很赞的单击动画效果

 UIView*view=sender.view;
 [UIView animateWithDuration:0.1f animations:^{
 view.transform=CGAffineTransformMakeScale(0.8, 0.8);
 } completion:^(BOOL finished) {
 [UIView animateWithDuration:0.1f animations:^{
 view.transform=CGAffineTransformMakeScale(1, 1);
 } completion:^(BOOL finished) {