多个动画次序播放

- (IBAction)zzAnimation
{
    [super viewDidAppear:YES];
    [UIView setAnimationDelegate:self];
    [UIView animateWithDuration:1.0
                     animations:^{
                         //self.label1.alpha = 0.0;
                         self.label2.alpha = 1.0;
                         self.label1.center = CGPointMake(100.0, 43);
                     }
                     completion:^(BOOL finished){
                         [UIView animateWithDuration:1.0
                                          animations:^{
                                              self.label2.center = CGPointMake(300.0, 112.0);
                                          }
                          completion:^(BOOL finished)
                          {
                              [UIView animateWithDuration:1.0
                                               animations:^{
                                                   self.label3.center = CGPointMake(300.0, 152.0);
                                               }];
                          }
                          ];
                     }];
    [UIView commitAnimations];
}