导航控制器中的后退按钮不会更改为自定义图像

Question

I have two VC, the first of which is embedded in a NC. My second VC is presented using a push segue from my first VC. In my second VC, I am trying to change the back button to a custom image I have, but it is still using the default image and text in the navigation bar.

viewDidLoad() in my second VC:

override func viewDidLoad() {
    super.viewDidLoad()

    let back = UIImage(named: "back")
    self.navigationController!.navigationBar.backIndicatorImage = back
    self.navigationController!.navigationBar.backIndicatorTransitionMaskImage = back
    self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.plain, target: nil, action: nil)

    configureView()
}

Why is the following not changing the back button in my second VC?

Answer 1

The culprit is line that sets the backButtonItem , replacing anything you've done to the back button with a new back button. Just remove:

self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.plain, target: nil, action: nil)

Answer 2

Don't set the title to "" , if you do not need a title set the title to nil . Can't comment, not enough reputation, sorry. See from the docs:

"The item's title. If nil a title is not displayed."

Answer 3

You need to set it on the first view controller.

Calling the following code on your first view controller.

override func viewDidLoad() {
    super.viewDidLoad()

    let back = UIImage(named: "back")
    self.navigationController!.navigationBar.backIndicatorImage = back
    self.navigationController!.navigationBar.backIndicatorTransitionMaskImage = back
    self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.plain, target: nil, action: nil)

    configureView()
}

More details https://sarunw.com/posts/how-to-change-back-button-image/ https://sarunw.com/posts/how-to-remove-text-from-uinavigationbar-back-button/