resetApp.swift

func scene(
  _ scene: UIScene,
  willConnectTo session: UISceneSession,
  options connectionOptions: UIScene.ConnectionOptions
) {
  // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
  // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
  // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
  guard let scene = (scene as? UIWindowScene) else { return }

  let vc = buildViewController()

  #if UITESTING
  self.resetIfNeeded()
  #endif

  let window = UIWindow(windowScene: scene)
  window.rootViewController = vc
  window.makeKeyAndVisible()
  self.window = window
}

#if UITESTING
func resetIfNeeded() {
  guard UserDefaults.standard.bool(forKey: Arguments.reset.rawValue) else {
    return
  }

  // put the code to reset the state, remove eventual local files
  // and remove the keys from the UserDefaults, if any.
}
#endif