J'ai eu ce CAShapeLayer tracer une ligne dans un tableau pour moi:gradient Ajouter à CAShapeLayer
open func generateLayer(path: UIBezierPath) -> CAShapeLayer {
let lineLayer = CAShapeLayer()
lineLayer.lineJoin = lineJoin.CALayerString
lineLayer.lineCap = lineCap.CALayerString
lineLayer.fillColor = UIColor.clear.cgColor
lineLayer.lineWidth = lineWidth
lineLayer.strokeColor = lineColors.first?.cgColor ?? UIColor.white.cgColor
lineLayer.path = path.cgPath
if dashPattern != nil {
lineLayer.lineDashPattern = dashPattern as [NSNumber]?
}
if animDuration > 0 {
lineLayer.strokeEnd = 0.0
let pathAnimation = CABasicAnimation(keyPath: "strokeEnd")
pathAnimation.duration = CFTimeInterval(animDuration)
pathAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
pathAnimation.fromValue = NSNumber(value: 0 as Float)
pathAnimation.toValue = NSNumber(value: 1 as Float)
pathAnimation.autoreverses = false
pathAnimation.isRemovedOnCompletion = false
pathAnimation.fillMode = kCAFillModeForwards
pathAnimation.beginTime = CACurrentMediaTime() + CFTimeInterval(animDelay)
lineLayer.add(pathAnimation, forKey: "strokeEndAnimation")
} else {
lineLayer.strokeEnd = 1
}
return lineLayer
}
Maintenant, je voudrais attirer cette ligne avec un gradient au lieu d'une seule couleur. C'est ce que j'ai trouvé, mais malheureusement, ça ne me trompe pas. Sans ce code ajouté (lineColors.count == 1), la ligne est dessinée correctement avec une seule couleur.
fileprivate func show(path: UIBezierPath) {
let lineLayer = generateLayer(path: path)
layer.addSublayer(lineLayer)
if lineColors.count > 1 {
let gradientLayer = CAGradientLayer()
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
gradientLayer.frame = self.bounds
gradientLayer.colors = lineColors
gradientLayer.mask = lineLayer
layer.addSublayer(gradientLayer)
}
}