Swift - CABasicAnimation 完成时更新 UIButton

Question

我想说的是当 CAbasicanimation 完成时选择了按钮的位置。动画在按下某个按钮时开始。

单击按钮时，我将按钮标记值存储到整数“currentSelectedMarker”中。这确实有效并提供了想要的结果，但是如果在动画未完成之前按下另一个按钮，它将更新该单击的按钮而不是具有动画的原始按钮。

我知道这是因为“currentSelectedMarker”的值在按下任何按钮时都会更新，但是当动画完成时更新正确按钮的方法是什么。下面是我用于动画的代码。

func AutoUpRadial(button: UIButton, height: Int, value: Int){

    let trackLayer = CAShapeLayer()

    let radius = height / 3
    let circularPath = UIBezierPath(arcCenter: button.center, radius: CGFloat(radius), startAngle: 0, endAngle: 2 * CGFloat.pi, clockwise: true)
    trackLayer.path = circularPath.cgPath

    trackLayer.strokeColor = UIColor.black.cgColor
    trackLayer.opacity = 0.3
    trackLayer.fillColor = UIColor.clear.cgColor
    trackLayer.lineWidth = 5
    trackLayer.strokeEnd = 0

    mainScrollView.layer.addSublayer(trackLayer)

    autoUpFillRadial(value: value, tmpBtn: button, shape: trackLayer)
}

@objc private func autoUpFillRadial(value: Int, tmpBtn: UIButton, shape: CAShapeLayer){

    let basicAnimation = CABasicAnimation(keyPath: "strokeEnd")
    basicAnimation.toValue = 1
    basicAnimation.duration = CFTimeInterval(value)
    basicAnimation.fillMode = .forwards
    basicAnimation.isRemovedOnCompletion = true
    basicAnimation.delegate = self

    shape.add(basicAnimation, forKey: "basic")
}

func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {

    if let tmpButton = self.view.viewWithTag(currentSelectedMarker) as? UIButton {
        tmpButton.isSelected = false
    }
}

据我所知，“currentSelectedMarker”是问题所在，但我什至不确定这是否是解决问题的最佳方法。任何帮助表示赞赏。

谢谢

Answer 1

使用下面的setValue:forKey: 方法将您的Button tag 添加到CABasicAnimation 并从代表处获取。

@objc private func autoUpFillRadial(value: Int, tmpBtn: UIButton, shape: CAShapeLayer){

            let basicAnimation = CABasicAnimation(keyPath: "strokeEnd")
            basicAnimation.toValue = 1
            basicAnimation.duration = CFTimeInterval(value)
            basicAnimation.fillMode = .forwards
            basicAnimation.isRemovedOnCompletion = true
            basicAnimation.setValue(tmpBtn.tag, forKey: "animationID")
            basicAnimation.delegate = self

            shape.add(basicAnimation, forKey: "basic")
        }

        func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
            if let tag = anim.value(forKey: "animationID") as? Int {
                if let tmpButton = self.view.viewWithTag(tag) as? UIButton {
                    tmpButton.isSelected = false
                }
            }

        }