1 px边界UIBezierPath（roundedRect：byRoundingCorners :)

Question

如何为具有不同圆角的UIBezierPath获得干净的1 px边框？

在下面的例子中，我使用了3个角。代码在UIView内：

let borderLayer = CAShapeLayer()
borderLayer.frame = bounds
borderLayer.path = UIBezierPath(roundedRect: bounds, byRoundingCorners: [.topRight, .bottomLeft, .bottomRight], cornerRadii: CGSize(width: 24, height: 24)).cgPath
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.lineWidth = 1
borderLayer.strokeColor = UIColor.white.cgColor
layer.addSublayer(borderLayer)

结果有角度宽度问题：

Answer 1

插入1个像素，或在clipsToBounds = false中设置UIView。

let insetBounds = bounds.insetBy(dx: 1.0, dy: 1.0)
borderLayer.path = UIBezierPath(roundedRect: insetBounds, byRoundingCorners: [.topRight, .bottomLeft, .bottomRight], cornerRadii: CGSize(width: 24, height: 24)).cgPath