UINavigationController TitleView - Need clarification - objective-c

Question

Okay, there's one thing I really don't understand.
I have a navigation controller (created in AppDelegate.m) as the first item in a tab bar controller (created in AppDelegate.h):
self.tabBarController.viewControllers = #[tabOneNavigationController, viewController2, viewController3, viewController4, viewController5];
In another class, I access this tabOneNavigationController by:
AppDelegate *apd = (AppDelegate *) [[UIApplication sharedApplication] delegate];
UINavigationController *navtab1 = [apd.tabBarController.viewControllers objectAtIndex:0];
And if I want to change the background of navtab1's navigation bar, I write:
[navtab1.navigationBar setBackgroundImage:navigationBackgroundImage forBarMetrics:UIBarMetricsDefault];
But for changing titleView, I've only seen examples using:
self.navigationItem.titleView = ...
but how do I do change navtab1's titleView?
Example: I have a custom TableViewCell, which contains a button, and when that button's clicked, it should change the titeView of navtab1 (in this case, self obviously doesn't have navigationItem property.

Answer 1

Here is use delegate methode of UINavigationController, This code might be helpful in your case:
#pragma mark -
#pragma mark - UINavigationController Delegate Methods
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
UINavigationBar *morenavbar = navigationController.navigationBar;
UINavigationItem *morenavitem = morenavbar.topItem;
morenavitem.titleView = myCustomeView; // Add Here your custom UIView.
morenavitem.rightBarButtonItem.tintColor = [UIColor blackColor];
}
In above Method you also put image/color of NavigationBar.