为左右两个按钮设置20像素的动画

Question

我想让按钮向左移动20个像素，我希望在原点后0.25秒返回。这就是我到目前为止所得到的：

@IBOutlet weak var Like: UIButton!

UIView.animate(withDuration: 0.25,
                       animations: {
                        var likeframe = self.Like.frame
                        likeframe.origin.x -= 20
        },
                       completion: { _ in
                        UIView.animate(withDuration: 0.25) {
                            var likeframe = self.Like.frame
                            likeframe.origin.x += 20

        }
})

请帮助！

Answer 1

您需要更改框架本身

UIView.animate(withDuration: 0.25,animations: {
          self.Like.frame =  self.Like.frame.offsetBy(dx:-20,dy:0)

        }) { _ in

           UIView.animate(withDuration: 0.25 , animations: {
            self.Like.frame =  self.Like.frame.offsetBy(dx:20,dy:0)

           })
}

Answer 2

更改帧并使用延迟功能延迟动画

UIView.animate(withDuration: 0.25,
               animations: {
                Like.frame.origin.x -= 20

},
               completion: { _ in
                UIView.animate(withDuration: 0.25, delay: 0.25, options: [], animations: {
                    Like.frame.origin.x += 20
                }, completion: nil)
})