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

Question

I want to add a right bar button item to the navigation bar, so that on click, it performs certain a function.

I have created the following code to add the right bar button item, but after it is done, the bar button item is not getting displayed in navigation bar:

-(void)viewDidload{     self.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]; } 

Answer 1

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.

Answer 2

-(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.