逐渐在iOS中添加矩形动画

Posted 2021-05-03

我在Xcode中有一个视图应用程序，并在ViewController.swift中执行以下操作。我的目标是让屏幕在5秒内逐渐填满棕色矩形。我错过了什么或者方法完全错了吗？

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    let expandAnimation: CABasicAnimation = CABasicAnimation(keyPath: "path")
    expandAnimation.fromValue = UIBezierPath(rect: CGRect(x: 0.0, y: 0.0, width: 0.0, height: 0.0))
    expandAnimation.toValue = UIBezierPath(rect: CGRect(x: 0.0, y: 0.0, width: self.view.bounds.size.width, height: self.view.bounds.size.height))
    expandAnimation.duration = 5.0
    expandAnimation.fillMode = kCAFillModeForwards
    expandAnimation.isRemovedOnCompletion = false
    let rectLayer: CAShapeLayer = CAShapeLayer()
    rectLayer.fillColor = UIColor.brown.cgColor
    rectLayer.path = UIBezierPath(rect: CGRect(x: 0.0, y: 0.0, width: 0.0, height: 0.0)).cgPath
    rectLayer.add(expandAnimation, forKey: nil)
    self.view.layer.addSublayer(rectLayer)
}

我不希望颜色逐渐出现。我想要一种玻璃填充效果。想象一下

除了奇特的波浪效果。

答案

在更好地理解你的问题之后，你想要模拟水玻璃的归档（没有波浪的动画），你可以通过以下方式实现：

    let myLayer: CALayer = .init()
    myLayer.backgroundColor = UIColor.red.cgColor
    self.view.layer.addSublayer(myLayer)

    func animateFilling(to view:UIView)
    {
        var mFrame = CGRect(x: 0, y: view.frame.size.height, width: view.frame.size.width, height: 0)
        myLayer.frame = mFrame
        let fillingAnim = CABasicAnimation(keyPath: "bounds")
        fillingAnim.fillMode = kCAFillModeForwards
        fillingAnim.fromValue = mFrame
        fillingAnim.duration = 2
        fillingAnim.isRemovedOnCompletion = false
        mFrame.size.height = 1000
        fillingAnim.toValue = mFrame
        myLayer.add(fillingAnim, forKey: nil)
    }

另一答案

如果你不想要顶级浪潮，我觉得很容易做到这一点

  override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    let vv = UIView(frame: CGRect(x: 0, y: self.view.bounds.size.height, width: self.view.bounds.size.width, height: 0))

    vv.backgroundColor = UIColor.brown

    self.view.addSubview(vv)

    UIView.animate(withDuration: 5.0) {


         vv.frame = CGRect(x: 0, y: self.view.bounds.size.height / 3.0, width: self.view.bounds.size.width, height: self.view.bounds.size.height * 2 / 3.0)

    }

}