ios - CAShapeLayer 线条的圆角

Question

我想在 View 中绘制带圆角的对角线。我的代码:

class DiagonalView: UIView {

// MARK: - Public Properties

@IBInspectable var fillColor: UIColor = UIColor.white {
    didSet {
        self.diagonalLayer.strokeColor = fillColor.cgColor
        self.redraw()
    }
}

@IBInspectable var lineWidth: CGFloat = 1 {
    didSet {
        self.diagonalLayer.lineWidth = lineWidth
        self.redraw()
    }
}

// MARK: - Private Properties

private var diagonalLayer: CAShapeLayer = {
    let layer = CAShapeLayer()
    layer.fillColor = UIColor.clear.cgColor
    layer.strokeColor = UIColor.white.cgColor
    layer.lineCap = kCALineCapRound
    layer.lineWidth = 1
    return layer
}()

// MARK: - Constructors

override func awakeFromNib() {
    super.awakeFromNib()
    self.layer.addSublayer(self.diagonalLayer)
    self.setupPath()
}

override func layoutSubviews() {
    super.layoutSubviews()
    self.setupPath()
}

// MARK: - Private methods

private func redraw() {
    self.setNeedsDisplay()
}

private func setupPath() {
    let startPoint = CGPoint(x: self.frame.width, y: 0)
    let endPoint = CGPoint(x: 0, y: self.frame.height)
    let path = UIBezierPath()
    path.move(to: startPoint)
    path.addLine(to: endPoint)
    path.close()
    self.diagonalLayer.path = path.cgPath
}

}

行位正确。但是角不是圆的。结果:

代码看起来不错，但我觉得我搞砸了……有什么建议吗？

Answer 1

我想我找到了问题所在。文档说:

线帽样式指定了描边时开放路径端点的形状。

你正在关闭你的路径。保持打开状态。