custom tab bar controller not working? - iphone

Question

I am trying to build a custom tab bar controller but for some reason the views will not switch... The initial view is loaded properly. Here is my init method:
- (id)initWithNibName:(NSString *)nibNameOrNil
bundle:(NSBundle *)nibBundleOrNil
{
AccountViewController *accountViewController = [[AccountViewController alloc]
initWithNibName:#"AccountViewController" bundle:nil];
MoreViewController *moreViewController = [[MoreViewController alloc]
initWithNibName:#"MoreViewController" bundle:nil];
BarTabViewController *barTabViewController = [[BarTabViewController alloc]
initWithNibName:#"BarTabViewController" bundle:nil];
LocationsViewController *locationsViewController = [[LocationsViewController alloc]
initWithNibName:#"LocationsViewController" bundle:nil];
self.viewControllers = [NSArray arrayWithObjects:locationsViewController, accountViewController,
barTabViewController, moreViewController, nil];
[self.view addSubview:locationsViewController.view];
self.selectedController = locationsViewController;
return self;
}
Like I said, this will display the selected controller properly, however when the app launches and I try to switch views with the tab bar, the subview just become grey... I have been looking through several tutorials to try to figure out this issue, but it seems that I am doing it exactly the same. I have also checked the IB file to make sure my tabs are connected properly, they are. The following is the code to switch items:
- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
if (item == locationsTabBarItem) {
UIViewController *locationsController = [viewControllers objectAtIndex:0];
[self.selectedController.view removeFromSuperview];
[self.view addSubview:locationsController.view];
self.selectedController = locationsController;
}
else if (item == accountsTabBarItem) {
UIViewController *accountsController = [viewControllers objectAtIndex:1];
[self.selectedController.view removeFromSuperview];
[self.view addSubview:accountsController.view];
self.selectedController = accountsController;
}
else if (item == barTabTabBarItem) {
UIViewController *barTabController = [viewControllers objectAtIndex:2];
[self.selectedController.view removeFromSuperview];
[self.view addSubview:barTabController.view];
self.selectedController = barTabController;
}
else {
UIViewController *moreController = [viewControllers objectAtIndex:3];
[self.selectedController.view removeFromSuperview];
[self.view addSubview:moreController.view];
self.selectedController = moreController;
}
}

Answer 1

try With this one
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.selectedIndex = 0;
self.tabBarController.viewControllers = [NSArray arrayWithObjects:locationsViewController, accountViewController,
barTabViewController, moreViewController, nil];
self.tabBarController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self.navigationController pushViewController:delegate.tabBarController animated:YES];