在应用启动（iOS）时弹出非根视图控制器

Question

I have a working application with a UITableViewController as a root view controller.

I need to pop a simple log-in screen on app launch,

and i can't set it as root view controller because it's against the project properties.

also, im using storyboard.

Answer 1

Simply, in root view controller (UITableViewController in your case) viewDidAppear's method, present log-in screen as modalViewController. You need to set the Identifier for your ViewController first.

   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard"
                                                 bundle:nil];
LoginViewController *lgn = [storyboard instantiateViewControllerWithIdentifier:@"LoginView"];
[self presentViewController:lgn animated:YES completion:NULL];

Use your own storyboard and viewController names.

Answer 2

In App Delegate

loginViewController = [[BANLoginViewController alloc] initWithNibName:@"BANLoginViewController" bundle:nil];

UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:loginViewController];

[window addSubView:[navController view]];
[window makeKeyAndVisible];

And in the BANLoginViewController you could check if the user is logged in or not and then initialise the main storyboard.