Extension to add a shadow to a UIView

UIView+Shadow.swift

extension UIView {

    /**
     Set a shadow on a UIView.
     - parameters:
        - color: Shadow color, defaults to black
        - opacity: Shadow opacity, defaults to 1.0
        - offset: Shadow offset, defaults to zero
        - radius: Shadow radius, defaults to 0
        - viewCornerRadius: If the UIView has a corner radius this must be set to match
    */
    func setShadowWithColor(color: UIColor?, opacity: Float?, offset: CGSize?, radius: CGFloat, viewCornerRadius: CGFloat?) {
        //layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: viewCornerRadius ?? 0.0).CGPath
        layer.shadowColor = color?.CGColor ?? UIColor.blackColor().CGColor
        layer.shadowOpacity = opacity ?? 1.0
        layer.shadowOffset = offset ?? CGSize.zero
        layer.shadowRadius = radius ?? 0
    }
}