iOS延迟加载

dispatch_time_t popTimer =
dispatch_time(DISPATCH_TIME_NOW, (int64_t) (delayInSeconds *
NSEC_PER_SEC));

 
     
dispatch_after(popTimer, dispatch_get_main_queue(), ^{

 
     
    [UIView
animateWithDuration:0.2 animations:^{

 
     
     
  vc.view.alpha = 0.0;

 
     
    } completion:^(BOOL finished)
{

 
     
     
  [vc.view removeFromSuperview];

 
     
    }];

 
     
});