“`” strong\u8868\u793a\u6307\u5411\u5e76\u62e5\u6709\u8be5\u5bf9\u8c61\u3002\u5176\u4fee\u9970\u7684\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u4f1a\u589e\u52a01\u3002\u8be5\u5bf9\u8c61\u53ea\u8981\u5f15\u7528\u8ba1\u6570\u4e0d\u4e3a0\u5219\u4e0d\u4f1a\u88ab\u9500\u6bc1\u3002\u5f53\u7136\u5f3a\u884c\u5c06\u5176\u8bbe\u4e3anil\u53ef\u4ee5\u9500\u6bc1\u5b83\u3002<\/p>\n
weak\u8868\u793a\u6307\u5411\u4f46\u4e0d\u62e5\u6709\u8be5\u5bf9\u8c61\u3002\u5176\u4fee\u9970\u7684\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u4e0d\u4f1a\u589e\u52a0\u3002\u65e0\u9700\u624b\u52a8\u8bbe\u7f6e\uff0c\u8be5\u5bf9\u8c61\u4f1a\u81ea\u884c\u5728\u5185\u5b58\u4e2d\u9500\u6bc1\u3002<\/p>\n
assign\u4e3b\u8981\u7528\u4e8e\u4fee\u9970\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5982NSInteger\u548cCGFloat\uff0c\u8fd9\u4e9b\u6570\u503c\u4e3b\u8981\u5b58\u5728\u4e8e\u6808\u4e0a\u3002<\/p>\n
weak \u4e00\u822c\u7528\u6765\u4fee\u9970\u5bf9\u8c61\uff0cassign\u4e00\u822c\u7528\u6765\u4fee\u9970\u57fa\u672c\u6570\u636e\u7c7b\u578b\u3002\u539f\u56e0\u662fassign\u4fee\u9970\u7684\u5bf9\u8c61\u88ab\u91ca\u653e\u540e\uff0c\u6307\u9488\u7684\u5730\u5740\u4f9d\u7136\u5b58\u5728\uff0c\u9020\u6210\u91ce\u6307\u9488\uff0c\u5728\u5806\u4e0a\u5bb9\u6613\u9020\u6210\u5d29\u6e83\u3002\u800c\u6808\u4e0a\u7684\u5185\u5b58\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5904\u7406\uff0c\u4e0d\u4f1a\u9020\u6210\u91ce\u6307\u9488\u3002<\/p>\n
copy\u4e0estrong\u7c7b\u4f3c\u3002\u4e0d\u540c\u4e4b\u5904\u662fstrong\u7684\u590d\u5236\u662f\u591a\u4e2a\u6307\u9488\u6307\u5411\u540c\u4e00\u4e2a\u5730\u5740\uff0c\u800ccopy\u7684\u590d\u5236\u6bcf\u6b21\u4f1a\u5728\u5185\u5b58\u4e2d\u62f7\u8d1d\u4e00\u4efd\u5bf9\u8c61\uff0c\u6307\u9488\u6307\u5411\u4e0d\u540c\u5730\u5740\u3002copy\u4e00\u822c\u7528\u5728\u4fee\u9970\u6709\u53ef\u53d8\u5bf9\u5e94\u7c7b\u578b\u7684\u4e0d\u53ef\u53d8\u5bf9\u8c61\u4e0a\uff0c\u5982NSString, NSArray, NSDictionary\u3002<\/p>\n
Objective-C \u4e2d\uff0c\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u5173\u952e\u5b57\u662fatomic, readwrite, assign\uff1b\u666e\u901a\u5c5e\u6027\u7684\u9ed8\u8ba4\u5173\u952e\u5b57\u662fatomic, readwrite, strong\u3002<\/p><\/p>\n
<hr><\/p>\n
1\u3001\u5c5e\u6027readwrite\uff0creadonly\uff0cassign\uff0cretain\uff0ccopy\uff0cnonatomic \u5404\u81ea\u4ec0\u4e48\u4f5c\u7528\uff0c\u4ed6\u4eec\u5728\u90a3\u79cd\u60c5\u51b5\u4e0b\u7528?<\/p>\n
\u00a0<\/p>\n
<pre><code class=""language-objectivec"" lang=""objectivec""> readwrite\uff1a\u9ed8\u8ba4\u7684\u5c5e\u6027\uff0c\u53ef\u8bfb\u53ef\u5199\uff0c\u751f\u6210setter\u548cgetter\u65b9\u6cd5\u3002<\/p>\n
readonly\uff1a\u53ea\u8bfb\uff0c\u53ea\u751f\u6210getter\u65b9\u6cd5\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e0d\u80fd\u4fee\u6539\u53d8\u91cf\u3002<\/p>\n
assign\uff1a\u7528\u4e8e\u58f0\u660e\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff08int\u3001float\uff09\u4ec5\u8bbe\u7f6e\u53d8\u91cf\uff0c\u662f\u8d4b\u503c\u5c5e\u6027\u3002<\/p>\n
retain\uff1a\u6301\u6709\u5c5e\u6027\uff0csetter\u65b9\u6cd5\u5c06\u4f20\u5165\u7684\u53c2\u6570\u5148\u4fdd\u7559,\u518d\u8d4b\u503c,\u4f20\u5165\u7684\u53c2\u6570 \u5f15\u7528\u8ba1\u6570retaincount \u4f1a\u52a01
\n<\/code><\/pre><\/p>\n
\u5728\u5806\u4e0a\u5f00\u8f9f\u4e00\u5757\u7a7a\u95f4\uff0c\u7528\u6307\u9488a\u6307\u5411\uff0c\u7136\u540e\u5c06\u6307\u9488a\u8d4b\u503c(assign)\u7ed9\u6307\u9488b\uff0c\u7b49\u4e8e\u662fa\u548cb\u540c\u65f6\u6307\u5411\u8fd9\u5757\u5806\u7a7a\u95f4\uff0c\u5f53a\u4e0d\u4f7f\u7528\u8fd9\u5757\u5806\u7a7a\u95f4\u7684\u65f6\u5019\uff0c\u662f\u5426\u8981\u91ca\u653e\u8fd9\u5757\u5806\u7a7a\u95f4\uff1f\u7b54\u6848\u662f\u80af\u5b9a\u8981\u7684\uff0c\u4f46\u662f\u8fd9\u4ef6\u5806\u7a7a\u95f4\u88ab\u91ca\u653e\u540e\uff0cb\u5c31\u6210\u4e86\u91ce\u6307\u9488\u3002<\/p>\n
\u5982\u4f55\u907f\u514d\u8fd9\u6837\u7684\u95ee\u9898\uff1f \u8fd9\u5c31\u5f15\u51fa\u4e86\u5f15\u7528\u8ba1\u6570\u5668\uff0c\u5f53a\u6307\u9488\u8fd9\u5757\u5806\u7a7a\u95f4\u7684\u65f6\u5019\uff0c\u5f15\u7528\u8ba1\u6570\u5668+1\uff0c\u5f53b\u4e5f\u6307\u5411\u7684\u65f6\u5019\uff0c\u5f15\u7528\u8ba1\u6570\u5668\u53d8\u6210\u4e862\uff0c\u5f53a\u4e0d\u518d\u6307\u5411\u8fd9\u5757\u5806\u7a7a\u95f4\u65f6\uff0crelease-1\uff0c\u5f15\u7528\u8ba1\u6570\u5668\u4e3a1\uff0c\u5f53b\u4e5f\u4e0d\u6307\u5411\u8fd9\u5757\u5806\u7a7a\u95f4\u65f6\uff0crelease-1\uff0c\u5f15\u7528\u8ba1\u6570\u5668\u4e3a0\uff0c\u8c03\u7528dealloc\u51fd\u6570\uff0c\u7a7a\u95f4\u88ab\u91ca\u653e<\/p>\n
\u603b\u7ed3\uff1a\u5f53\u6570\u636e\u7c7b\u578b\u4e3aint\uff0cfloat\u539f\u751f\u7c7b\u578b\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528assign\u3002\u5982\u679c\u662f\u4e0a\u9762\u90a3\u79cd\u60c5\u51b5\uff08\u5bf9\u8c61\uff09\u5c31\u662f\u7528retain\u3002<\/p>\n
copy\uff1a\u662f\u8d4b\u503c\u7279\u6027,setter\u65b9\u6cd5\u5c06\u4f20\u5165\u5bf9\u8c61\u8d4b\u503c\u4e00\u4efd;\u9700\u8981\u5b8c\u5168\u4e00\u4efd\u65b0\u7684\u53d8\u91cf\u65f6,\u76f4\u63a5\u4ece\u5806\u533a\u62ff\u3002<\/p>\n
