NavigationController done button is not showing - iphone

Question

When i press the infobutton on the mainviewcontroller it shows navbar and uitextview modally but doesn't shows done button.
- (void) modalViewAction:(id)sender
self.view = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]autorelease];
[self.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
_viewController = [[ModalViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:_viewController];
navigationController.navigationBar.tintColor = [UIColor brownColor];
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(Done:)] autorelease];
[self.navigationController presentModalViewController:self.viewController animated:YES];
[navigationController release];
Anyone have ideas why is that Done Button is missing from the navigationcontroller.
Thanks for help.

Answer 1

Your presenting it Modally:
[self.navigationController presentModalViewController:self.viewController animated:YES];
You need to push it onto the navigation stack:
[self.navigationController pushViewControler:self.viewController animated:YES];
Now the NavigationController will take care of the back button for you.

Answer 2

You have to either:
push the view controller onto the navigation controller (as Hubert
explained), or
create a new UINavigationController and set the
viewController as the rootViewController of that
UINavigationController and then you can do:
[self.navigationController
presentModalViewController:newNavigationController animated:YES];

Answer 3

I added following statement
[_viewController.navigationItem setLeftBarButtonItem:button animated:YES];
to the below code and now Done button is showing on the navigation controller
- (void) modalViewAction:(id)sender
{
self.view = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]autorelease];
[self.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
_viewController = [[ModalViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:_viewController];
UIBarButtonItem * button = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemDone target:self action:#selector(dismissView:)] autorelease];
[_viewController.navigationItem setLeftBarButtonItem:button animated:YES];
navigationController.navigationBar.tintColor = [UIColor brownColor];
[self.navigationController presentModalViewController:self.viewController animated:YES];
[self.view addSubview:navigationController.view];
[navigationController release];
}
So my issue is solved.
Thanks for help