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post.swift

enum Storyboards: String {
    case MyStoryboard_1, MyStoryboard_2
    case MyStoryboard_3

    func instance() -> UIStoryboard {
        return UIStoryboard(name: self.rawValue, bundle: Bundle.main)
    }

    func initialViewController() -> UIViewController {
        return self.instance().instantiateInitialViewController()!
    }

    func viewControllerWithIdentifier(identifier: String) -> UIViewController {
        return self.instance().instantiateViewController(withIdentifier: identifier)
    }
}