\u5f53\u5c5e\u6027\u662f NSString\u3001NSArray\u3001NSDictionary\u65f6\uff0c\u65e2\u53ef\u4ee5\u7528strong \u4fee\u9970\uff0c\u4e5f\u53ef\u4ee5\u7528copy\u4fee\u9970\u3002\u5f53\u7528strong\u4fee\u9970\u7684NSString \u6307\u5411\u4e00\u4e2aNSMutableString\u65f6\uff0c\u5982\u679c\u5728\u4e0d\u77e5\u60c5\u7684\u60c5\u51b5\u4e0b\u8fd9\u4e2aNSMutableString\u7684\u522b\u7684\u5f15\u7528\u4fee\u6539\u4e86\u503c\uff0c\u5c31\u4f1a\u51fa\u73b0\uff1a\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u5b57\u7b26\u4e32\u5374\u88ab\u6539\u53d8\u4e86\u7684\u60c5\u51b5\uff0c \u4f7f\u7528copy\u5c31\u4e0d\u4f1a\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\u3002<\/p>\n
\u00a0<\/p>\n
<pre><code class=""language-objectivec"" lang=""objectivec"">nonatomic\uff1a\u975e\u539f\u5b50\u6027\uff0c\u53ef\u4ee5\u591a\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u6548\u7387\u9ad8\u3002
\natomic\uff1a\u539f\u5b50\u6027\uff0c\u5c5e\u6027\u5b89\u5168\u7ea7\u522b\u7684\u8868\u793a\uff0c\u540c\u4e00\u65f6\u523b\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u5177\u6709\u8d44\u6e90\u7684\u72ec\u5360\u6027\uff0c\u4f46\u662f\u6548\u7387\u5f88\u4f4e\u3002
\nstrong\uff1a\u5f3a\u5f15\u7528\uff0c\u5f15\u7528\u8ba1\u6570+ 1\uff0cARC\u4e0b\uff0c\u4e00\u4e2a\u5bf9\u8c61\u5982\u679c\u6ca1\u6709\u5f3a\u5f15\u7528\uff0c\u7cfb\u7edf\u5c31\u4f1a\u91ca\u653e\u8fd9\u4e2a\u5bf9\u8c61\u3002
\nweak\uff1a\u5f31\u5f15\u7528\uff0c\u4e0d\u4f1a\u4f7f\u5f15\u7528\u8ba1\u6570+1.\u5f53\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61\u7684\u5f3a\u5f15\u7528\u90fd\u88ab\u91ca\u653e\u65f6\uff0c\u8fd9\u5757\u7a7a\u95f4\u4f9d\u65e7\u4f1a\u88ab\u91ca\u653e\u6389\u3002
\n<\/code><\/pre><\/p>\n
\u4f7f\u7528\u573a\u666f\uff1a\u5728ARC\u4e0b\uff0c\u5982\u679c\u4f7f\u7528XIB \u6216\u8005SB \u6765\u521b\u5efa\u63a7\u4ef6\uff0c\u5c31\u4f7f\u7528 weak\u3002\u7eaf\u4ee3\u7801\u521b\u5efa\u63a7\u4ef6\u65f6\uff0c\u7528strong\u4fee\u9970\uff0c\u5982\u679c\u60f3\u7528weak \u4fee\u9970\uff0c\u5c31\u9700\u8981\u5148\u521b\u5efa\u63a7\u4ef6\uff0c\u7136\u540e\u8d4b\u503c\u7ed9\u7528weak\u4fee\u9970\u7684\u5bf9\u8c61\u3002<\/p>\n
\u67e5\u627e\u4e86\u4e00\u4e9b\u8d44\u6599\uff0c\u53d1\u73b0\u4e3b\u8981\u539f\u56e0\u662f\uff0ccontroller\u9700\u8981\u62e5\u6709\u5b83\u81ea\u5df1\u7684view\uff08\u8fd9\u4e2aview\u662f\u6240\u4ee5\u5b50\u63a7\u4ef6\u7684\u7236view\uff09\uff0c\u56e0\u6b64viewcontroller\u5bf9view\u5c31\u5fc5\u987b\u662f\u5f3a\u5f15\u7528\uff08strong reference\uff09,\u5f97\u7528strong\u4fee\u9970view\u3002\u5bf9\u4e8elable\uff0c\u5b83\u7684\u7236view\u662fview\uff0cview\u9700\u8981\u62e5\u6709label\uff0c\u4f46\u662fcontroller\u662f\u4e0d\u9700\u8981\u62e5\u6709label\u7684\u3002\u5982\u679c\u7528strong\u4fee\u9970\uff0c\u5728view\u9500\u6bc1\u7684\u60c5\u51b5\u4e0b\uff0clabel\u8fd8\u4ecd\u7136\u5360\u6709\u5185\u5b58\uff0c\u56e0\u4e3acontroller\u8fd8\u5bf9\u5b83\u5f3a\u5f15\u7528\uff1b\u5982\u679c\u7528wak\u4fee\u9970\uff0c\u5728view\u9500\u6bc1\u7684\u65f6label\u7684\u5185\u5b58\u4e5f\u540c\u65f6\u88ab\u9500\u6bc1\uff0c\u907f\u514d\u4e86\u50f5\u5c38\u6307\u9488\u51fa\u73b0\u3002<\/p>\n
