add buttons(from code) on the Navigation Controller and make them disappear

Question

I have added a button from the code above \"view controller\":

@implementation HBViewController
.....
.....
.....

- (void)viewDidLoad
{
    [super view         


        

Answer 1

            //to disable

        self.navigationItem.rightBarButtonItem.enabled = NO;

            //to hide - hide means setting nil will remove that button

        self.navigationItem.rightBarButtonItem = nil;


            //if u want to show again then create and assign new button again

        okButton = [[UIBarButtonItem alloc] initWithTitle:@"Ok" 

                  style:UIBarButtonItemStyleBordered

                  target:self action:@selector(okayButtonPressed)];

        [self.navigationItem setRightBarButtonItem:okButton animated:NO];