iOS-swift3.0 点滴积累：设置控件指定角为圆角

项目中用到只设置label的左下角和右下角为圆角，用UIBezierPath实现，记录一下。

       let corner = UIRectCorner(rawValue: UIRectCorner.bottomLeft.rawValue | UIRectCorner.bottomRight.rawValue)
        let maskPath = UIBezierPath(roundedRect: label.bounds, byRoundingCorners: corner, cornerRadii: CGSize(width: 4, height: 4))
        let maskLayer = CAShapeLayer()
        maskLayer.frame = label.bounds
        maskLayer.path = maskPath.cgPath
        label.layer.mask = maskLayer

其中，corner是设置具体哪个角为圆角 ：UIRectCorner.bottomLeft， UIRectCorner.bottomRight， UIRectCorner.topLeft，UIRectCorner.topRight

 let corner = UIRectCorner(rawValue: UIRectCorner.bottomLeft.rawValue | UIRectCorner.bottomRight.rawValue)

以下为实现效果图