[iOS]swift切某一边圆角

        //圆角半径
        let cornerRadius:CGFloat = 10.0
        //下面为设置圆角操作（通过遮罩实现）
        let shapeLayer = CAShapeLayer()
        view.layer.mask = nil
        let bounds = view.bounds
        let bezierPath = UIBezierPath(roundedRect: bounds,
                                      byRoundingCorners: [.topLeft,.topRight],
                                      cornerRadii: CGSize(width: cornerRadius,height: cornerRadius))
        shapeLayer.path = bezierPath.cgPath
        view.layer.mask = shapeLayer

        //圆角半径
        let cornerRadius:CGFloat = 10.0
        //下面为设置圆角操作（通过遮罩实现）
        let shapeLayer = CAShapeLayer()
        view.layer.mask = nil
        let bounds = view.bounds
        let bezierPath = UIBezierPath(roundedRect: bounds,
                                      byRoundingCorners: [.bottomLeft,.bottomRight],
                                      cornerRadii: CGSize(width: cornerRadius,height: cornerRadius))
        shapeLayer.path = bezierPath.cgPath
        view.layer.mask = shapeLayer