Question

-(void)applicationDidFinishLaunching:(UIApplication *)application{

    [[[self.window.rootViewController.tabBarController.viewControllers objectAtIndex:1] tabBarItem]setBadgeValue:@"1"];
}

I use storyboard for UI and want to set notifications number for one of the tabbar items, but it seems that I do something wrong.

What is wrong with this code, why I don’t see the notification in the tabbar item?

Thanks in advance.

ANSWER:

FROM APPDELEGATE:
     UITabBarController *tabController = self.window.rootViewController;
        UIViewController *requiredViewController = [tabController.viewControllers objectAtIndex:1];
        UITabBarItem *item = requiredViewController.tabBarItem;
        [item setBadgeValue:@"1"];

Answer 1

Why is it all on one line?

Break it down into a few smaller steps, set a breakpoint on step one and walk through the code checking to see if what you expect is happening on each line.

UIViewController *rootController = self.window.rootViewController;
UITabBarController *tabController = rootController.tabBarController;
UIViewController *requiredViewController = [tabController.viewControllers objectAtIndex:1];
UITabBarItem *item = requiredViewController.tabBarItem;
[item setBadgeValue:@"1"];

I suspect that one of your properties is nil – this is usually the cause of ‘why does my method fail without any warning or error` type bugs.