Init a UInavigationbar

I am having trouble in making a tableview with navigation bar or controller on top.

I have this piece of code,

- (void)viewDidLoad {
    [super viewDidLoad];

    UINavigationController *addNavCon = [[UINavigationController alloc]initWithNibName:@"Welcome" bundle:nil];
    self.navigationItem.rightBarButtonItem = self.addButtonItem;
    self.navigationItem.leftBarButtonItem = self.ed开发者_如何学编程itButtonItem;




    [self createEditableCopyOfDatabaseIfNeeded];    

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillTerminate:) name:UIApplicationWillTerminateNotification object:nil];

    NSString *documentDirectory = [self applicationDocumentsDirectory];
    NSString *path = [documentDirectory stringByAppendingPathComponent:@"notebook.plist"];

    NSMutableArray *tmpArray = [[NSMutableArray alloc] initWithContentsOfFile:path];
    self.Notes = tmpArray;
    [tmpArray release];



}

However, the navigation bar never show up, while the table is doing fine. May i know what's the problem with the code?

Many thanks

You have created an instance of UINavigationController but never added it to anything. You need to add it to the current hierarchy or it will not appear.

If you wish to add the navController to the entire app, then you should do this in the App Delegate by

- (void)applicationDidFinishLaunching:(UIApplication *)application

{

    UIViewController *rootController = [[MyRootViewController alloc] init];

    UINavigationController *navigationController = [[UINavigationController alloc]

                                initWithRootViewController:rootController];

    [rootController release];



    window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    [window addSubview:navigationController.view];

    [window makeKeyAndVisible];

}