{"id":12,"date":"2015-09-29T10:26:11","date_gmt":"2015-09-29T02:26:11","guid":{"rendered":"http:\/\/www.kejidana.com\/?p=12"},"modified":"2015-09-29T10:26:11","modified_gmt":"2015-09-29T02:26:11","slug":"objective-c%e4%b8%adatomic%e4%b8%8enonatomic%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"http:\/\/www.kejidana.com\/?p=12","title":{"rendered":"Objective-C\u4e2datomic\u4e0enonatomic\u533a\u522b"},"content":{"rendered":"<blockquote><p><em>atomic\u548cnonatomic\u7528\u6765\u51b3\u5b9a\u7f16\u8bd1\u5668\u751f\u6210\u7684getter\u548csetter\u662f\u5426\u4e3a\u539f\u5b50\u64cd\u4f5c\u3002<\/em><strong><br \/>\n<\/strong><\/p><\/blockquote>\n<ul>\n<li><strong>atomic<\/strong><\/li>\n<\/ul>\n<p>\u8bbe\u7f6e\u6210\u5458\u53d8\u91cf\u7684@property\u5c5e\u6027\u65f6\uff0c\u9ed8\u8ba4\u4e3aatomic\uff0c\u63d0\u4f9b\u591a\u7ebf\u7a0b\u5b89\u5168\u3002<\/p>\n<blockquote><p>\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u539f\u5b50\u64cd\u4f5c\u662f\u5fc5\u8981\u7684\uff0c\u5426\u5219\u6709\u53ef\u80fd\u5f15\u8d77\u9519\u8bef\u7684\u7ed3\u679c\u3002\u52a0\u4e86atomic\uff0csetter\u51fd\u6570\u4f1a\u53d8\u6210\u4e0b\u9762\u8fd9\u6837\uff1a<br \/>\n{lock}<br \/>\nif (property != newValue) {<br \/>\n[property release];<br \/>\nproperty = [newValue retain];<br \/>\n}<br \/>\n{unlock}<\/p><\/blockquote>\n<ul>\n<li><strong>\u00a0nonatomic<\/strong><\/li>\n<\/ul>\n<p>\u7981\u6b62\u591a\u7ebf\u7a0b\uff0c\u53d8\u91cf\u4fdd\u62a4\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<blockquote><p>atomic\u662fObjc\u4f7f\u7528\u7684\u4e00\u79cd\u7ebf\u7a0b\u4fdd\u62a4\u6280\u672f\uff0c\u57fa\u672c\u4e0a\u6765\u8bb2\uff0c\u662f\u9632\u6b62\u5728\u5199\u672a\u5b8c\u6210\u7684\u65f6\u5019\u88ab\u53e6\u5916\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u53d6\uff0c\u9020\u6210\u6570\u636e\u9519\u8bef\u3002\u800c\u8fd9\u79cd\u673a\u5236\u662f\u8017\u8d39\u7cfb\u7edf\u8d44\u6e90\u7684\uff0c\u6240\u4ee5\u5728iPhone\u8fd9\u79cd\u5c0f\u578b\u8bbe\u5907\u4e0a\uff0c\u5982\u679c\u6ca1\u6709\u4f7f\u7528\u591a\u7ebf\u7a0b\u95f4\u7684\u901a\u8baf\u7f16\u7a0b\uff0c\u90a3\u4e48nonatomic\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u9009\u62e9\u3002<\/p>\n<p>\u6307\u51fa\u8bbf\u95ee\u5668\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c\uff0c\u800c\u9ed8\u8ba4\u5730\uff0c\u8bbf\u95ee\u5668\u662f\u539f\u5b50\u64cd\u4f5c\u3002\u8fd9\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u89e3\u6790\u7684\u8bbf\u95ee\u5668\u63d0\u4f9b\u4e00\u4e2a\u5bf9\u5c5e\u6027\u7684\u5b89\u5168\u8bbf\u95ee\uff0c\u4ece\u83b7\u53d6\u5668\u5f97\u5230\u7684\u8fd4\u56de\u503c\u6216\u8005\u901a\u8fc7\u8bbe\u7f6e\u5668\u8bbe\u7f6e\u7684\u503c\u53ef\u4ee5\u4e00\u6b21\u5b8c\u6210\uff0c\u5373\u4fbf\u662f\u522b\u7684\u7ebf\u7a0b\u4e5f\u6b63\u5728\u5bf9\u5176\u8fdb\u884c\u8bbf\u95ee\u3002\u5982\u679c\u4f60\u4e0d\u6307\u5b9a nonatomic \uff0c\u5728\u81ea\u5df1\u7ba1\u7406\u5185\u5b58\u7684\u73af\u5883\u4e2d\uff0c\u89e3\u6790\u7684\u8bbf\u95ee\u5668\u4fdd\u7559\u5e76\u81ea\u52a8\u91ca\u653e\u8fd4\u56de\u7684\u503c\uff0c\u5982\u679c\u6307\u5b9a\u4e86 nonatomic \uff0c\u90a3\u4e48\u8bbf\u95ee\u5668\u53ea\u662f\u7b80\u5355\u5730\u8fd4\u56de\u8fd9\u4e2a\u503c\u3002<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>atomic\u548cnonatomic\u7528\u6765\u51b3\u5b9a\u7f16\u8bd1\u5668\u751f\u6210\u7684getter\u548csetter\u662f\u5426\u4e3a\u539f\u5b50\u64cd\u4f5c\u3002 at [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,21],"tags":[],"class_list":["post-12","post","type-post","status-publish","format-standard","hentry","category-app","category-objective-c"],"_links":{"self":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/posts\/12","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12"}],"version-history":[{"count":0,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=\/wp\/v2\/posts\/12\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.kejidana.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}