Storyboardを使ったDIもどき

StoryboardDependencySample.swift

final class ViewController: UIViewController {
    // MARK: - Private Property
    private var dependency: Int!

    // MARK: - Initilizer
    static func initiate(dependency: Int) -> ViewController {
        let viewController = UIStoryboard.instantiateInitialViewController(from: self)
        viewController.dependency = dependency
        return viewController
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

extension UIStoryboard {
    public static func instantiateInitialViewController<T>(from className: T.Type) -> T where T : UIViewController {
        let name = String(describing: className.self)
        guard let viewController = UIStoryboard(name: name, bundle: .main).instantiateInitialViewController() as? T else {
            fatalError("型が不一致")
        }
        return viewController
    }
}