IOS学习之——延迟执行

//*****************************************************************************           07  延迟执行

 //延时执行
 // [self performSelector:<#(SEL)#> withObject:<#(id)#> afterDelay:<#(NSTimeInterval)#>];

 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
 self.loadMoreBtn.hidden = NO;
 self.loadMoreView.hidden = YES;