Question

I have multiple tabs that each does something that may interfere with stuff going on the other tabs if not stopped. In case a user forgets to turn off function in one tab before going to the next tab, I want to know if there is a way to run a block of code from the UIViewController when the user clicks the other tab in the UITabBarController.

Answer 1

You should implement UITabBarControllerDelegate protocol in the view controller that has access to the business logic of your stuff. So you can do something when a user tries to click another tab.

It is very likely that you need to implement:

 – tabBarController:shouldSelectViewController:
 – tabBarController:didSelectViewController:

See documentations for UITabBarControllerDelegate.