Custom back button in UINavigationController

Question

For an application I\'m developing, I need to display a custom back button in a navigation bar. I have the button asset as a PNG image, and I\'m writing this code:

Answer 1

Starting with iOS 5, this is simple:

[[UIBarButtonItem appearance]
            setBackButtonBackgroundImage:[UIImage imageNamed:@"back_button.png"]
            forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

You can place that in your app delegate and it will set the background image to all back buttons in the app (for that control state and bar metrics, of course).