ios - 如何使整个 UIView 淡入白色并返回？

Question

这个问题已经解决了。

我试图让屏幕在按下按钮时淡出并变回白色。我发现了一些将视图的 alpha 淡化为 0 并返回 1 的代码，这会将整个屏幕的颜色更改为黑色。我想要的是一种让它褪色为白色而不是黑色的方法。我是编码初学者，非常感谢任何帮助。谢谢！

这是淡化 UIView 的扩展代码：

extension UIView {
func fadeIn(_ duration: TimeInterval = 1.0, delay: TimeInterval = 0.0, completion: @escaping ((Bool) -> Void) = {(finished: Bool) -> Void in}) {
    UIView.animate(withDuration: duration, delay: delay, options: UIView.AnimationOptions.curveEaseIn, animations: {
        self.alpha = 1.0
    }, completion: completion)  }

func fadeOut(_ duration: TimeInterval = 1.0, delay: TimeInterval = 0.0, completion: @escaping (Bool) -> Void = {(finished: Bool) -> Void in}) {
    UIView.animate(withDuration: duration, delay: delay, options: UIView.AnimationOptions.curveEaseIn, animations: {
        self.alpha = 0.0
    }, completion: completion)
}

这是我实现扩展的代码：

@IBAction func playButtonPressed(_ sender: Any) {
    self.view.fadeOut(completion: {
        (finished: Bool) -> Void in
        self.view.fadeIn()
    })
}

标签： iosswiftuiviewfadeinfadeout

Answer 1

let whiteView = UIView(frame: view.frame)
whiteView.backgroundColor = .white
whiteView.alpha = 0
view.addSubview(whiteView)

UIViewPropertyAnimator.runningPropertyAnimator(withDuration: 1.0, delay: 0, options: .curveEaseIn, animations: {
  whiteView.alpha = 1.0
}, completion: nil)