AppStoryboard.swift

enum AppStoryboard: String {
    case Main
    
    var instance: UIStoryboard {
        return UIStoryboard(name: rawValue, bundle: Bundle.main)
    }
    
    func viewController<T: UIViewController>(of type: T.Type) -> T {
        return instance.instantiateViewController(withIdentifier: type.storyboardId) as! T
    }
}

extension UIViewController {
    class var storyboardId: String {
        return "\(self)"
    }
    
    // static func instantiate(from appStoryboard: AppStoryboard) -> Self {
    //     return appStoryboard.viewController(of: self)
    // }
}

protocol Instantiatable {}

extension Instantiatable where Self: UIViewController {
    static func instantiate() -> Self {
        return AppStoryboard.Main.viewController(of: self)
    }
}