\u7528\u5f15\u7528\u8ba1\u6570\u56de\u7b54\u5c31\u662f\uff1a\u56e0\u4e3aController\u5e76\u4e0d\u76f4\u63a5\u201c\u62e5\u6709\u201d\u63a7\u4ef6\uff0c\u63a7\u4ef6\u7531\u5b83\u7684\u7236view\u201c\u62e5\u6709\u201d\u3002\u4f7f\u7528weak\u5173\u952e\u5b57\u53ef\u4ee5\u4e0d\u589e\u52a0\u63a7\u4ef6\u5f15\u7528\u8ba1\u6570\uff0c\u786e\u4fdd\u63a7\u4ef6\u4e0e\u7236view\u6709\u76f8\u540c\u7684\u751f\u547d\u5468\u671f\u3002\u63a7\u4ef6\u5728\u88abaddSubview\u540e\uff0c\u76f8\u5f53\u4e8e\u63a7\u4ef6\u5f15\u7528\u8ba1\u6570+1\uff1b\u7236view\u9500\u6bc1\u540e\uff0c\u6240\u6709\u7684\u5b50view\u5f15\u7528\u8ba1\u6570-1\uff0c\u5219\u53ef\u4ee5\u786e\u4fdd\u7236view\u9500\u6bc1\u65f6\u5b50view\u7acb\u5373\u9500\u6bc1\u3002weak\u7684\u63a7\u4ef6\u5728removeFromSuperview\u540e\u4e5f\u4f1a\u7acb\u5373\u9500\u6bc1\uff0c\u800cstrong\u7684\u63a7\u4ef6\u4e0d\u4f1a\uff0c\u56e0\u4e3aController\u8fd8\u4fdd\u6709\u63a7\u4ef6\u5f3a\u5f15\u7528\u3002<\/p>\n
\u603b\u7ed3\u5f52\u7eb3\u4e3a\uff1a\u5f53\u63a7\u4ef6\u7684\u7236view\u9500\u6bc1\u65f6\uff0c\u5982\u679c\u4f60\u8fd8\u60f3\u7ee7\u7eed\u62e5\u6709\u8fd9\u4e2a\u63a7\u4ef6\uff0c\u5c31\u7528srtong\uff1b\u5982\u679c\u60f3\u4fdd\u8bc1\u63a7\u4ef6\u548c\u7236view\u62e5\u6709\u76f8\u540c\u7684\u751f\u547d\u5468\u671f\uff0c\u5c31\u7528weak\u3002\u5f53\u7136\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u7528\u4e24\u4e2a\u90fd\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n
\u4f7f\u7528weak\u7684\u65f6\u5019\u9700\u8981\u7279\u522b\u6ce8\u610f\u7684\u662f\uff1a\u5148\u5c06\u63a7\u4ef6\u6dfb\u52a0\u5230superview\u4e0a\u4e4b\u540e\u518d\u8d4b\u503c\u7ed9self\uff0c\u907f\u514d\u63a7\u4ef6\u88ab\u8fc7\u65e9\u91ca\u653e\u3002<\/p>\n
\u00a0<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” strong\u8868\u793a\u6307\u5411\u5e76\u62e5\u6709\u8be5\u5bf9\u8c61\u3002\u5176\u4fee\u9970\u7684\u5bf9\u8c61\u5f15\u7528\u8ba1\u6570\u4f1a\u589e\u52a01\u3002\u8be5\u5bf9\u8c61\u53ea\u8981\u5f15\u7528 […]<\/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-42405","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42405","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=42405"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42405\/revisions"}],"predecessor-version":[{"id":42406,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42405\/revisions\/42406"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=42405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=42405"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=42405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}