iOS UIButton 点击放大缩小动画

+(void)buttonAnimationClick:(UIButton*)button{

    button.transform = CGAffineTransformIdentity;

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

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

            

            button.transform = CGAffineTransformMakeScale(1.1, 1.1);

        }];

        [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];

}