Question

In my iOS app I have a tabBarController with a few navigationControllers. In applicationDidFinishLaunching tabBarController.selectedViewController is null. This is after I assign the navigationControllers to the tabBar’s tabBarItems.

What is an appropriate default value for tabBarController.selectedViewController?

Perhaps it can be set to the first navigationController. Might need to be careful of the app launching from the background (in which case the user might not have left off at the first navigationController).

Answer 1

From the documentation for UITabBarController, under selectedViewController:

This view controller is the one whose custom view is currently
displayed by the tab bar interface. The specified view controller must
be in the viewControllers array. Assigning a new view controller to
this property changes the currently displayed view and also selects an
appropriate tab in the tab bar. Changing the view controller also
updates the selectedIndex property accordingly. The default value of
this property is nil.