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

Johannes Fahrenkrug's Answer works, but the back image would appear at a very wired position.

Here I found a better way to position the image at the right place:

Make Sure You Have a back image with size 24x24(@1x) , I call it backImage

Execute the following code when your app Launch

UINavigationBar.appearance().barTintColor = nil
UINavigationBar.appearance().backIndicatorImage = backImage
UINavigationBar.appearance().backIndicatorTransitionMaskImage = backImage
UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -60), forBarMetrics: .Default)