swift - 如何在 swift 中为 borderColor 变化设置动画

Question

出于某种原因，这对我不起作用:

let color = CABasicAnimation(keyPath: "borderColor")
color.fromValue = sender.layer.borderColor;
color.toValue = UIColor.redColor().CGColor;
color.duration = 2;
color.repeatCount = 1;
sender.layer.addAnimation(color, forKey: "color and width");

我没有让任何动画发生。

Answer 1

Swift 4 UIView 扩展:

extension UIView {
  func animateBorderColor(toColor: UIColor, duration: Double) {
    let animation = CABasicAnimation(keyPath: "borderColor")
    animation.fromValue = layer.borderColor
    animation.toValue = toColor.cgColor
    animation.duration = duration
    layer.add(animation, forKey: "borderColor")
    layer.borderColor = toColor.cgColor
  }
}

然后通过编写来使用它:

myView.animateBorderColor(toColor: .red, duration: 0.5)