“Unrecognized selector sent to instance” error

Question

Part of my AppDelegate code is:

UITabBarController *tabBarController 
    = (UITabBarController *)self.window.rootViewController;

UINavigationController *na         


        

Answer 1

You are obviously receiving different type of object on index = 0.

If you are using storyboard go there and open Navigator > find specific controller > see Relationships. This order can be used when referencing its viewControllers collection.