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];
}