UITabBarController delegate methods never get called

I'm currently refactoring my iPad application and instead of a button on the NavigationBar, I would like to put my Logout button as a TabBar button item. All of my views are in a unique StoryBoard so I get my TabBar in my Appdelegate.m by this way : ``` // Add logout tab to tabbar storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; UITabBarController *tabbar = (UITabBarController *)[storyboard instantiateViewControllerWithIdentifier:@"tabbar"]; [tabbar setDelegate:self]; ``` Of course the delegate protocol is declared in my Appdelegate.h ``` @interface AppDelegate : UIResponder <UIApplicationDelegate, UITabBarControllerDelegate> ``` After that, I create an empty viewController in order to create my logout tab : ``` UIViewController *logout = [[UIViewController alloc]init]; ``` Then I get tabbar viewControllers as NSMutableArray and add my logout VC : ``` NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:[tabbar viewControllers]]; [viewControllers addObject:logout]; ``` Finally I set tabbar viewControllers with my new array : ``` [tabbar setViewControllers:viewControllers]; ``` I think that those steps are correct. So why does the didSelectViewController is not called when I change the displayed tab ? If it can help, here's my didSelectViewController method (which is write in AppDelegate.m) ``` - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController { NSLog(@"onglet sélectionné : %d / %d", [tabBarController selectedIndex], [[tabBarController viewControllers]count]); //select the index where your logout button is if ([tabBarController selectedIndex] == [[tabBarController viewControllers]count]-1) { NSLog(@"logout"); } } ``` Thanks in advance for your help !