add two navigation controller to one Tab bar Item

Question

I want 2 navigation Controller to be attached to one Tab bar item.

Basically the idea is to have 2 views on a single tab Item and there should be a navigation bar to

Answer 1

One way would be to create a UIViewController subclass that contains two navigation controllers and add that to the UITabBarController. Here's how you'd create and layout the navigation controllers in the UIViewController's -viewDidLoad method:

FirstViewController *firstViewController = [[FirstViewController alloc] init];
UINavigationController *firstNavigationController = [[UINavigationController alloc] initWithRootViewController:firstViewController];
[firstViewController release];

SecondViewController *secondViewController = [[SecondViewController alloc] init];
UINavigationController *secondNavigationController = [[UINavigationController alloc] initWithRootViewController:secondViewController];
[secondViewController release];

firstNavigationController.view.frame = CGRectMake(0.f, 0.f, 320.f, self.view.frame.size.height);
firstNavigationController.view.autoresizingMask = UIViewAutoresizingFlexibleHeight;

secondNavigationController.view.frame = CGRectMake(321.f, 0.f, self.view.frame.size.width - 321.f, self.view.frame.size.height);
secondNavigationController.view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth |
                                                   UIViewAutoresizingFlexibleRightMargin;

[self.view addSubview:firstNavigationController.view];
[self.view addSubview:secondNavigationController.view];

This is more or less how the UISplitViewController works under the hood.

Edit: you might need to add the following code to make sure it lays out properly:

- (void)viewWillAppear:(BOOL)animated { 
    [super viewWillAppear:animated];
    [firstNavigationController viewWillAppear:animated];
    [secondNavigationController viewWillAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated { 
    [super viewWillDisappear:animated];
    [firstNavigationController viewWillDisappear:animated];
    [secondNavigationController viewWillDisappear:animated];
}

- (void)viewDidAppear:(BOOL)animated { 
    [super viewDidAppear:animated];
    [firstNavigationController viewDidAppear:animated];
    [secondNavigationController viewDidAppear:animated];
}

- (void)viewDidDisappear:(BOOL)animated { 
    [super viewDidDisappear:animated];
    [firstNavigationController viewDidDisappear:animated];
    [secondNavigationController viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}