{"id":100169,"date":"2026-09-04T03:48:49","date_gmt":"2026-09-03T19:48:49","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/100169.html"},"modified":"2026-09-04T03:48:49","modified_gmt":"2026-09-03T19:48:49","slug":"ios-gcd%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/100169.html","title":{"rendered":"iOS: GCD\u5165\u95e8"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>GCD<\/li>\n<li>\n<ul>\n<li>\u7406\u89e3\u4efb\u52a1, \u961f\u5217, \u7ebf\u7a0b<\/li>\n<li>\u4e3a\u4ec0\u4e48\u9700\u8981GCD<\/li>\n<li>\u961f\u5217<\/li>\n<li>\n<ul>\n<li>\u4e32\u884c\u961f\u5217<\/li>\n<li>\u5e76\u53d1\u961f\u5217<\/li>\n<\/ul>\n<\/li>\n<li>sync \u548c async<\/li>\n<li>\n<ul>\n<li>\u4ec0\u4e48\u662f async<\/li>\n<li>\u4ec0\u4e48\u662f sync<\/li>\n<li>**\u5e76\u53d1\u961f\u5217\u548c\u4e32\u884c\u961f\u5217\u4e0esync \u548c async \u7684\u5173\u7cfb**<\/li>\n<\/ul>\n<\/li>\n<li>\u4e3b\u961f\u5217, \u4e3b\u7ebf\u7a0b\u4e0e\u6b7b\u9501<\/li>\n<li>\n<ul>\n<li>\u4ec0\u4e48\u662f\u4e3b\u961f\u5217<\/li>\n<li>\u4e3b\u961f\u5217\u4e0e\u4e3b\u7ebf\u7a0b<\/li>\n<li>\u6b7b\u9501&#xff08;Deadlock&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u5168\u5c40\u961f\u5217<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>GCD<\/h2>\n<p>GCD \u5168\u79f0&#xff1a;Grand Central Dispatch,<\/p>\n<p>\u5b83\u662f Apple \u63d0\u4f9b\u7684\u4e00\u5957\u5e76\u53d1\u7f16\u7a0b API\u3002\u6700\u7b80\u5355\u5730\u8bf4&#xff1a;GCD \u8d1f\u8d23\u628a\u4efb\u52a1\u63d0\u4ea4\u7ed9\u961f\u5217&#xff0c;\u7136\u540e\u7531\u7cfb\u7edf\u8d1f\u8d23\u8c03\u5ea6\u8fd9\u4e9b\u4efb\u52a1\u6267\u884c\u3002<\/p>\n<h3>\u7406\u89e3\u4efb\u52a1, \u961f\u5217, \u7ebf\u7a0b<\/h3>\n<p>\u5148\u770b\u4e0b\u9762\u4e00\u6bb5\u4ee3\u7801:<\/p>\n<p><span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">dispatch_get_global_queue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;Hello GCD&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d, \u5b9e\u9645\u4e0a\u6709\u4e09\u4e2a\u4e1c\u897f:<\/p>\n<p>\u4efb\u52a1 -&gt; \u961f\u5217 -&gt; GCD\u8c03\u5ea6\u6267\u884c<\/p>\n<p>\u4ee3\u7801\u4e2d\u7684<\/p>\n<p><span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;Hello GCD&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u662f\u4efb\u52a1, \u800c<\/p>\n<p><span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u662f\u961f\u5217, \u6700\u540e<\/p>\n<p><span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5c31\u662f \u628a\u4efb\u52a1\u63d0\u4ea4\u7ed9\u961f\u5217<\/p>\n<p>\u6ce8\u610f: \u961f\u5217\u4e0d\u662f\u7ebf\u7a0b<\/p>\n<p>\u4efb\u52a1\u5c31\u662f \u6211\u8981\u5e72\u4ec0\u4e48<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p><span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u4e0b\u8f7d\u56fe\u7247&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4efb\u52a1<\/p>\n<p><span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;%d&#034;<\/span><span class=\"token