遅延処理

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1.0 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
    // 処理内容
});

 - (void)doAfterDelay{
   // 処理内容
 }
 [self performSelector:@selector(doAfterDelay) withObject:nil afterDelay:1];