{"id":1553,"date":"2013-06-09T15:55:02","date_gmt":"2013-06-09T07:55:02","guid":{"rendered":"http:\/\/me.doucl.com\/?p=1553"},"modified":"2013-06-09T15:57:35","modified_gmt":"2013-06-09T07:57:35","slug":"object-c-property","status":"publish","type":"post","link":"https:\/\/blog.vimge.com\/archives\/mobile\/object-c-property.html","title":{"rendered":"Object-C \u5c5e\u6027\u4fee\u9970\u7b26\u4f7f\u7528\u7965\u89e3"},"content":{"rendered":"<p>Object-C\u5c5e\u6027\u5b9a\u4e49@property\u4fee\u9970\u7b26\u4e3b\u8981\u6709<\/p>\n<ul>\n<li>atomic<\/li>\n<li>nonatomic<\/li>\n<li>readonly<\/li>\n<li>readwrite<\/li>\n<li>assign<\/li>\n<li>retain<\/li>\n<li>copy<\/li>\n<li>getter<\/li>\n<li>setter<\/li>\n<\/ul>\n<div>\u5b83\u4eec\u4e4b\u95f4\u53ef\u4ee5\u7ec4\u5408\u4f7f\u7528\uff0c\u591a\u4e2a\u4fee\u9970\u7b26\u7528\u9017\u53f7\u5206\u9694\uff0c\u5f53\u7136\u4e92\u65a5\u7684\u9664\u5916\u3002\u58f0\u660e\u5c5e\u6027\u65f6\u53ef\u4ee5\u4e0d\u5fc5\u6307\u5b9a\u4fee\u9970\u7b26\uff0c\u6ca1\u6709\u6307\u5b9a\u4fee\u6539\u7b26\u7684\u7f16\u8f91\u65f6\u4f7f\u7528\u9ed8\u8ba4\u53c2\u6570\u3002<\/div>\n<div>\u4e0b\u9762\u5c06\u5bf9\u5404\u4fee\u9970\u7b26\u4f5c\u7965\u7ec6\u4ecb\u7ecd\uff1a<\/div>\n<div>\n<ul>\n<li>atomic \u548c nonatomic, \u539f\u5b50\u8fd8\u662f\u975e\u539f\u5b50\u6027\u64cd\u4f5c\uff0c\u524d\u8005\u4e3a\u9ed8\u8ba4\uff0c\u8868\u793a\u5c5e \u6027\u662f\u539f\u5b50\u7684,\u652f\u6301\u591a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee(\u5b9e\u9645\u5c31\u662f setter \u7684\u5b9e\u73b0\u4e2d\u52a0\u5165\u4e86\u540c\u6b65\u9501),\u540e\u8005\u662f\u975e\u539f \u5b50\u7684,\u4e5f\u5c31\u662f\u9002\u5408\u5728\u975e\u591a\u7ebf\u7a0b\u7684\u73af\u5883\u63d0\u5347\u6548\u7387(\u56e0\u4e3a setter \u4e2d\u6ca1\u6709\u540c\u6b65\u9501\u7684\u4ee3\u7801)\u3002\u6ca1\u6709\u7279\u522b\u7684\u591a\u7ebf\u7a0b\u8981\u6c42\u7528 nonatomic \u6709\u52a9\u4e8e\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li>readonly, readwrite \u8868\u793a\u5c5e\u6027\u7684\u53ef\u8bfb\u5199\u7279\u6027<\/li>\n<li>retain, assign, copy \u9488\u5bf9\u5bf9\u8c61\u4f7f\u7528\uff0c\u6839\u636e\u00a0<span style=\"font-family: Consolas, Monaco, monospace; font-size: 12px; line-height: 18px;\">setter \u65b9\u6cd5\u5185\u90e8\u5b9e\u73b0\u65f6\u5bf9\u4f20\u5165\u7684\u5bf9\u8c61\u7684\u6301\u6709\u65b9\u5f0f\u3002retain \u4f1a\u589e\u52a0\u5f15\u7528\u8ba1\u6570\uff0c\u5f3a\u5f15\u7528\u7c7b\u578b, assign \u662f\u7ed9\u53d8\u91cf\u76f4\u63a5\u8d4b\u503c\uff0c\u5f31\u5f15\u7528\u7c7b\u578b\uff0c\u4e5f\u662f\u9ed8\u8ba4\u503c, copy \u662f\u628a setter \u7684\u53c2\u6570\u590d\u5236\u4e00\u4efd\u518d\u8d4b\u7ed9\u6210\u5458\u53d8\u91cf\u3002\u6ce8\u610f\u5b83\u4eec\u5bf9\u5f15\u7528\u8ba1\u6570\u4ea7\u751f\u7684\u5f71\u54cd\uff0c\u5982\u679c\u5916\u90e8\u4e0d\u518d\u4f7f\u7528\u7684\u8bdd\uff0c\u7528\u4e86 