punctuation\">,<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4e5f\u662f\u4e00\u4e2a\u4efb\u52a1<\/p>\n<p>\u961f\u5217\u53ef\u4ee5\u7406\u89e3\u4e3a\u4efb\u52a1\u7684\u7ba1\u7406\u8005, \u4f8b\u5982:<\/p>\n<p>\u961f\u5217<br \/>\n\u2502<br \/>\n\u251c\u2500\u2500 \u4efb\u52a1 A<br \/>\n\u251c\u2500\u2500 \u4efb\u52a1 B<br \/>\n\u251c\u2500\u2500 \u4efb\u52a1 C<br \/>\n\u2514\u2500\u2500 \u4efb\u52a1 D<\/p>\n<p>GCD \u4f1a\u6839\u636e\u961f\u5217\u7684\u89c4\u5219\u51b3\u5b9a\u8fd9\u4e9b\u4efb\u52a1\u5e94\u8be5\u6309\u7167\u4ec0\u4e48\u65b9\u5f0f\u88ab\u8c03\u5ea6<\/p>\n<p>\u7ebf\u7a0b\u624d\u662f\u771f\u6b63\u6267\u884c\u4ee3\u7801\u7684\u6267\u884c\u5b9e\u4f53<\/p>\n<h3>\u4e3a\u4ec0\u4e48\u9700\u8981GCD<\/h3>\n<p>\u5047\u5982\u9700\u8981\u52a0\u8f7d\u4e00\u5f20\u5f88\u5927\u7684\u7167\u7247<\/p>\n<p>UIImage <span class=\"token operator\">*<\/span>image <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">self<\/span> loadBigImage<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e2a\u64cd\u4f5c\u975e\u5e38\u8017\u65f6<\/p>\n<p>\u5982\u679c\u5b83\u53d1\u751f\u5728\u4e3b\u7ebf\u7a0b, \u5c31\u4f1a\u53d1\u751f: \u4e3b\u7ebf\u7a0b -&gt; \u52a0\u8f7d\u56fe\u7247 -&gt; \u7b49\u5f85 -&gt; \u7b49\u5f85 -&gt; \u7b49\u5f85 -&gt; UI\u5361\u4f4f<\/p>\n<p>\u7528\u6237\u5c31\u4f1a\u770b\u5230APP\u5361\u987f, \u754c\u9762\u65e0\u6cd5\u54cd\u5e94, \u6211\u4eec\u5e0c\u671b: \u4e3b\u7ebf\u7a0b\u8d1f\u8d23UI, \u540e\u53f0\u7ebf\u7a0b\u8d1f\u8d23\u8017\u65f6\u4efb\u52a1<\/p>\n<p>GCD\u5c31\u53ef\u4ee5\u5e2e\u6211\u4eec\u5b8c\u6210\u4efb\u52a1\u8c03\u5ea6, \u4f8b\u5982:<\/p>\n<p><span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">dispatch_get_global_queue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p>    UIImage <span class=\"token operator\">*<\/span>image <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">self<\/span> loadBigImage<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">dispatch_get_main_queue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token keyword\">self<\/span><span class=\"token punctuation\">.<\/span>imageView<span class=\"token punctuation\">.<\/span>image <span class=\"token operator\">&#061;<\/span> image<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u5c31\u51fa\u73b0\u4e86\u975e\u5e38\u7ecf\u5178\u7684 iOS \u5f00\u53d1\u6a21\u5f0f:<\/p>\n<p>\u540e\u53f0\u6267\u884c\u8017\u65f6\u64cd\u4f5c -&gt; \u5f97\u5230\u7ed3\u679c -&gt; \u56de\u5230\u4e3b\u7ebf\u7a0b\u66f4\u65b0 UI<\/p>\n<h3>\u961f\u5217<\/h3>\n<p>\u961f\u5217\u6709\u4e24\u4e2a\u6838\u5fc3\u5c5e\u6027:<\/p>\n<ul>\n<li>\u4e32\u884c Serial: \u4e00\u6b21\u6267\u884c\u4e00\u4e2a\u4efb\u52a1<\/li>\n<li>\u5e76\u53d1 Concurrent: \u5141\u8bb8\u591a\u4e2a\u4efb\u52a1\u4eba\u540c\u65f6\u6267\u884c<\/li>\n<\/ul>\n<h4>\u4e32\u884c\u961f\u5217<\/h4>\n<p>    dispatch_queue_t queue <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">dispatch_queue_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;com.demo.serial&#034;<\/span><span class=\"token