1.

extension UIView{    func addCorner(conrners: UIRectCorner , radius: CGFloat) {        let maskPath = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: conrners, cornerRadii: CGSize(width: radius, height: radius))        let maskLayer = CAShapeLayer()        maskLayer.frame = self.bounds        maskLayer.path = maskPath.cgPath        self.layer.mask = maskLayer    }}

 

 

2. 使用。 controller 在

override func viewDidLayoutSubviews() {        super.viewDidLayoutSubviews()        //指定位置切圆角        self.bgview.jy.addCorner(conrners: [.topLeft , .topRight], radius: 6)    }

 

 

自定义view 在 draw方法里面写

override func draw(_ rect: CGRect) {    super.draw(rect)

　　self.bgview.jy.addCorner(conrners: [.topLeft , .topRight], radius: 6)

}