parseArguments.swift

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
 
  func scene(
    _ scene: UIScene,
    willConnectTo session: UISceneSession,
    options connectionOptions: UIScene.ConnectionOptions
  ) {
    // ... 
    
    // create the view controller we need
    let vc = buildViewController()
    
    let window = UIWindow(windowScene: scene)
    window.rootViewController = vc
    window.makeKeyAndVisible()
    self.window = window
  }
  
  func buildViewController() -> UIViewController {

    #if UITESTING
    // Parse the parameter using userDefaults
    let initialScreen = UserDefaults.standard.string(forKey: "initialScreen")
    
    // Switch over the possible values
    if initialScreen == "home_screen" {
      return HomeViewController()
    }
    return LegalViewController()
    #endif
    
    return LegalViewController()
  }
}