我试着在它被点击的时候做UIButton%的zoom 动画，但我试图完成的是，当按钮被点击时，我需要UIButton变小到里面，然后它就会回到原来的大小(就像泡沫).
我try 了以下方法:
button.transform = CGAffineTransformMakeScale(-1, 1)
UIView.animateWithDuration(0.5, animations: { () -> Void in
button.transform = CGAffineTransformMakeScale(1,1)
})
试试这个
UIView.animate(withDuration: 0.6,
animations: {
self.button.transform = CGAffineTransform(scaleX: 0.6, y: 0.6)
},
completion: { _ in
UIView.animate(withDuration: 0.6) {
self.button.transform = CGAffineTransform.identity
}
})