Swift 2 Extension for adding a border to one side of a UIView object

UIView+Border.swift

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 = CGRectMake(CGRectGetMinX(frame), CGRectGetMinY(frame), thickness, CGRectGetHeight(frame))
            break
        case .Right: border.frame = CGRectMake(CGRectGetMaxX(frame), CGRectGetMinY(frame), thickness, CGRectGetHeight(frame))
            break
        case .Top: border.frame = CGRectMake(CGRectGetMinX(frame), CGRectGetMinY(frame), CGRectGetWidth(frame), thickness)
            break
        case .Bottom: border.frame = CGRectMake(CGRectGetMinX(frame), CGRectGetMaxY(frame), CGRectGetWidth(frame), thickness)
            break
        }
        
        layer.addSublayer(border)
    }
}