Swift extension for iOS to allow setting borders

UIView+Border.swift

extension UIView {
    public func addTopBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(0, 0, self.frame.size.width, width)
        self.layer.addSublayer(border)
    }
    
    public func addRightBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(self.frame.size.width - width, 0, width, self.frame.size.height)
        self.layer.addSublayer(border)
    }
    
    public func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(0, self.frame.size.height - width, self.frame.size.width, width)
        self.layer.addSublayer(border)
    }
    
    public func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.frame = CGRectMake(0, 0, width, self.frame.size.height)
        self.layer.addSublayer(border)
    }
}