title: Initial screen on iOS simulator is black
body: <p>I have UIViewController that i created programmatically. This is the code. Even after setting my SignUpViewController background to white. I am getting black screen on launch</p>
  <pre><code>func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -&gt; Bool {
          // Override point for customization after application launch.
          startWindowLoad()
          return true
      }
  
  //extension with the starter function 
  extension AppDelegate {
      func startWindowLoad () {
          let startView = SignUpViewController()
          let navView = UINavigationController()
          navView.pushViewController(startView, animated: true )
          window = UIWindow(frame: UIScreen.main.bounds)
          window?.makeKeyAndVisible()
          window?.rootViewController = startView
          
      }
  }
  </code></pre>