retain \u6216 copy \u8d4b\u503c\u7684\u53ef\u4ee5release \u6389\u90a3\u4e2a\u5bf9\u8c61\u3002<\/span><\/li>\n<li>\n<pre>getter=getterName \u548c setter=setterName, \u663e\u5f0f\u8bbe\u7f6e getter\/setter \u65b9\u6cd5\u540d, \u672a\u6307\u5b9a\u5b83\u4eec\u65f6 Objective-C \u4f1a\u4e3a\u6211\u4eec\u751f\u6210\u9ed8\u8ba4\u7684 setter\/getter \u65b9\u6cd5, \u6709\u4e00\u5b9a\u7684\u89c4\u5219\uff0c\r\n\u6bd4\u5982\u4e0a\u9762\u7684 NSString* gender \u5c5e\u6027\u751f\u6210\u9ed8\u8ba4\u7684setter \u65b9\u6cd5\u662f: -(void) setGender:(NSString *);\r\ngetter \u65b9\u6cd5\u662f: -(NSString *) gender;\r\n\u60f3\u770b\u770b Objective-C \u4e3a\u6211\u4eec\u751f\u6210\u4ec0\u4e48 getter\/setter \u65b9\u6cd5, \u4e0d\u7528\u70b9\u53f7\u6765\u9690\u5f0f\u8c03\u7528 setter\/getter \u65b9\u6cd5\uff0c\u800c\u662f\u663e\u5f0f\u7684\u7528 [unmi setGender] \u6216 [unmi gender], \u8f93\u5165\u5f0f\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u4f1a\u81ea\u52a8\u63d0\u793a\u51fa\u6765\u7684\u3002\u6ce8\u610f\u8fd9\u91cc\u7684 getter \u65b9\u6cd5\u540d\u5e76\u975e\u662f\u50cf Java \u7684 getGender, \u800c\u662f\u548c\u5c5e\u6027\u540d\u540c.\r\n\u5047\u5982\u4f60\u60f3\u8981\u81ea\u5df1\u4e2a\u6027\u7684 getter\/setter \u65b9\u6cd5\uff0c\u6bd4\u5982\u5199\u6210 @property(getter=getGender, setter=setSex:) NSString* gender; \u90a3\u4e48\u76f8\u5e94\u7684\u5c31\u4f1a\u751f\u6210\uff1a\r\n  setter \u65b9\u6cd5\u662f: -(void) setSex:(NSString *);\r\n  getter \u65b9\u6cd5\u662f: -(NSString *) getGender;\r\n\u5728 Xcode \u4e2d esc unmi \u5c31\u80fd\u770b\u5230\u76f8\u5e94\u7684 setter\/getter \u65b9\u6cd5\u540d\u7684. \u53ef\u4ee5\u53ea\u7528\u5176\u4e2d\u4e00\u4e2a\u4e86\uff0c\u90a3\u53e6\u4e00\u4e2a\u4fdd\u6301\u9ed8\u8ba4\u3002\u8fd9\u4e24\u4e2a\u8f83\u5c11\u7528\uff0c\u7528\u9014\u5c31\u662f\u53ef\u7528\u6765\u751f\u6210\u81ea\u5df1\u4e2a\u6027\u7684\u4f46\u8981\u7b26\u5408\u67d0\u4e2a\u8303\u56f4\u5185\u89c4\u8303\u7684 setter\/getter \u65b9\u6cd5\u3002\u50cf @property(getter = isOnline) BOOL online; \u5219\u4f1a\u751f\u6210 -(BOOL) isOnline; \u8fd9\u6837\u7684 getter \u65b9\u6cd5\uff0c\u800c\u4e0d\u662f -(BOOL) online; \u5f53\u7136\u6211\u4eec\u4e5f\u5f88\u5c11\u4e14\u4e0d\u63a8\u8350\u76f4\u63a5\u8c03\u7528 getter\/setter \u65b9\u6cd5\uff0c\u800c\u662f\u7528\u70b9\u53f7\u7684\u65b9\u5f0f\uff0c\u4f46\u662f\u6709\u610f\u601d\u7684\u53bb\u8986\u76d6 getter\/setter \u65b9\u6cd5\u65f6\u5c31\u8f83\u8c61\u660e\u786e\u4e86\u3002<\/pre>\n<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u4ec0\u4e48\u65f6\u5019\u7528assign\u3001\u4ec0\u4e48\u65f6\u5019\u7528retain\u548ccopy\u5462\uff1f<br \/>\n\u63a8\u8350\u505a\u6cd5\u662fNSString\u7528copy,delegate\u7528assign\uff08\u4e14\u4e00\u5b9a\u8981\u7528assign\uff0c\u4e0d\u8981\u95ee\u4e3a\u4ec0\u4e48\uff0c\u53ea\u7ba1\u53bb\u7528\u5c31\u662f\u4e86\uff0c\u4ee5\u540e\u4f60\u4f1a\u660e\u767d\u7684\uff09\uff0c\u975eobjc\u6570\u636e\u7c7b\u578b\uff0c\u6bd4\u5982int\uff0cfloat\u7b49\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7528assign\uff08\u9ed8\u8ba4\u5c31\u662fassign\uff09\uff0c\u800c\u5176\u5b83objc\u7c7b\u578b\uff0c\u6bd4\u5982NSArray\uff0cNSDate\u7528retain\u3002<\/p>\n<p>\u987a\u4fbf\u8bf4\u660e\u4e00\u4e0b@property \u4e2d\u7684 retain\/assign\/copy \u5bf9\u5e94 setter \u65b9\u6cd5\u7684\u5185\u90e8\u5b9e\u73b0\uff1a<\/p>\n<pre> \r\n\/\/retain \u65f6\uff1a\r\n-(void) setAddress: (Address *) address {\r\n     if(_address){\r\n         [_address release];\r\n     }\r\n     _address = [address retain];\r\n } \r\n\r\n\/\/assign \u65f6\uff1a\r\n -(void) setAddress: (Address *) address {\r\n     self.address = address;\r\n } \r\n\r\n\/\/copy \u65f6\uff1a\r\n -(void) setAddress: (Address *) address {\r\n     if(_address){\r\n         [_address release];\r\n     }\r\n     self.address = [address copyWithZone: zone];\/\/ Address \u5fc5\u987b\u5b9e\u73b0 NSCoping \u534f\u8bae\r\n }<\/pre>\n<\/div>\n<p><strong><br \/>\n\u53c2\u8003\u8d44\u6599<br \/>\n<\/strong>https:\/\/developer.apple.com\/library\/mac\/#documentation\/Cocoa\/Conceptual\/ObjCRuntimeGuide\/Articles\/ocrtPropertyIntrospection.html<br \/>\nhttp:\/\/www.cnblogs.com\/zilongshanren\/archive\/2011\/08\/03\/2125728.html<\/p>\n<blockquote data-secret=\"LTdkqsNWsY\" class=\"wp-embedded-content\"><p><a href=\"http:\/\/unmi.cc\/objective-c-proerty-synthsiz\/\">Objective-C \u7684\u5c5e\u6027\u4e0e\u5408\u6210\u65b9\u6cd5\u4f7f\u7528\u8be6\u89e3<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"http:\/\/unmi.cc\/objective-c-proerty-synthsiz\/embed\/#?secret=LTdkqsNWsY\" data-secret=\"LTdkqsNWsY\" width=\"500\" height=\"282\" title=\"&#8220;Objective-C \u7684\u5c5e\u6027\u4e0e\u5408\u6210\u65b9\u6cd5\u4f7f\u7528\u8be6\u89e3&#8221; &#8212; \u9694\u53f6\u9ec4\u83ba Unmi Blog\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Object-C\u5c5e\u6027\u5b9a\u4e49@property\u4fee\u9970\u7b26\u4e3b\u8981\u6709 atomic nonatomic readonly r [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[91],"tags":[93,92],"_links":{"self":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1553"}],"collection":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/comments?post=1553"}],"version-history":[{"count":4,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1553\/revisions"}],"predecessor-version":[{"id":1557,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1553\/revisions\/1557"}],"wp:attachment":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/media?parent=1553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/categories?post=1553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/tags?post=1553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}