Typed view controller and storyboard

vcs.swift

// Allows
// Storyboard.Main.viewController(MainVC)

enum Storyboard: String {
    case Main
    
    static let values = [Main]
    static var boards = [Storyboard:UIStoryboard]()
    
    func viewController<A: UIViewController>(type: A.Type) -> A {
        return storyboard.instantiateViewControllerWithIdentifier("\(A.self)") as! A
    }
    
    var storyboard: UIStoryboard {
        var storyboard: UIStoryboard!
        
        if let value = Storyboard.boards[self] {
            storyboard = value
        }
        else {
            storyboard = UIStoryboard(name: rawValue, bundle: .None)
            Storyboard.boards[self] = storyboard
        }
        
        return storyboard
    }
}