UINavigationController rightbarbuttonitem not showing - objective-c

Question

after going through the questions related to UINavigationController item i came to post my exact problem ..
firstly i am not add a UINavigationController in MainWindow.xib i created and adding UINavigationController in AppDelegate file
after that in a UIViewController (not in rootViewController) class I have to add a rightbarbutton of Done type I am
adding it in a searchbarDelegate Method showing as bold:-
- (void) searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar {
//This method is called again when the user clicks back from teh detail view.
//So the overlay is displayed on the results, which is something we do not want to happen.
if(exhibDataObj.searching)
return;
//Add the overlay view.
if(ovController == nil)
ovController = [[OverlayViewController alloc] initWithNibName:#"OverlayView" bundle:[NSBundle mainBundle]];
CGFloat yaxis = self.navigationController.navigationBar.frame.size.height;
CGFloat width = self.view.frame.size.width;
CGFloat height = self.view.frame.size.height;
//Parameters x = origion on x-axis, y = origon on y-axis.
CGRect frame = CGRectMake(0, yaxis, width, height);
ovController.view.frame = frame;
ovController.view.backgroundColor = [UIColor grayColor];
ovController.view.alpha = 0.5;
ovController.rvController = self;
[self.theTableView insertSubview:ovController.view aboveSubview:self.parentViewController.view];
exhibDataObj.searching = true;
letUserSelectRow = NO;
self.theTableView.scrollEnabled = NO;
//Add the done button.
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemDone
target:self action:#selector(doneSearching_Clicked:)];
}
but this never works .
Any help will be more appreciable.

Answer 1

I've tested your code real quick and it seems to be working fine for me, however, I've had the same problem once back then it turned out I was setting the rightBarButtonItem to nil in my viewDidLoad method after setting it to a button. you should make sure your not making the same mistake somehow.
However if that does not work for you you can always try setting a custom button to it:
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 5, 30, 30)];
button.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"done.png"]];
[button addTarget:self action:#selector(doneButtonClicked) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *customItem = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationController.visibleViewController.navigationItem.rightBarButtonItem = customItem;