punctuation\">,<\/span> DISPATCH_QUEUE_SERIAL<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u4efb\u52a1 A&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u4efb\u52a1 B&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u4efb\u52a1 C&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4e2a\u961f\u5217\u662f\u4e32\u884c(Serial) \u961f\u5217, \u6240\u4ee5\u4e00\u5b9a\u6ee1\u8db3: \u540c\u4e00\u65f6\u523b\u6700\u591a\u6267\u884c\u4e00\u4e2a\u4efb\u52a1<\/p>\n<h4>\u5e76\u53d1\u961f\u5217<\/h4>\n<p>    dispatch_queue_t queue <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">dispatch_queue_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;com.demo.current&#034;<\/span><span class=\"token punctuation\">,<\/span> DISPATCH_QUEUE_CONCURRENT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u4efb\u52a1 A&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u4efb\u52a1 B&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u4efb\u52a1 C&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5e76\u53d1\u961f\u5217\u4e2d\u591a\u4e2a\u4efb\u52a1\u53ef\u4ee5\u540c\u65f6\u6267\u884c<\/p>\n<p>\u8fd9\u91cc\u6709\u4e00\u4e2a\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\u5c31\u662f: \u8fd9\u91cc\u5e76\u53d1\u961f\u5217\u4e0d\u4e00\u5b9a\u521b\u5efa\u4e86\u4e09\u4e2a\u7ebf\u7a0b<\/p>\n<p>\u961f\u5217\u53ea\u8d1f\u8d23\u63cf\u8ff0\u4efb\u52a1\u5e94\u8be5\u5982\u4f55\u88ab\u8c03\u5ea6, \u771f\u6b63\u4f7f\u7528\u591a\u5c11\u7ebf\u7a0b, \u7531\u7cfb\u7edf\u7684\u7ebf\u7a0b\u6c60\u548c\u8c03\u5ea6\u673a\u5236\u51b3\u5b9a<\/p>\n<h3>sync \u548c async<\/h3>\n<p>dispatch_sync \u548c dispatch_async \u4e5f\u5c31\u662f \u540c\u6b65\u63d0\u4ea4\u548c\u5f02\u6b65\u63d0\u4ea4, \u8fd9\u91cc\u7684 sync \u548c async \u9996\u5148\u63cf\u8ff0\u7684\u662f \u63d0\u4ea4\u4efb\u52a1\u7684\u90a3\u4e2a\u7ebf\u7a0b, \u8981\u4e0d\u8981\u7b49\u5f85\u4efb\u52a1\u6267\u884c\u7ed3\u675f, \u800c\u4e0d\u662f sync &#061; \u4e3b\u7ebf\u7a0b, async &#061; \u5b50\u7ebf\u7a0b<\/p>\n<h4>\u4ec0\u4e48\u662f async<\/h4>\n<p>\u770b\u4e0b\u9762\u4ee3\u7801:<\/p>\n<p>    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;task&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p>\u8fd9\u91cc\u53ef\u4ee5\u7406\u89e3\u4e3a: \u628a\u4efb\u52a1\u63d0\u4ea4\u7ed9queue, \u7136\u540e\u5f53\u524d\u7ebf\u7a0b\u4e0d\u7528\u7b49\u5f85\u8fd9\u4e2a\u4efb\u52a1\u6267\u884c\u5b8c\u6210, \u7ee7\u7eed\u5411\u4e0b\u6267\u884c.<\/p>\n<p>    dispatch_queue_t queue <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">dispatch_queue_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;com.demo.current&#034;<\/span><span class=\"token punctuation\">,<\/span> DISPATCH_QUEUE_CONCURRENT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">dispatch_async<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;3&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u7684\u6267\u884c\u7ed3\u679c\u662f<\/p>\n<p>1<br \/>\n3<br \/>\n2<\/p>\n<p>\u8fd9\u662f\u56e0\u4e3a:<\/p>\n<p>NSLog(&#064;&#034;1&#034;);<br \/>\n   \u2193<br \/>\n\u63d0\u4ea4\u4efb\u52a1 2<br \/>\n   \u2193<br \/>\n\u4e0d\u7b49\u5f85<br \/>\n   \u2193<br \/>\nNSLog(&#064;&#034;3&#034;)<\/p>\n<p>\u4e0e\u6b64\u540c\u65f6&#xff1a;<\/p>\n<p>\u4efb\u52a1 2<br \/>\n \u2193<br \/>\n\u7b49\u5f85 queue \u8c03\u5ea6<br \/>\n \u2193<br \/>\n\u6267\u884c<\/p>\n<h4>\u4ec0\u4e48\u662f sync<\/h4>\n<p><span class=\"token function\">dispatch_sync<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u610f\u601d\u662f: \u628a\u4efb\u52a1\u63d0\u4ea4\u7ed9 queue, \u7136\u540e\u5f53\u524d\u7ebf\u7a0b\u5fc5\u987b\u7b49\u5f85\u8fd9\u4e2a\u4efb\u52a1\u6267\u884c\u7ed3\u675f, \u624d\u80fd\u7ee7\u7eed\u5f80\u4e0b\u8d70.<\/p>\n<p>\u6240\u4ee5&#xff1a;<\/p>\n<p><span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">dispatch_sync<\/span><span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;2&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;3&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6267\u884c\u987a\u5e8f\u4e00\u5b9a\u662f&#xff1a;<\/p>\n<p>1<br \/>\n\u2193<br \/>\n2<br \/>\n\u2193<br \/>\n3<\/p>\n<p>\u56e0\u4e3a sync \u4f1a\u7b49\u5f85\u3002<\/p>\n<p>\u8fd9\u662f GCD \u5b66\u4e60\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u7b2c\u4e00\u6761\u516c\u5f0f&#xff1a;<\/p>\n<p>sync<br \/>\n&#061;<br \/>\n\u63d0\u4ea4\u4efb\u52a1<br \/>\n&#043;<br \/>\n\u7b49\u5f85\u4efb\u52a1\u6267\u884c\u5b8c\u6210<br \/>\n&#043;<br \/>\n\u5f53\u524d\u7ebf\u7a0b\u7ee7\u7eed<\/p>\n<p>\u800c&#xff1a;<\/p>\n<p>async<br \/>\n&#061;<br \/>\n\u63d0\u4ea4\u4efb\u52a1<br \/>\n&#043;<br \/>\n\u4e0d\u7b49\u5f85<br \/>\n&#043;<br \/>\n\u5f53\u524d\u7ebf\u7a0b\u7ee7\u7eed<\/p>\n<h4>\u5e76\u53d1\u961f\u5217\u548c\u4e32\u884c\u961f\u5217\u4e0esync \u548c async \u7684\u5173\u7cfb<\/h4>\n<p>sync\/async \u51b3\u5b9a\u201c\u662f\u5426\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\u201d\u548c\u201c\u662f\u5426\u53ef\u80fd\u5f00\u65b0\u7ebf\u7a0b\u201d \u4e32\u884c\/\u5e76\u53d1\u961f\u5217 \u51b3\u5b9a\u201c\u4efb\u52a1\u5982\u4f55\u88ab\u53d6\u51fa\u6267\u884c\u201d&#xff08;\u4e00\u4e2a\u63a5\u4e00\u4e2a vs \u540c\u65f6\u591a\u4e2a&#xff09;<\/p>\n<p>\u540c\u6b65\u5f02\u6b65\u51fd\u6570 \u540c\u6b65\u51fd\u6570&#xff08;sync&#xff09;\u548c\u5f02\u6b65\u51fd\u6570&#xff08;async&#xff09;&#xff0c;\u53ea\u80fd\u51b3\u5b9a\u80fd\u5426\u5f00\u542f\u65b0\u7684\u7ebf\u7a0b\u6267\u884c\u4efb\u52a1&#xff0c;\u4e0d\u80fd\u51b3\u5b9a\u51fd\u6570\u662f\u4e32\u884c\u6267\u884c\u8fd8\u662f\u5e76\u884c\u6267\u884c<\/p>\n<p>\u540c\u6b65:<\/p>\n<ul>\n<li>\u5728\u5f53\u524d\u7ebf\u7a0b\u4e2d\u6267\u884c,\u4e0d\u5177\u5907\u5f00\u542f\u65b0\u7ebf\u7a0b\u7684\u80fd\u529b<\/li>\n<li>\u961f\u5217\u540e\u9762\u7684\u5185\u5bb9\u9700\u8981\u7b49\u5230\u540c\u6b65\u51fd\u6570\u8fd4\u56de\u540e\u624d\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c<\/li>\n<\/ul>\n<p>\u5f02\u6b65:<\/p>\n<ul>\n<li>\u62e5\u6709\u5f00\u521b\u65b0\u7ebf\u7a0b\u7684\u80fd\u529b, \u4f46\u662f\u4e0d\u4e00\u5b9a\u4f1a\u5f00\u542f\u65b0\u7ebf\u7a0b<\/li>\n<li>\u540e\u9762\u7684\u5185\u5bb9\u4e0d\u9700\u8981\u7b49\u5f02\u6b65\u51fd\u6570\u8fd4\u56de\u540e\u6267\u884c,\u540e\u9762\u7684\u5185\u5bb9\u53ef\u4ee5\u76f4\u63a5\u6267\u884c,\u6240\u4ee5\u9700\u8981\u5f00\u542f\u65b0\u7ebf\u7a0b,\u56e0\u6b64\u5177\u5907\u5f00\u542f\u65b0\u7ebf\u7a0b\u7684\u80fd\u529b<\/li>\n<\/ul>\n<p>\u540c\u6b65\u51fd\u6570: \u540c\u6b65\u51fd\u6570\u4f1a\u963b\u585e\u5f53\u524d\u51fd\u6570\u7684\u8fd4\u56de, \u5f02\u6b65\u51fd\u6570\u4f1a\u7acb\u5373\u6267\u884c,\u6267\u884c\u4e0b\u9762\u7684\u4ee3\u7801<\/p>\n<p>\u540c\u6b65\u51fd\u6570\u540e\u9762\u7684\u5185\u5bb9\u8981\u7b49\u5230\u540c\u6b65\u51fd\u6570\u8fd4\u56de\u624d\u53ef\u4ee5\u6267\u884c,\u5f02\u6b65\u51fd\u6570\u540e\u9762\u7684\u5185\u5bb9\u4e0d\u9700\u8981\u7b49\u5f02\u6b65\u51fd\u6570\u8fd4\u56de\u624d\u6267\u884c,\u53ef\u4ee5\u76f4\u63a5\u6267\u884c,\u5f02\u6b65\u51fd\u6570\u91cc\u9762\u7684\u5185\u53ef\u80fd\u9700\u8981\u5f00\u542f\u4e00\u4e2a\u65b0\u7ebf\u7a0b\u6765\u6267\u884c<\/p>\n<p>\u4e32\u884c\u5e76\u884c\u961f\u5217 \u4e3b\u8981\u5f71\u54cd\u4efb\u52a1\u7684\u6267\u884c\u65b9\u5f0f.\u80fd\u4e0d\u80fd\u5f00\u542f\u65b0\u7ebf\u7a0b\u53d6\u51b3\u4e8e\u4e0a\u9762\u7684\u51fd\u6570<\/p>\n<p>\u5e76\u53d1:\u591a\u4e2a\u4efb\u52a1\u5e76\u53d1\u6267\u884c<\/p>\n<p>\u4e32\u884c:\u4e00\u4e2a\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\u624d\u53bb\u6267\u884c\u4e0b\u4e00\u4e2a\u4efb\u52a1<\/p>\n<table>\n<tr>\u51fd\u6570\u961f\u5217\u7c7b\u578b\u662f\u5426\u5f00\u65b0\u7ebf\u7a0b\u6267\u884c\u65b9\u5f0f\u662f\u5426\u963b\u585e\u5f53\u524d\u7ebf\u7a0b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">async<\/td>\n<td align=\"left\">\u5e76\u53d1\u961f\u5217<\/td>\n<td align=\"left\">\u2705 \u591a\u4e2a<\/td>\n<td align=\"left\">\u5e76\u53d1<\/td>\n<td align=\"left\">\u274c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">async<\/td>\n<td align=\"left\">\u4e32\u884c\u961f\u5217<\/td>\n<td align=\"left\">\u2705 1\u4e2a<\/td>\n<td align=\"left\">\u4e32\u884c<\/td>\n<td align=\"left\">\u274c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">async<\/td>\n<td align=\"left\">\u4e3b\u961f\u5217<\/td>\n<td align=\"left\">\u274c<\/td>\n<td align=\"left\">\u4e32\u884c<\/td>\n<td align=\"left\">\u274c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">sync<\/td>\n<td align=\"left\">\u5e76\u53d1\u961f\u5217<\/td>\n<td align=\"left\">\u274c<\/td>\n<td align=\"left\">\u4e32\u884c<\/td>\n<td align=\"left\">\u2705<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">sync<\/td>\n<td align=\"left\">\u4e32\u884c\u961f\u5217<\/td>\n<td align=\"left\">\u274c<\/td>\n<td align=\"left\">\u4e32\u884c<\/td>\n<td align=\"left\">\u2705<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">sync<\/td>\n<td align=\"left\">\u4e3b\u961f\u5217<\/td>\n<td align=\"left\">\u274c<\/td>\n<td align=\"left\">&#x1f480; \u6b7b\u9501<\/td>\n<td