     public func add(into containerView: UIView,
                     with insets: UIEdgeInsets = .zero,
                     in viewPositioning: ViewPositioning = .front,
-                    layout: LayoutMode = LayoutMode.constraints) {
+                    layout: LayoutMode = .constraints) {
         
         switch layout {
         case .constraints:

            By default, 0.
     - parameter rightOffset: Offset from the view's right border to where the border should start.
            By default, 0.
     - parameter layout: Enum indicating whether to use constraints or frames. By default, constraints.
     
     - note: If you decide to use constraints to determine the size, self's frame doesn't need to be final.
             Because of this, it can be used in `loadView()`, `viewDidLoad()` or `viewWillAppear(animated:)`.

            By default, 0.
     - parameter rightOffset: Offset from the view's right border to where the border should start.
            By default, 0.
     - parameter layout: Enum indicating the layout mode. By default, .constraints.
     
     - note: If you decide to use constraints to determine the size, self's frame doesn't need to be final.
             Because of this, it can be used in `loadView()`, `viewDidLoad()` or `viewWillAppear(animated:)`.
