swift - Swift-动画CAshapeLayer笔触颜色

我正试图找到一种方法，使我正在创建的笔划的颜色具有动画效果。

circleLayer = CAShapeLayer()
circleLayer.path = circlePath.CGPath
circleLayer.lineCap =  kCALineCapRound
circleLayer.fillColor = UIColor.clearColor().CGColor
CABasicAnimation fill = CABasicAnimation.
circleLayer.strokeColor = UIColor(red: 0.4, green: 1.0, blue: 0.2, alpha: 0.5).CGColor
circleLayer.lineWidth = 20.0;
circleLayer.lineJoin = kCALineJoinRound
// Don't draw the circle initially
circleLayer.strokeEnd = 0.0

// Add the circleLayer to the view's layer's sublayers
layer.addSublayer(circleLayer)

我想要实现的是：当它被创建时（我创建它的持续时间是1秒），颜色将自动设置动画。

最佳答案

找到解决方案。享受吧。当然，在创建cashapelayer之后：

        let animcolor = CABasicAnimation(keyPath: "strokeColor")
        animcolor.fromValue         = UIColor.greenColor().CGColor
        animcolor.toValue           = UIColor.orangeColor().CGColor
        animcolor.duration          = 1.0;
        animcolor.repeatCount       = 0;
        animcolor.autoreverses      = true
        circleLayer.addAnimation(animcolor, forKey: "strokeColor")

关于swift - Swift-动画CAshapeLayer笔触颜色，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/26604578/