align=\"left\">\u2705<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u201casync\/sync \u7684\u4f18\u5148\u7ea7\u5728\u961f\u5217\u4e4b\u4e0a\u201d<\/p>\n<p>\u51c6\u786e\u5730\u8bf4\u5e94\u8be5\u662f&#xff1a;<\/p>\n<p>sync\/async \u51b3\u5b9a&#034;\u6267\u884c\u673a\u5236&#034;&#xff08;\u662f\u5426\u963b\u585e\u3001\u662f\u5426\u5f00\u7ebf\u7a0b&#xff09; \u961f\u5217\u7c7b\u578b\u51b3\u5b9a&#034;\u8c03\u5ea6\u7b56\u7565&#034;&#xff08;\u4e32\u884c\u8fd8\u662f\u5e76\u53d1&#xff09; \u4f46 sync\/async \u7684\u7ea6\u675f\u4f1a\u8986\u76d6\u961f\u5217\u7684\u7279\u6027<\/p>\n<h3>\u4e3b\u961f\u5217, \u4e3b\u7ebf\u7a0b\u4e0e\u6b7b\u9501<\/h3>\n<h4>\u4ec0\u4e48\u662f\u4e3b\u961f\u5217<\/h4>\n<p>dispatch_get_queue(), \u5b83\u8fd4\u56de\u7684\u5c31\u662f:<\/p>\n<p>\u4e3b\u961f\u5217: dispatch_get_main_queue() <\/p>\n<p>\u4e3b\u961f\u5217\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u4e32\u884c\u961f\u5217<\/p>\n<h4>\u4e3b\u961f\u5217\u4e0e\u4e3b\u7ebf\u7a0b<\/h4>\n<p>\u4e3b\u961f\u5217\u4e0e\u4e3b\u7ebf\u7a0b\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u4e1c\u897f<\/p>\n<p>\u4e3b\u961f\u5217<br \/>\n    \u2193<br \/>\n\u8d1f\u8d23\u7ba1\u7406\u63d0\u4ea4\u7ed9\u5b83\u7684\u4efb\u52a1<\/p>\n<p>\u4e3b\u7ebf\u7a0b<br \/>\n    \u2193<br \/>\n\u771f\u6b63\u6267\u884c\u4ee3\u7801<\/p>\n<p>\u4f46\u662f\u4e3b\u961f\u5217\u548c\u4e3b\u7ebf\u7a0b\u4e4b\u95f4\u5b58\u5728\u975e\u5e38\u7d27\u5bc6\u7684\u5173\u7cfb:<\/p>\n<p>Main Queue<br \/>\n     \u2193<br \/>\n\u4efb\u52a1<br \/>\n     \u2193<br \/>\nMain Thread<br \/>\n     \u2193<br \/>\n\u6267\u884c<\/p>\n<p>\u6240\u4ee5\u5728\u6b63\u5e38\u60c5\u51b5\u4e0b, \u63d0\u4ea4\u5230\u4e3b\u7ebf\u7a0b\u7684\u4efb\u52a1, \u4f1a\u5728\u4e3b\u7ebf\u7a0b\u6267\u884c<\/p>\n<h4>\u6b7b\u9501&#xff08;Deadlock&#xff09;<\/h4>\n<p>\u4ec0\u4e48\u662f\u6b7b\u9501<\/p>\n<p>\u6b7b\u9501\u53d1\u751f\u5728\u201c\u540c\u6b65&#xff08;Sync&#xff09;\u201d &#043; \u201c\u5f53\u524d\u4e32\u884c\u961f\u5217\u201d\u3002 \u7ecf\u5178\u7684\u9519\u8bef\u4ee3\u7801\u5982\u4e0b&#xff0c;\u8fd0\u884c\u5fc5\u5d29\u6e83&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u8fd9\u6bb5\u4ee3\u7801\u8dd1\u5728\u4e3b\u7ebf\u7a0b&#xff08;\u4e3b\u961f\u5217\u662f\u4e32\u884c\u7684&#xff09;<\/span><br \/>\n<span class=\"token function\">dispatch_sync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">dispatch_get_main_queue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">^<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">NSLog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#064;&#034;\u6211\u6267\u884c\u4e86\u5417&#xff1f;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6c38\u8fdc\u4e0d\u4f1a\u6253\u5370&#xff01;APP\u5361\u6b7b&#xff01;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e3b\u961f\u5217\u662f\u4e32\u884c\u7684&#xff0c;\u91cc\u9762\u6b63\u653e\u7740\u5f53\u524d\u8fd9\u4e2a viewDidLoad \u4efb\u52a1\u3002\u73b0\u5728\u5f80\u4e3b\u961f\u5217\u91cc\u540c\u6b65\u8ffd\u52a0\u4e00\u4e2aBlock&#xff0c;\u540c\u6b65\u610f\u5473\u7740\u201c\u6211\u5fc5\u987b\u7b49\u4f60\u6267\u884c\u5b8c&#xff0c;\u6211\u624d\u80fd\u5f80\u4e0b\u8d70\u201d\u3002\u4f46\u4e3b\u961f\u5217\u5728\u7b49 viewDidLoad \u6267\u884c\u5b8c\u624d\u80fd\u5904\u7406Block&#xff0c;\u800c viewDidLoad \u5728\u7b49Block\u6267\u884c\u5b8c\u624d\u7ed3\u675f\u3002\u4e92\u76f8\u7b49\u5f85 -&gt; \u6b7b\u9501\u3002<\/p>\n<h3>\u5168\u5c40\u961f\u5217<\/h3>\n<p><span class=\"token function\">dispatch_get_global_queue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <\/p>\n<p>\u4ec0\u4e48\u662f\u5168\u5c40\u961f\u5217<\/p>\n<p>dispatch_queue_t queue <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">dispatch_get_global_queue<\/span><span class=\"token punctuation\">(<\/span>DISPATCH_QUEUE_PRIORITY_DEFAULT<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b83\u662fApple\u63d0\u4f9b\u7684\u7cfb\u7edf\u961f\u5217<\/p>\n<p>\u7279\u70b9: \u5e76\u53d1\u961f\u5217<\/p>\n<p>\u5b83\u7c7b\u4f3c: Concurrent Queue, \u53ef\u4ee5\u540c\u65f6\u6267\u884c\u591a\u4e2a\u4efb\u52a1<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55GCD\u7406\u89e3\u4efb\u52a1, \u961f\u5217, \u7ebf\u7a0b\u4e3a\u4ec0\u4e48\u9700\u8981GCD\u961f\u5217\u4e32\u884c\u961f\u5217\u5e76\u53d1\u961f\u5217sync \u548c async\u4ec0\u4e48\u662f async\u4ec0\u4e48\u662f sync**\u5e76\u53d1\u961f\u5217\u548c\u4e32\u884c\u961f\u5217\u4e0esync \u548c async \u7684\u5173\u7cfb**\u4e3b\u961f\u5217, \u4e3b\u7ebf\u7a0b\u4e0e\u6b7b\u9501\u4ec0\u4e48\u662f\u4e3b\u961f\u5217\u4e3b\u961f\u5217\u4e0e\u4e3b\u7ebf\u7a0b\u6b7b\u9501&#xff08;Deadlock&#xff09;\u5168\u5c40\u961f\u5217GCD<br \/>\nGCD \u5168\u79f0&#xff1a;Grand Central Dispatch,<br \/>\n\u5b83\u662f Apple \u63d0\u4f9b\u7684\u4e00\u5957\u5e76\u53d1\u7f16\u7a0b API\u3002\u6700\u7b80\u5355\u5730\u8bf4&#xff1a;GCD \u8d1f\u8d23\u628a\u4efb\u52a1\u63d0<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[10952,4027,1680,5388,586],"topic":[],"class_list":["post-100169","post","type-post","status-publish","format-standard","hentry","category-server","tag-10952","tag-cocoa","tag-ios","tag-xcode","tag-586"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>iOS: GCD\u5165\u95e8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/100169.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"iOS: GCD\u5165\u95e8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u76ee\u5f55GCD\u7406\u89e3\u4efb\u52a1, \u961f\u5217, \u7ebf\u7a0b\u4e3a\u4ec0\u4e48\u9700\u8981GCD\u961f\u5217\u4e32\u884c\u961f\u5217\u5e76\u53d1\u961f\u5217sync \u548c async\u4ec0\u4e48\u662f async\u4ec0\u4e48\u662f sync**\u5e76\u53d1\u961f\u5217\u548c\u4e32\u884c\u961f\u5217\u4e0esync \u548c async \u7684\u5173\u7cfb**\u4e3b\u961f\u5217, \u4e3b\u7ebf\u7a0b\u4e0e\u6b7b\u9501\u4ec0\u4e48\u662f\u4e3b\u961f\u5217\u4e3b\u961f\u5217\u4e0e\u4e3b\u7ebf\u7a0b\u6b7b\u9501&#xff08;Deadlock&#xff09;\u5168\u5c40\u961f\u5217GCD GCD \u5168\u79f0&#xff1a;Grand Central Dispatch, \u5b83\u662f Apple \u63d0\u4f9b\u7684\u4e00\u5957\u5e76\u53d1\u7f16\u7a0b API\u3002\u6700\u7b80\u5355\u5730\u8bf4&#xff1a;GCD \u8d1f\u8d23\u628a\u4efb\u52a1\u63d0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/100169.