Question

I need some idea or starting point to the following question:

I have an app which starts with an TabBarView – in some Tabs there are different Views / ViewControllers which are connected by seques.
If the active Tab is changed, i want the (now) open Tab to load the “Start”-View/ViewController of this Tab, not the View/ViewController which was last active on this Tab.
How can i do that?

Answer 1

I suggest you look at using the UITabBarDelegate method: tabBarController:didSelectViewController:

combined with the UINavigationController method: popToRootViewControllerAnimated:

So when the user selects a tab, you can ensure that the navigation begins from the root controller.

EDIT IN RESPONSE TO COMMENT:

It’s not an ideal situation, but you can reference the UITabBarController in the app delegate. E.g.:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Get reference to Tab Bar Controller as the root view
    UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;

    // Set Delegate
    tabBarController.delegate = self;

    return YES;
}

You can then implement the UITabBarDelegate method similar to:

-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
    // Pop to root if the selected controller is a navigation controller.
    if ([viewController isKindOfClass:[UINavigationController class]]) {
        [((UINavigationController *)viewController) popToRootViewControllerAnimated:NO];
    }
}

I haven’t tested this though!