UITableVIew not working with UINavigationController - objective-c

Question

I have encountered a very strange behavior, when I implemented navigationController.
I have a LogInViewController with an UITableView,where cells are populated like this:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 2;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == 0) {
return cellUsername;
}
if (indexPath.row == 1){
return cellPassword;
}
else{
return nil;
}
}
cellUsername and cellPassword are Cells which I created on .xib..
And when i add this LogInViewController as a rootViewController in my appDelegate it works fine!
I wanted to implement a navigationController, so I created RootViewController, with navController #property and in my appDelagate i called it like this
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
RootViewController *rootView = [[RootViewController alloc]init];
rootView.navController = [[UINavigationController alloc] initWithRootViewController:rootView];
self.window.rootViewController = rootView.navController;
[self.window makeKeyAndVisible];
return YES;
And in my RootViewController on viewDidLoad I have this code:
[super viewDidLoad];
self.navController = [[UINavigationController alloc]init];
LogInViewController *loginView = [[LogInViewController alloc]init];
[[self navigationController] pushViewController:loginView animated:YES];
It opens my LogInViewController,but only the first cell,cellUsername is added to my UiTableView, what is wrong?
Am still a beginner,so I might be missing something stupid probably.. but it works wihout navigationController,so am pretty confused..
Thank you!

Answer 1

I'm not sure if this has anything to do with your problem, but you shouldn't be using this line in your viewDidLoad:
self.navController = [[UINavigationController alloc]init];
Your RootViewController is already embedded in a navigation controller, so you can just use self.navigationController to get a reference to it.
I'm also not sure about this code, it may be ok, but it's not the way it's usually done:
RootViewController *rootView = [[RootViewController alloc]init];
rootView.navController = [[UINavigationController alloc] initWithRootViewController:rootView];
self.window.rootViewController = rootView.navController;
The usual way to do it is like this:
RootViewController *rootView = [[RootViewController alloc]init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:rootView];
self.window.rootViewController = nav;

Answer 2

in AppDelegate file
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
RootViewController *rootView = [[RootViewController alloc]init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:rootView];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
Further there is no need to create another navigationController in the viewDidLoad of the RootViewController class