iOS 延遲1.5s 執行方法

標籤：queue   priority   lob   1.5   rms   tor   def   led   default   

   1. [self performSelector:@selector(fangfa) withObject:nil afterDelay:0.5];  // performSelector
  2.  [NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(fangfa) userInfo:nil repeats:NO]; //NSTimer
   //GCD
//在主線程順延強制 一般用這個

 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
   [self delayDo:@"GCD"];
   });
//在子線程順延強制
   dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
   [self delayDo:@"Global-GCD"];
   });

iOS 延遲1.5s 執行方法