如何在UIView的虚线边框上添加角半径

Question

我有一个圆形的 UIView 我在上面加了一个虚线描边。

,,,
    var view = CAShapeLayer()
    view.strokeColor = UIColor.red.cgColor
    view.lineDashPattern = [2, 2]
    view.frame = addphotoView.bounds
    view.fillColor = nil
    view.path = UIBezierPath(rect: addphotoView.bounds).cgPath
    view.cornerRadius = 16
    view.masksToBounds = true

    addphotoView.layer.addSublayer(yourViewBorder)

但是 view.cornerRadius 没有达到预期的效果。

角落被擦掉了

Answer 1

快速回答

你应该四舍五入 Layers path.

像这样。

borderLayer.path = UIBezierPath(roundedRect: addphotoView.bounds, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: 16, height: 16)).cgPath

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更好的回答使用扩展

你可以将所有这些逻辑移到一个扩展中。

extension UIView {
    @discardableResult
    func addLineDashedStroke(pattern: [NSNumber]?, radius: CGFloat, color: CGColor) -> CALayer {
        let borderLayer = CAShapeLayer()

        borderLayer.strokeColor = color
        borderLayer.lineDashPattern = pattern
        borderLayer.frame = bounds
        borderLayer.fillColor = nil
        borderLayer.path = UIBezierPath(roundedRect: bounds, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: radius, height: radius)).cgPath

        layer.addSublayer(borderLayer)
        return borderLayer
    }
}

Usage:

addphotoView.addLineDashedStroke(pattern: [2, 2], radius: 16, color: UIColor.gray.cgColor)