\/li>
\n<li>autorelease \u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570 retainCount – 1\uff0c\u5982\u679c\u4e3a0\uff0c\u7b49\u5230\u6700\u8fd1\u4e00\u4e2apool\u7ed3\u675f\u65f6\u91ca\u653e\u3002<\/li>
\n<\/ol><\/p>\n
\u4e0d\u7ba1MRC\u8fd8\u662fARC\uff0c\u5176\u5b9e\u90fd\u662f\u770breference count\u662f\u5426\u4e3a0\uff0c\u5982\u679c\u4e3a0\u90a3\u4e48\u8be5\u5bf9\u8c61\u5c31\u88ab\u91ca\u653e\uff0c\u4e0d\u540c\u7684\u5730\u65b9\u662fMRC\u9700\u8981\u7a0b\u5e8f\u5458\u81ea\u5df1\u4e3b\u52a8\u53bb\u6dfb\u52a0retain \u548c release\uff0c\u800cARC apple\u5df2\u7ecf\u7ed9\u5927\u5bb6\u505a\u597d\uff0c\u81ea\u52a8\u7684\u5728\u5408\u9002\u7684\u5730\u65b9\u63d2\u5165retain \u548c release\u7c7b\u4f3c\u7684\u5185\u5b58\u7ba1\u7406\u4ee3\u7801\uff0c\u5177\u4f53\u539f\u7406\u5982\u4e0b\uff0c\u56fe\u7247\u6458\u81ea\u5b98\u65b9\u6587\u6863\u3002<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/\/\/upload-images.jianshu.io\/upload_images\/3691932-2755b62e1b3700d0.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/691\/format\/webp""><\/p>\n
MRC \u548c ARC\u539f\u7406<\/p>\n
\u4e0b\u9762\u5c31\u8be6\u8ff0\u4e0a\u6240\u5217\u7684\u51e0\u79cd\u5c5e\u6027\u4fee\u9970\u7b26\u7684\u4f7f\u7528\u573a\u666f\uff0c\u5e94\u7528\u4e3e\u4f8b\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n
\u00a0<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” ios5\u4e4b\u524d\u662fMRC\uff0c\u5185\u5b58\u9700\u8981\u7a0b\u5e8f\u5458\u8fdb\u884c\u7ba1\u7406\uff0cios5\u4e4b\u540e\u662fARC\uff0c\u9664\u975e\u7279\u6b8a\u60c5 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-42441","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=42441"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42441\/revisions"}],"predecessor-version":[{"id":42442,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42441\/revisions\/42442"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=42441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=42441"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=42441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}