selecting alternative first view controller from story board at application startup

Question

I\'ve just started on iOS programming and so far the tutorials and answers I found here have been a great help to move forward. However, this particular problem has been bum

Answer 1

I have a similar scenario as yours. My application uses a UINavigationController as the root view controller. If the user is logged in, I want to present him/her with NotLoggedInViewController, while if it's logged in I want to show the LoggedInViewController.

In a storyboard a UINavigationController can only have one child, so you have to be able to programmatically assign another root view controller to it.

I start by creating a custom navigation controller class, let's name it MyNavigationController. In the storyboard I assign this custom class to the navigation controller object.

Still in the storyboard, I then model both view controllers, and connect one of them to the navigation controller object. Since I need to be able to access them from my code later on, I assign each of them an identifier using the XCode inspector on the right. These identifiers which can be arbitrary strings, but to things simple I just use the class names.

Finally I then implement the viewDidLoad method on MyNavigationController class:

BOOL isLoggedIn = ...;

- (void)viewDidLoad {
  id rootController;
  if (isLoggedIn) {
    rootController = [self.storyboard instantiateViewControllerWithIdentifier:@"LoggedInViewController"];
  } else {
    rootController = [self.storyboard instantiateViewControllerWithIdentifier:@"NotLoggedInViewController"];
  }
  self.viewControllers = [NSArray arrayWithObjects:rootController, nil];
}