I can't seem to get the 'TopRated' to show up.

Here is my code from AppDelegate

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
    if let tabBarController = window?.rootViewController as? UITabBarController {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "NavController")
        vc.tabBarItem = UITabBarItem(tabBarSystemItem: .topRated, tag: 1)
        tabBarController.viewControllers?.append(vc)
    }

    return true
}

I have "NavController" in the Navigation Controller Storyboard ID.

My version of xCode is 12.2.

Solved! Moved the above to SceneDelegate.

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    if let tabBarController = window?.rootViewController as? UITabBarController {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "NavController")
        vc.tabBarItem = UITabBarItem(tabBarSystemItem: .topRated, tag: 1)
        tabBarController.viewControllers?.append(vc)
    }

    guard let _ = (scene as? UIWindowScene) else { return }
}

Thank you for posting this as I had the same problem. If this is an update to Xcode that needs code to be changed then there needs to be a note on the tutorial about it. I'll message Paul.