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In Obj-C / iOS. Our UI design calls for an initial screen with options to register or log on. After doing either of these, the user data is saved to the phone and a the tabBarController is shown. However, tapping on the tabBar at the bottom takes the view back to the “log on or register” screen. Is it possible to change the root view controller in a tabBarItem’s hiearchy?
You can’t change the root, but you can solve this a few ways. Perhaps the simplest is in your viewWillAppear method check to see if the user is logged in, if so, immediately load (using navigation controller, modally or just add a subView depending on your app’s structure), the regular logged in view without animation, then the user will never see that this happened. (You might choose to do it the other way, only load the login screen if the user is NOT logged in.)