How can I change the font of the back button for my navigation bar?

Question

How can I change the font of the back button for my navigation bar.

The back button is either \"back\" or the title from the previous view controller.

I tho

Answer 1

SWIFT 3

    UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName: UIFont(name: "Open Sans", size: 15)!,NSForegroundColorAttributeName: UIColor.white]
    UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Open Sans", size: 15)!], for: UIControlState.normal)