CAShapeLayer 动画不会触发 animationDidStop

Question

运行 tvOS 使用 Swift 3.0

基本应用程序，这是视图控制器中的代码...我想在 CAShapeLayer 淡出后删除它。动画完美运行，但完成方法 animationDidStop 从未被调用？

想使用override func animationDidStop方法，但是编译不通过。给我错误 "method does not override any method from its superclass" 这肯定是错误的，animationDidStop 是 CAAnimation class.

的成员

这段代码有什么问题？我可以用计时器或我猜的东西来解决这个问题，但这是一个软糖。

import UIKit
import QuartzCore


class ViewController: UIViewController, CALayerDelegate, CAAnimationDelegate {

var shapeLayer = CAShapeLayer()


override func viewDidLoad() {
    super.viewDidLoad()
    highlight(XCord: 100, YCord: 100)
    clearhighlight()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func highlight(XCord: CGFloat, YCord: CGFloat) {
    DispatchQueue.main.async {
        let circlePath = UIBezierPath(arcCenter: CGPoint(x: XCord,y: YCord), radius: CGFloat(20), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true)

        self.shapeLayer.path = circlePath.cgPath

        //change the fill color
        //shapeLayer.fillColor = UIColor.clear.cgColor
        self.shapeLayer.fillColor = UIColor.red.cgColor
        self.shapeLayer.opacity = 0.5
        self.shapeLayer.fillRule = kCAFillRuleEvenOdd

        //you can change the stroke color
        self.shapeLayer.strokeColor =  UIColor.red.cgColor
        //you can change the line width
        self.shapeLayer.lineWidth = 3.0

        DispatchQueue.main.async {
            self.view.layer.addSublayer(self.shapeLayer)
        }
    }
}

func clearhighlight() {
    DispatchQueue.main.async {
        let fadeInAndOut = CABasicAnimation(keyPath: "opacity")
        fadeInAndOut.duration = 10.0;
        //fadeInAndOut.autoreverses = true;
        fadeInAndOut.repeatCount = 1
        fadeInAndOut.fromValue = 1.0
        fadeInAndOut.toValue = 0.0
        fadeInAndOut.isRemovedOnCompletion = true
        fadeInAndOut.fillMode = kCAFillModeForwards;
        //self.view.layer.delegate = self
        self.shapeLayer.delegate = self
        self.shapeLayer.add(fadeInAndOut, forKey: "fadeOut")
        self.shapeLayer.setNeedsDisplay()
    }
}

func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
    print("animationDidStop")
    DispatchQueue.main.async {
        self.shapeLayer.removeFromSuperlayer()
    }
}



}

Answer 1

您正在设置形状层的委托：

self.shapeLayer.delegate = self

但是如果你想调用animationDidStop，你必须设置动画的delegate，而不是层的:

fadeInAndOut.delegate = self

你说：

Want to use override func animationDidStop method, but it won't compile. Gives me the error "method does not override any method from its superclass" which is wrong surely, animationDidStop is a member of CAAnimation class.

您正在您的视图控制器中实现它，并且 UIViewController 不提供 animationDidStop 的基本 class 实现，因此没有什么可以覆盖。

animationDidStop 是由 CAAnimationDelegate 协议定义的方法，因此 (a) 视图控制器应声明其符合该协议； (b) 不要使用 override 关键字。

CAShapeLayer 动画不会触发 animationDidStop

CAShapeLayer animation doesn't fire animationDidStop

animation

core-animation

swift

tvos