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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(<#delayInSeconds#> * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
<#code to be executed after a specified delay#>
});
<#delayInSeconds#> 延迟时间
<#code to be executed after a specified delay#> 延迟内容
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原文地址:http://www.cnblogs.com/yyj900165/p/4945806.html