have a universal bar button item in navigationController

Question

I Have UINavigationController in my app, I want to have a right UIBarButtonItem to be shown in all navigation bar that appear in my application. this button will load menu, so I don't want to add this button in every navigation bar manually, also as the function is loading menu, I don't want to copy/past action for this button.

is there any way to handle this in ViewController.h and .m ?

so the button act as a universal bar button item?

Answer 1

What you can do is subclass the navigation controller. Here is an example

@interface NavigationController : UINavigationController
@end

@interface NavigationController () <UINavigationBarDelegate>
@end

@implementation NavigationController

- (void)viewDidLoad
{
    [super viewDidLoad];
    for (UIViewController* viewController in self.viewControllers){
        // You need to do this because the push is not called if you created this controller as part of the storyboard
        [self addButton:viewController.navigationItem];         
    }
}

-(void) pushViewController:(UIViewController *)viewController animated:(BOOL)animated{
    [self addButton:viewController.navigationItem];
    [super pushViewController:viewController animated:animated];
}

-(void) addButton:(UINavigationItem *)item{
    if (item.rightBarButtonItem == nil){
        item.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(action:)];
    }
}

-(void) action:(UIBarButtonItem*) button{

}

@end