ios – 完美的Swift3 Boing

@IBOutlet var barHeight: NSLayoutConsTraint!


    barHeight.constant = barShut?30:100
    self.view.layoutIfNeeded()
    t = !barShut?30:100

    UIView.animate(withDuration: 0.15,delay: 0,options: UIViewAnimationOptions.curveEaSEOut,animations: { () -> Void in
            self.barHeight.constant = t
            self.view.layoutIfNeeded()
        },completion: {_ in
            Screen.barShut = !Screen.barShut
        }
    )

解决方法@H_403_27@

您可以使用内置于UIView的 spring animation method：

func toggleBar() -> Void {
    self.view.layoutIfNeeded()
    let newHeight:CGFloat = !barShut ? 30:100
    barShut = !barShut

    barHeightConsTraint.constant = newHeight

    UIView.animate(withDuration: 1.5,usingSpringWithDamping: 0.2,initialSpringVeLocity: 3,options: [],animations: {
        self.view.layoutIfNeeded()
    },completion: nil)

}

你需要更长的动画持续时间而不是0.15秒,以使反弹看起来真实;我认为我看起来非常好的价值,但你可以玩它们来获得你所追求的确切效果.@H_673_10@

由于动画持续时间较长,我发现在上一个动画仍在运行时我可以点击触发打开/@L_673_11@的按钮.在完成块中设置barShut意味着条形图对所有水龙头都没有反应.我在动画之外移动了切换来解决这个问题.@H_673_10@