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有一个CAShapeLayerCAGradientLayer不画形式掩盖
,当我将它作为一个面具我得到一个空白屏幕
这里是我的代码:
let width: CGFloat = frame.width
let radius: CGFloat = (width - 35)/2
let poing = CGPoint(x: width/2, y: radius + 8)
let path = UIBezierPath(arcCenter: poing, radius: (width - 35)/2,
startAngle: CGFloat(180).toRadians(),
endAngle: CGFloat(360).toRadians(),
clockwise: true)
let mask = CAShapeLayer()
mask.path = path.cgPath
mask.lineWidth = 8
mask.strokeStart = 0
mask.strokeEnd = 1
mask.lineCap = kCALineCapRound
mask.fillColor = UIColor.clear.cgColor
mask.strokeColor = progressColor.cgColor
let gradient = CAGradientLayer()
gradient.frame = CGRect(x: 0, y: 0, width: frame.width, height: frame.height)
gradient.startPoint = CGPoint(x: 0, y: 1)
gradient.endPoint = CGPoint(x: 1, y: 1)
gradient.colors = [UIColor.white, UIColor.blue]
gradient.mask = mask
layer.addSublayer(gradient)
我不明白为什么它不起作用。