Question

I have the following:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath(NSIndexPath*)indexPath
{

     audiChassisInputViewController = [[myAudiChassisInputViewController alloc] init];    

    [self.navigationController pushViewController:audiChassisInputViewController animated:YES];

    self.navigationController.navigationBarHidden = NO;

    UIBarButtonItem *retourButton = [[UIBarButtonItem alloc] initWithTitle:@"Retour" style:UIBarButtonItemStyleBordered target:self.navigationController action:@selector(popViewControllerAnimated:)]; 
    [self.navigationController.navigationBar.topItem setLeftBarButtonItem:retourButton];
    [self.navigationController.navigationBar.topItem setTitle:@"Chassis Input"];
    [retourButton release];

    [audiChassisInputViewController release];

}

and this workes…the new view is showed.

in the new view:

myAudiChassisInputViewController.h

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    chassisInputTextView.layer.cornerRadius = 15;
    chassisInputTextView.clipsToBounds = YES;
    [chassisInputTextView becomeFirstResponder];

    UIBarButtonItem *okButton = [[UIBarButtonItem alloc] initWithTitle:@"OK" style:UIBarButtonItemStyleBordered target:self action:@selector(chassisOkPressed)];  
    [self.navigationController.navigationBar.topItem setRightBarButtonItem:okButton];
    [okButton release];

}

I have no error, but there is no right bar button shown.Anyone, any idea why?

Answer 1

Change this line:

[self.navigationController.navigationBar.topItem setRightBarButtonItem:okButton];

with this line:

[[self navigationItem] setRightBarButtonItem:okButton];

---

The thing is, by the time viewDidLoad is executed, the top item of the navigation bar (self.navigationController.navigationBar.topItem) is still pointing to the navigation item of the back view controller.

The back view controller is the one that used to be the top view controller before the current top view controller was pushed onto the stack ([[viewControllers objectAtIndex:[viewControllers count] - 2] navigationItem]). The following snippet shows how the top item of the navigation bar is still pointing to the navigation item of the back view controller in viewDidLoad and it is for illustration purposes only:

// the view controllers currently on the navigation stack
NSArray *viewControllers = self.navigationController.viewControllers;
// The root view controller is at index 0 in the array, the back view controller is at index n-2, and the top controller is at index n-1, where n is the number of items in the array.
UIViewController *backViewController = [viewControllers objectAtIndex:[viewControllers count] - 2];
// get the navigation item of the back view controller
UINavigationItem *backNavigationItem = backViewController.navigationItem;
UINavigationItem *topItem = self.navigationController.navigationBar.topItem;
if  (backNavigationItem == topItem) {
    NSLog(@"This gets logged to the console");
}