Setting a Custom Image for a Back Button on UINavigationBar

Question

I am trying to set a custom image for the back button that automatically gets place onto a navigation bar when a new view is pushed onto the stack.

I have tried add

Answer 1

This code worked for Swift 5 and XCode 10 :

Add this code to AppDelegate's func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool to Apply to all of your view controllers:

//Custom back button
    let barButtonItemAppearance = UIBarButtonItem.appearance()
    barButtonItemAppearance.setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.clear], for: .normal)
    barButtonItemAppearance.setTitleTextAttributes([NSAttributedStringKey.foregroundColor: UIColor.clear], for: .highlighted)
    let backImg: UIImage = UIImage(named: "back")!
    barButtonItemAppearance.setBackButtonBackgroundImage(backImg, for: .normal, barMetrics: .default)

    let image = UIImage()

    UINavigationBar.appearance().backIndicatorImage = image
    UINavigationBar.appearance().backIndicatorTransitionMaskImage = image