UIStoryboard extension to load a storyboard by means of a StoryboardRepresentable type

StoryboardRepresentable.swift

extension UIStoryboard {
    class func storyboard(storyboard: StoryboardRepresentable, bundle: NSBundle? = nil) -> UIStoryboard {
        return UIStoryboard(name: storyboard.storyboardName, bundle: bundle)
    }
}

protocol StoryboardRepresentable {
    var storyboardName: String { get }
}

extension StoryboardRepresentable where Self: RawRepresentable, Self.RawValue == String {
    var storyboardName: String {
        return self.rawValue
    }
}

enum ModulAStoryboardEnum: String, StoryboardRepresentable {
    case StoryboardA
    case StoryboardB
    case StoryboardC
}

enum ModulBStoryboardEnum: String, StoryboardRepresentable {
    case StoryboardA
    case StoryboardB
    case StoryboardC
}