我有UIBezierPath的线条抽屉
let line = CAShapeLayer()
line.path = UIBezierPath(arcCenter: center,
radius: radius,
startAngle: CGFloat(114.0/180.0) * .pi,
endAngle: .pi,
clockwise: true).cgPath
line.lineWidth = LINE_WIDTH
line.strokeColor = UIColor.red.withAlphaComponent(0.9).cgColor
line.fillColor = UIColor.clear.cgColor
我尝试通过添加一些新的CAShapeLayer()
来转角let corner = CAShapeLayer()
corner.path = UIBezierPath(arcCenter: coordByCorner(114.0*1.00035),
radius: LINE_WIDTH/2,
startAngle: CGFloat(114.0/180.0) * .pi,
endAngle: CGFloat(114.0/180.0 + 1) * .pi,
clockwise: false).cgPath
corner.strokeColor = UIColor.clear.cgColor
corner.fillColor = UIColor.red.withAlphaComponent(0.9).cgColor
line.addSublayer(corner)
但我认为这是一个非常糟糕的变体,当我更改图层的颜色时,颜色会随着timeInterval的不同而变化。
此外,这一切看起来像这样:
P.S。:1.00035用于消除层之间的间隙。并且alpha需要< 1.0(0.1 - 0.9),那么它的不透明度如何?
答案 0 :(得分:2)
通过添加kCALineCapRound
解决了问题let line = CAShapeLayer()
line.path = UIBezierPath(arcCenter: center,
radius: radius,
startAngle: CGFloat(114.0/180.0) * .pi,
endAngle: .pi,
clockwise: true).cgPath
line.lineWidth = LINE_WIDTH
line.strokeColor = UIColor.red.withAlphaComponent(0.9).cgColor
line.fillColor = UIColor.clear.cgColor
line.lineCap = kCALineCapRound // this parameter solve my problem
答案 1 :(得分:1)
这样做的一个简单方法是创建向前移动所需cornerRadius
的路径,用两倍粗线划线,并应用圆线连接样式。
let layer = CAShapeLayer()
layer.strokeColor = UIColor.lightGray.cgColor
layer.fillColor = UIColor.lightGray.cgColor
layer.lineWidth = 2.0 * cornerRadius
layer.lineJoin = kCALineJoinRound
layer.path = getSemicirclePath(
arcCenter: arcCenter,
radius: radius,
cornerRadius: cornerRadius
)
func getSemicirclePath(arcCenter: CGPoint, radius: CGFloat, cornerRadius: CGFloat) -> CGPath {
let path = UIBezierPath(
arcCenter: CGPoint(x: arcCenter.x, y: arcCenter.y - cornerRadius),
radius: radius - cornerRadius,
startAngle: .pi,
endAngle: 2.0 * .pi,
clockwise: true
)
path.close()
return path.cgPath
}
以下是示例结果: