[問題] swift畫線條後如何清除

[duckscorpion (歆)]

目的是用動畫讓Label移動並劃出軌跡

但是再次實行後無法消除上次留下的軌跡

用setNeedsLayout或setNeedsDisplay都無效

另外還想問問還有什麼方式可以不使用ＣＡ開頭的物件來作動畫效果

因為裡面的keyPath官方文件都沒有相關資料可查效果


下面是我的code

self.view.setNeedsLayout()
self.view.layer.setNeedsLayout()
let path=UIBezierPath()
...
let anim=CAKeyframeAnimation(keyPath:"position")
anim.path=path.cgPath
anim.repeatCount=1
anim.duration=5.0
self.myLabel.layer.add(anim, forKey: "Path")

let progressLine = CAShapeLayer()
progressLine.path = path.cgPath
progressLine.strokeColor = UIColor.blue.cgColor
progressLine.fillColor = UIColor.clear.cgColor
progressLine.lineWidth = 10.0

let animateStrokeEnd = CABasicAnimation(keyPath: "strokeEnd")
animateStrokeEnd.duration = 5.0
animateStrokeEnd.fromValue = 0.0
animateStrokeEnd.toValue = 1.0
progressLine.add(animateStrokeEnd, forKey: "animate stroke end animation")
self.view.layer.addSublayer(progressLine)

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推 darktt: 可以看UIView.amimations()，或UIProertyAnimator
推 kkk003: 要remove layer吧
→ yuanruo: 給shapeLayer一個name 然後找subLayers,一樣name就remove
→ duckscorpion: 感謝  已順利清除