Swift-animate CAshapeLayer笔触颜色

Question

我正试图找到一种方法来动画我正在创建的笔画的颜色

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(我创建它持续1秒),颜色将自动生成

Answer 1

找到解决方案.请享用.在创建CAShapeLayer之后当然:

    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")