Combining Navigation Controller with Tab Bar Controller - ios

Question

As I mentioned in the title, I want to add Navigation Controller to my application which already has a Tab Controller. So trying to do the staff something like on this page. Anyway, something is wrong. UINavigationController is looking a blank page, even if has a view and some libraries.
Let me begin from the stracht:
In my AppDelegate, I'm setting tab bar controllers like this:
#interface MYAppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#property (strong, nonatomic) UITabBarController *tabBarController;
#end
And here is .m file:
#implementation MYAppDelegate
#synthesize window = _window;
#synthesize tabBarController = _tabBarController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
application.applicationSupportsShakeToEdit = YES;
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UINavigationController *viewController1 = [[[MYMainViewController alloc] init] initWithNibName: #"MYMainViewController" bundle:nil];
UIViewController *viewController2 = [[[MYPageViewController alloc] init] initWithNibName:#"MYPageViewController" bundle:nil];
UIViewController *viewController3 = [[[MYSearchViewController alloc] init] initWithNibName:#"MYSearchViewController" bundle:nil];
UIViewController *viewController4 = [[[MYPersonViewController alloc] init] initWithNibName:#"MYPersonViewController" bundle:nil];
// Initialize tabBarController and add ViewControllers
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects: viewController1, viewController2,
viewController3, viewController4, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
Then, here is MYMainViewController implementaion which is a UINavigationController:
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(#"%#", [self navigationController]); // Logging null
}
My .xib file has a UINavigationController and and there is a view in it. Althought it, when I worked the app, there is blank page and untitled navigation bar. What am I doing wrong?
If I could see the content of my view, I want to navigate between two view controllers by using back button.
Any help or approach would be great for me.

Answer 1

Try to remove navigation controller from xib, so it only have view controller, then initialize navigation controller programatically:
UIViewController *tmpViewController1 = [[[YourViewController alloc] init] initWithNibName:#"YourViewController" bundle:nil];
UINavigationController *viewController1 = [[UINavigationController alloc] initWithRootViewController:tmpViewController1];