add nav controller to tabbed application - iphone

Question

Good day. I try to add new tab with navigation controller to my app. I create a new tabbed app (xcode 4.2) and in appdelegate write this
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
UIViewController *viewController1 = [[[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil] autorelease];
UIViewController *viewController2 = [[[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil] autorelease];
NavController *navController = [[[NavController alloc] initWithNibName:#"NavController" bundle:nil] autorelease]; //my controller
self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, navController, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
NavController.h file
#interface NavController : UINavigationController
#end
Here the structure of project
And when I run project it show me empty tab
But in xib file I add lable and buttons
May be I forgot something?

Answer 1

Initialise your navigation controller with some UIViewController that is :
RootViewController *rootViewController = [[[RootViewController alloc] initWithNibName:#"RootViewController" bundle:nil] autorelease];
NavController *navController = [[[NavController alloc] initWithRootViewController: rootViewController] autorelease];
This might help.

Answer 2

i am sharing you my APP Code about this feature,Hope this can solve your Problem easily
Add this code in AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil] autorelease];
UINavigationController *localNavigationController;
tabBarController = [[UITabBarController alloc] init];
NSMutableArray *localControllersArray = [[NSMutableArray alloc] initWithCapacity:3];
viewController = [[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil] autorelease];
localNavigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
[localControllersArray addObject:localNavigationController];
AlaramClock *aAlaramClock = [[[AlaramClock alloc] initWithNibName:#"AlaramClock" bundle:nil] autorelease];
localNavigationController = [[UINavigationController alloc] initWithRootViewController:aAlaramClock];
[localControllersArray addObject:localNavigationController];
CurrentTime *aCurrentTime = [[[CurrentTime alloc] initWithNibName:#"CurrentTime" bundle:nil] autorelease];
localNavigationController = [[UINavigationController alloc] initWithRootViewController:aCurrentTime];
[localControllersArray addObject:localNavigationController];
Settings *aSettings = [[[Settings alloc] initWithNibName:#"Settings" bundle:nil] autorelease];
localNavigationController = [[UINavigationController alloc] initWithRootViewController:aSettings];
[localControllersArray addObject:localNavigationController];
tabBarController.viewControllers = localControllersArray;
[localControllersArray release];
// Override point for customization after app launch
[window addSubview:tabBarController.view];
[window makeKeyAndVisible];
return YES;
}
Then U will get this look
after this in Every ViewController.m
ADD this
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])
{
// Custom initialization
self.title=#"Calculate Time";
self.tabBarItem.title = #"Calculate Time";
self.tabBarItem.image=[UIImage imageNamed:#"time_calculate.png"];
}
return self;
}