Swift 3 Extension for adding border to one side of UIView

UIView+Border.swift

// This syntax reflects changes made to the Swift language as of Aug. '16

extension UIView {
    
    // Example use: myView.addBorder(toSide: .Left, withColor: UIColor.redColor().CGColor, andThickness: 1.0)
    
    enum ViewSide {
        case Left, Right, Top, Bottom
    }
    
    func addBorder(toSide side: ViewSide, withColor color: CGColor, andThickness thickness: CGFloat) {
        
        let border = CALayer()
        border.backgroundColor = color
        
        switch side {
        case .Left: border.frame = CGRect(x: frame.minX, y: frame.minY, width: thickness, height: frame.height); break
        case .Right: border.frame = CGRect(x: frame.maxX, y: frame.minY, width: thickness, height: frame.height); break
        case .Top: border.frame = CGRect(x: frame.minX, y: frame.minY, width: frame.width, height: thickness); break
        case .Bottom: border.frame = CGRect(x: frame.minX, y: frame.maxY, width: frame.width, height: thickness); break
        }
        
        layer.addSublayer(border)
    }
}

This doesn't work on all screen sizes. On bigger screens, it doesn't extend to the end of the border

Yeah, did you know how to solve it?

Also works for NSView. Only need to swap top and bottom, since the coordinate system origin on macOS is in the left bottom of a view.

And per Swift naming guidelines, case names should be lowerCamelCase.

Great job. need declare CALayer for using with NSView
`

     let layer = CALayer();

    self.myView.layer = layer;

    self.myView.wantsLayer = true

`

what if i want only 2 rounded corner (top left and top right ) with border on three sides(top , left and right)

@parveenkumar5 You can rewrite with OptionSet instead of Enum.