好吧，我需要帮助。 我显然错过了非常明显的东西。
我读了将近30条关于这个确切错误的文章，但是这个应用程序仍然困扰着我。 我几乎复制了Anypic应用程序（Parse.com）的导航流程，因为它与我想在我的应用程序中做的非常相似。 首先，Anypic认为他们可以将tabBar控制器推到视图控制器上，据我所知这是行不通的，因此在我的实现中，我将其模态呈现。
我正在使用情节提要！ 并获得对每个视图控制器的引用，如下所示：
self.storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
CustomViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"VC"];
这是错误：尝试在视图不在窗口层次结构中的NFWelcomeViewController上呈现UITabBarController！
请帮忙！
NFWelcomeViewController
-(void)viewDidLoad {
[super viewDidLoad];
// If not logged in, present login view controller
if (![PFUser currentUser]) {
[self performSegueWithIdentifier:@"showLogin" sender:self];
}
else {
// Present Notified UI
// [(AppDelegate*)[[UIApplication sharedApplication] delegate] presentTabBarController];
[self performSegueWithIdentifier:@"tabBar" sender:self];
// Refresh current user with server side data -- checks if user is still valid and so on
[[PFUser currentUser] refreshInBackgroundWithTarget:self selector:@selector(refreshCurrentUserCallbackWithResult:error:)];
}
}
AppDelegate（我现在已经对此进行了注释，理想情况下，我想像Anypic一样实现它）
- (void)presentLoginViewControllerAnimated:(BOOL)animated {
NSLog(@"present login");
NFLoginViewController *loginViewController = [[NFLoginViewController alloc] init];
[loginViewController setDelegate:self];
loginViewController.fields = PFLogInFieldsFacebook | PFLogInFieldsUsernameAndPassword;
loginViewController.facebookPermissions = @[ @"basic_info", @"email" ];
[self.welcomeViewController presentViewController:loginViewController animated:YES completion:NULL];
// [self.welcomeViewController presentViewController:loginViewController animated:YES completion:nil];
}
- (void)presentLoginViewController {
[self presentLoginViewControllerAnimated:YES];
}
- (void)presentTabBarController {
NSLog(@"present tabBar");
self.tabBarController = [self.storyboard instantiateViewControllerWithIdentifier:@"tabBar"];
[self.welcomeViewController.navigationController pushViewController:self.tabBarController animated:NO];
[self.navController setViewControllers:@[ self.welcomeViewController, self.tabBarController ] animated:NO];
[[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeBadge|
UIRemoteNotificationTypeAlert|
UIRemoteNotificationTypeSound];
}