iOS点击button放大后缩小效果

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-(void)buttonClick{  

    button.transform = CGAffineTransformIdentity;  

    [UIView animateKeyframesWithDuration:0.5 delay:0 options:0 animations: ^{  

        [UIView addKeyframeWithRelativeStartTime:0 relativeDuration:1 / 3.0 animations: ^{  

              

            button.transform = CGAffineTransformMakeScale(1.5, 1.5);  

        }];  

        [UIView addKeyframeWithRelativeStartTime:1/3.0 relativeDuration:1/3.0 animations: ^{  

              

            button.transform = CGAffineTransformMakeScale(0.8, 0.8);  

        }];  

        [UIView addKeyframeWithRelativeStartTime:2/3.0 relativeDuration:1/3.0 animations: ^{  

              

            button.transform = CGAffineTransformMakeScale(1.0, 1.0);  

        }];  

    } completion:nil];  

}