How to add a right bar button to a navigation bar in iphone

Let assume, you have a UIViewController, like this:

UIViewController *vc = [UIViewController new];

And you added it to navigation controller:

UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:vc];

In this way rightBarButtonItem will NOT getting displayed:

nc.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"xyz" style:UIBarButtonItemStyleDone target:self action:@selector(xyz)];

BUT this way IT WILL appear:

vc.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"xyz" style:UIBarButtonItemStyleDone target:self action:@selector(xyz)];

Use your own viewcontroller instead of the navigationcontroller to refer navigationItem.

-(void)viewDidLoad
{ 
    [super viewDidLoad];
    app.navigationController.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(Add:)] autorelease];
}

-(IBAction)Add:(id)sender
{
    TAddNewJourney *j=[[TAddNewJourney alloc]init];
    [app.navigationController pushViewController:j animated:YES];
    [j release];
}

Try the other answers. I posted this answer so that it will work if your viewcontroller does not have a navigation controller which i think is the problem.