ios - 以编程方式推送 UINavigationController 后顶部栏不可见

Question

在 AppDelegate 中，我检查是否存在用户，如果存在，我通过使用此代码推送 NavigationController 来“跳过”两个 ViewController:

if(currentUser){

    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

    UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"Test"];

    self.window.rootViewController = viewController;
    viewController.navigationController.navigationBarHidden = NO; // Tried this nothing happened.
    [self.window makeKeyAndVisible];

}
else{
    [PFUser enableAutomaticUser];
    [[PFUser currentUser] incrementKey:@"RunCount"];
    [[PFUser currentUser] saveInBackground];
    [[PFUser currentUser] fetch];


    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

    UINavigationController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"firstView"];

    self.window.rootViewController = viewController;
    [self.window makeKeyAndVisible];

}

所以 true 语句跳过两个 ViewController 并推送 UINavigationController。但是当它以这种方式显示时，没有顶部栏。

但是，如果没有用户，那么它将通过 segues 以“正常”方式继续到 UINavigationController，然后该栏可见。

我该如何解决这个问题？

谢谢!

Answer 1

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main"
 bundle:nil];
    UIViewController *viewController = [storyboard 
instantiateViewControllerWithIdentifier:@"Test"];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:viewController];
    self.window.rootViewController = nav;