Question

我想创建一个圆圈消失的动画，我做了以下代码（基于我在互联网上找到的其他代码）。

class CircleView: UIView {
    private var circleLayer: CAShapeLayer?

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.commonInit()
    }

   required init?(coder aDecoder: NSCoder) {
       super.init(coder: aDecoder)
       self.commonInit()
    }

    func commonInit() {
        self.tintColor = UIColor.lightGrayColor()
        self.backgroundColor = UIColor.clearColor()
    }

    override func drawRect(rect: CGRect) {
        super.drawRect(rect)
        self.drawCircle()
        self.addCircleAnimation()
     }

     func drawCircle() {
         let size:CGFloat = CGFloat(100)
         self.circleLayer?.removeFromSuperlayer()
         self.circleLayer = CAShapeLayer()
         self.circleLayer?.frame = self.bounds
         let radius = size / 2;
         let path = UIBezierPath(arcCenter: CGPointMake(size / 2, size / 2), radius: radius, startAngle: -CGFloat(M_PI) / 4, endAngle: 2 * CGFloat(M_PI) - CGFloat(M_PI) / 4, clockwise: true)
         self.circleLayer?.path = path.CGPath
         self.circleLayer?.fillColor = UIColor.clearColor().CGColor
         self.circleLayer?.strokeColor = self.tintColor.CGColor
         self.circleLayer?.lineWidth = CGFloat(2.0)
         self.circleLayer?.rasterizationScale = 2.0 * UIScreen.mainScreen().scale
         self.circleLayer?.shouldRasterize = true

         self.layer.addSublayer(self.circleLayer!)
      }



      func addCircleAnimation() {

           let animation = CABasicAnimation(keyPath: "strokeStart")
           animation.fromValue = 0.0
           animation.toValue = 1.0

           animation.duration = CFTimeInterval(floatLiteral: 1)
           animation.removedOnCompletion = false
           animation.fillMode = kCAFillModeBackwards
           animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)

           animation.beginTime = CACurrentMediaTime()
           animation.delegate = self
           self.circleLayer?.addAnimation(animation, forKey:"strokeStart")

      }
   }

然而，当动画结束时，它会离开原始圆圈，即使我用animationDidStop检测到它仍然有闪烁效果。这段代码出了什么问题？

Answer 1

删除圆圈图层的代码：

localArray.count

动画将原始图像保留在最后

1 个答案: