Add button to top UITabBarController

Question

I have an app which has a UITabBarController as rootviewcontroller. The UITabBarController has four items. The four UIViewConotrollers are embedded in UINavigationControllers. I can add a button or image on the UINavigationController. However, I have to repeat 4 times on each UINavigationController for the same button or image. Is it possible I can add a button or image on the top of UITabBarController which is set as rootviewcontroller? Thanks in advance.

Answer 1

Theoretically, you can do it by:

UIButton *button = ; // your button
button.frame = CGRect(...); // position on the screen, where you want to have the button

[rootViewController addSubview:button];

However, this solution is strongly not recommended.

What you can do instead, is to create an abstract class MyViewControllerWithButton : UIViewController which will implement viewDidAppear: creation of UIButton and adding it to the navigationBar.

All the viewControllers that you use in tab bars will be a subclass of MyViewControllerWithButton.