swift-view任意位置添加边框线（实线，虚线）

废话不多说，直接代码

public struct UIRectSide : OptionSet {

    public let rawValue: Int

    public static let left = UIRectSide(rawValue: 1 << 0)

    public static let top = UIRectSide(rawValue: 1 << 1)

    public static let right = UIRectSide(rawValue: 1 << 2)

    public static let bottom = UIRectSide(rawValue: 1 << 3)

    public static let all: UIRectSide = [.top, .right, .left, .bottom]

    

    public init(rawValue: Int) {

        self.rawValue = rawValue;

    }

}

extension UIView{

    

    ///画虚线边框

    func drawDashLine(strokeColor: UIColor, lineWidth: CGFloat = 1, lineLength: Int = 10, lineSpacing: Int = 5, corners: UIRectSide) {

        let shapeLayer = CAShapeLayer()

        shapeLayer.bounds = self.bounds

        shapeLayer.anchorPoint = CGPoint(x: 0, y: 0)

        shapeLayer.fillColor = UIColor.blue.cgColor

        shapeLayer.strokeColor = strokeColor.cgColor

        

        shapeLayer.lineWidth = lineWidth

        shapeLayer.lineJoin = kCALineJoinRound

        

        //每一段虚线长度 和 每两段虚线之间的间隔

        shapeLayer.lineDashPattern = [NSNumber(value: lineLength), NSNumber(value: lineSpacing)]

        

        let path = CGMutablePath()

        if corners.contains(.left) {

            path.move(to: CGPoint(x: 0, y: self.layer.bounds.height))

            path.addLine(to: CGPoint(x: 0, y: 0))

        }

        if corners.contains(.top){

            path.move(to: CGPoint(x: 0, y: 0))

            path.addLine(to: CGPoint(x: self.layer.bounds.width, y: 0))

        }

        if corners.contains(.right){

            path.move(to: CGPoint(x: self.layer.bounds.width, y: 0))

            path.addLine(to: CGPoint(x: self.layer.bounds.width, y: self.layer.bounds.height))

        }

        if corners.contains(.bottom){

            path.move(to: CGPoint(x: self.layer.bounds.width, y: self.layer.bounds.height))

            path.addLine(to: CGPoint(x: 0, y: self.layer.bounds.height))

        }

        shapeLayer.path = path

        self.layer.addSublayer(shapeLayer)

    }

    ///画实线边框

    func drawLine(strokeColor: UIColor, lineWidth: CGFloat = 1, corners: UIRectSide) {

        

        if corners == UIRectSide.all {

            self.layer.borderWidth = lineWidth

            self.layer.borderColor = strokeColor.cgColor

        }else{

            let shapeLayer = CAShapeLayer()

            shapeLayer.bounds = self.bounds

            shapeLayer.anchorPoint = CGPoint(x: 0, y: 0)

            shapeLayer.fillColor = UIColor.blue.cgColor

            shapeLayer.strokeColor = strokeColor.cgColor

            

            shapeLayer.lineWidth = lineWidth

            shapeLayer.lineJoin = kCALineJoinRound

            

            let path = CGMutablePath()

            

            if corners.contains(.left) {

                path.move(to: CGPoint(x: 0, y: self.layer.bounds.height))

                path.addLine(to: CGPoint(x: 0, y: 0))

            }

            if corners.contains(.top){

                path.move(to: CGPoint(x: 0, y: 0))

                path.addLine(to: CGPoint(x: self.layer.bounds.width, y: 0))

            }

            if corners.contains(.right){

                path.move(to: CGPoint(x: self.layer.bounds.width, y: 0))

                path.addLine(to: CGPoint(x: self.layer.bounds.width, y: self.layer.bounds.height))

            }

            if corners.contains(.bottom){

                path.move(to: CGPoint(x: self.layer.bounds.width, y: self.layer.bounds.height))

                path.addLine(to: CGPoint(x: 0, y: self.layer.bounds.height))

            }

            

            shapeLayer.path = path

            self.layer.addSublayer(shapeLayer)

            

        }

        

    }

}

附：ios UIView 任意位置 裁剪 圆角
https://www.jianshu.com/p/8810ecb9500f