Unable to add NavigationBar on TabViewController - iphone

Question

I am unable to see NavigationBar on my TabView Controller.
I tried to add two tabs.
The class hierarchy is like below.
Please help.
ViewControllerOne : UIViewController
ViewControllerTwo : UIViewController
TabViewController : UITabBarController
ViewControllerOne *viewFirst = [[ViewControllerOne alloc]init];
ViewControllerOther *viewSecond = [[ViewControllerOther alloc]init];
[self.tabBarController.navigationController setViewControllers:#[viewFirst, viewSecond]];
[self.tabBarController.navigationController setTitle:#"TITLE TITLE"];
viewFirst.title=#"ONE";
viewFirst.tabBarItem.image = [UIImage imageNamed:#"first.png"];
viewSecond.title=#"TWO";
viewSecond.tabBarItem.image = [UIImage imageNamed:#"second.png"];
viewFirst.view.backgroundColor = [UIColor grayColor];
viewSecond.view.backgroundColor = [UIColor whiteColor];
self.viewControllers = [NSArray arrayWithObjects:viewFirst, viewSecond, nil];

Answer 1

I'm not sure what "self" is, but it looks like it is just a random view controller. More context on that would be good, but I'll try to throw some thoughts.
It looks like you're trying to set viewFirst and viewSecond as a navigation stack, rather then the two different tabs. It also appears like you aren't placing those controllers within UINavigationControllers. Try something more along these lines:
ViewControllerOne *one = [[ViewControllerOne alloc] init];
one.title = #"ONE";
one.tabBarItem.image = [UIImage imageNamed:#"first.png"];
one.view.backgroundColor = [UIColor grayColor];
UINavigationController *navOne = [[UINavigationController alloc] initWithRootViewController:one];
ViewControllerTwo *two = [[ViewControllerOne alloc] init];
two.title = #"SECOND";
two.tabBarItem.image = [UIImage imageNamed:#"second.png"];
two.view.backgroundColor = [UIColor whiteColor];
UINavigationController *navTwo = [[UINavigationController alloc] initWithRootViewController:two];
TabViewController *tabController = [[TabViewController alloc] init];
[tabController setViewControllers:#[navOne, navTwo] animated:NO];
Make sure that the tabController is the key UIWindow's root view controller.