Question

I am adding multiple UISplitViewControllers to a single UITabBarController. The tabs appear, and each master/child view controller is loaded and displayed properly when the tab is clicked, BUT somehow user interaction only works on the last tab added.

If I add 1 tab, it works fine, but if I add 2 tabs, the 2nd one works and the 1st tab won’t respond to user interaction (nothing happens when clicking user interface elements – they don’t even highlight to show the click). If I add 3, the first 2 are break and the 3rd works.

How can I fix this? Here’s the code (note: this method is called from a splashpage view controller at the end of a startup routine):

- (void)startIPad 
{
    UINavigationController *localNavigationController;
    UISplitViewController *localSplitViewController;
    UITabBarController *tabBarController = [[UITabBarController alloc] init];
    NSMutableArray *localControllersArray = [[NSMutableArray alloc] init];

    //setup the first tab
    Master1ViewController *viewMaster1 = [[Master1ViewController alloc] init];
    Detail1ViewController *viewDetail1 = [[Detail1ViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:viewDetail1];
    localSplitViewController = [[UISplitViewController alloc] init];
    [localSplitViewController setDelegate:viewDetail1];
    localSplitViewController.viewControllers = [NSArray arrayWithObjects:viewMaster1, localNavigationController, nil];
    [localControllersArray addObject:localSplitViewController];
    [viewMaster1 release];
    [viewDetail1 release];
    [localNavigationController release];
    [localSplitViewController release];

    //setup the second tab
    Master2ViewController *viewMaster2 = [[Master2ViewController alloc] init];
    Detail2ViewController *viewDetail2 = [[Detail2ViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:viewDetail2];
    localSplitViewController = [[UISplitViewController alloc] init];
    [localSplitViewController setDelegate:viewDetail2];
    localSplitViewController.viewControllers = [NSArray arrayWithObjects:viewMaster2, localNavigationController, nil];
    [localControllersArray addObject:localSplitViewController];
    [viewMaster2 release];
    [viewDetail2 release];
    [localNavigationController release];
    [localSplitViewController release];

    //setup the third tab
    ...

    //setup the fourth tab
    ...

    //set the UISplitViewControllers onto the tab bar
    tabBarController.viewControllers = localControllersArray;
    [localControllersArray release];

    //switch to the new root view controller
    [appDelegate.window setRootViewController:tabBarController];
    [tabBarController release];
}

Answer 1

I have created a dummy app with your code and its working fine in my app. Just i have initialize the appDelegate like this

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    //self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
    //self.window.rootViewController = self.viewController;
    [self startIPad];
    [self.window makeKeyAndVisible];
    return YES;
}



- (void)startIPad
{
    UINavigationController *localNavigationController;
    UISplitViewController *localSplitViewController;
    UITabBarController *tabBarController = [[UITabBarController alloc] init];
    NSMutableArray *localControllersArray = [[NSMutableArray alloc] init];

    //setup the first tab
    Master1ViewController *viewMaster1 = [[Master1ViewController alloc] init];
    Detail1ViewController *viewDetail1 = [[Detail1ViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:viewDetail1];
    localSplitViewController = [[UISplitViewController alloc] init];
    [localSplitViewController setDelegate:viewDetail1];
    localSplitViewController.viewControllers = [NSArray arrayWithObjects:viewMaster1, localNavigationController, nil];
    [localControllersArray addObject:localSplitViewController];
    [viewMaster1 release];
    [viewDetail1 release];
    [localNavigationController release];
    [localSplitViewController release];

    //setup the second tab
    Master2ViewController *viewMaster2 = [[Master2ViewController alloc] init];
    Detail2ViewController *viewDetail2 = [[Detail2ViewController alloc] init];
    localNavigationController = [[UINavigationController alloc] initWithRootViewController:viewDetail2];
    localSplitViewController = [[UISplitViewController alloc] init];
    [localSplitViewController setDelegate:viewDetail2];
    localSplitViewController.viewControllers = [NSArray arrayWithObjects:viewMaster2, localNavigationController, nil];
    [localControllersArray addObject:localSplitViewController];
    [viewMaster2 release];
    [viewDetail2 release];
    [localNavigationController release];
    [localSplitViewController release];

    //setup the third tab
   // ...

    //setup the fourth tab
    //...

    //set the UISplitViewControllers onto the tab bar
    tabBarController.viewControllers = localControllersArray;
    [localControllersArray release];

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    //switch to the new root view controller
    [appDelegate.window setRootViewController:tabBarController];
    [tabBarController release];
}