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-03T19:48:49+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/100169.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/100169.html\",\"name\":\"iOS: GCD\u5165\u95e8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-09-03T19:48:49+00:00\",\"dateModified\":\"2026-09-03T19:48:49+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/100169.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/100169.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/100169.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"iOS: GCD\u5165\u95e8\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"iOS: GCD\u5165\u95e8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/100169.html","og_locale":"zh_CN","og_type":"article","og_title":"iOS: GCD\u5165\u95e8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u6587\u7ae0\u76ee\u5f55GCD\u7406\u89e3\u4efb\u52a1, \u961f\u5217, \u7ebf\u7a0b\u4e3a\u4ec0\u4e48\u9700\u8981GCD\u961f\u5217\u4e32\u884c\u961f\u5217\u5e76\u53d1\u961f\u5217sync \u548c async\u4ec0\u4e48\u662f async\u4ec0\u4e48\u662f sync**\u5e76\u53d1\u961f\u5217\u548c\u4e32\u884c\u961f\u5217\u4e0esync \u548c async \u7684\u5173\u7cfb**\u4e3b\u961f\u5217, \u4e3b\u7ebf\u7a0b\u4e0e\u6b7b\u9501\u4ec0\u4e48\u662f\u4e3b\u961f\u5217\u4e3b\u961f\u5217\u4e0e\u4e3b\u7ebf\u7a0b\u6b7b\u9501&#xff08;Deadlock&#xff09;\u5168\u5c40\u961f\u5217GCD GCD \u5168\u79f0&#xff1a;Grand Central Dispatch, \u5b83\u662f Apple \u63d0\u4f9b\u7684\u4e00\u5957\u5e76\u53d1\u7f16\u7a0b API\u3002\u6700\u7b80\u5355\u5730\u8bf4&#xff1a;GCD \u8d1f\u8d23\u628a\u4efb\u52a1\u63d0","og_url":"https:\/\/www.wsisp.com\/helps\/100169.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-09-03T19:48:49+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"2 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/100169.html","url":"https:\/\/www.wsisp.com\/helps\/100169.html","name":"iOS: GCD\u5165\u95e8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-09-03T19:48:49+00:00","dateModified":"2026-09-03T19:48:49+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/100169.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/100169.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/100169.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"iOS: GCD\u5165\u95e8"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/100169","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=100169"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/100169\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=100169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=100169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=100169"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=100169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}