Some extention for UIViewContoller segue.

extension UIResponder {
    static var identifier: String {
        return String(describing: self)
    }
}

protocol Instance {
    associatedtype Instance
    static var sbName: String {get}
    static var instance: Instance {get}
}

extension Instance {
    static var sbName: String {return "Main"}
    static var instance: Instance {
        let storyboard = UIStoryboard(name: sbName, bundle: nil)
        let identifier = String(describing: Instance.self)
        let viewController = storyboard.instantiateViewController(withIdentifier: identifier)
        return viewController as! Instance
    }
}