Swift custom back button in navigation bar

Question

I am trying to use a custom image for my back button in the navigation bar. I am using the below code, which adds the image, but also keeps the text "Back" in the button. I want to also remove the text. Can I do that?

self.navigationController?.navigationBar.backIndicatorImage = UIImage(named: "icon-back")
self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = UIImage(named: "icon-back")
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.Plain, target: nil, action: nil)

Answer 1

Try code below :-)

func SetBackBarButtonCustom()
{
    //Back buttion
    let btnLeftMenu: UIButton = UIButton()
    btnLeftMenu.setImage(UIImage(named: "back_arrow"), for: UIControlState())
    btnLeftMenu.addTarget(self, action: #selector(UIViewController.onClcikBack), for: UIControlEvents.touchUpInside)
    btnLeftMenu.frame = CGRect(x: 0, y: 0, width: 33/2, height: 27/2)
    let barButton = UIBarButtonItem(customView: btnLeftMenu)
    self.navigationItem.leftBarButtonItem = barButton
}

func onClcikBack()
{
    _ = self.navigationController?.popViewController(animated: true)
}

Answer 2

If you want to add Back button in every UIViewController then you can add the code in UIViewController extension else you can use addBackButton() directly as follows.

extension UIViewController {

    func addBackButton() {
        let btnLeftMenu: UIButton = UIButton()
        let image = UIImage(named: "backButtonImage");
        btnLeftMenu.setImage(image, for: .normal)
        btnLeftMenu.setTitle("Back".localized, for: .normal);
        btnLeftMenu.sizeToFit()
        btnLeftMenu.addTarget(self, action: #selector (backButtonClick(sender:)), for: .touchUpInside)
        let barButton = UIBarButtonItem(customView: btnLeftMenu)
        self.navigationItem.leftBarButtonItem = barButton
    }

    func backButtonClick(sender : UIButton) {
        self.navigationController?.popViewController(animated: true);
    }
}

Make sure you should add the following file "backButtonImage.png" in your app bundle.

Call this method self.addBackButton()in your viewDidLoad method of your custom UIViewController class like this

override func viewDidLoad() {
         super.viewDidLoad()
         self.addBackButton()
 }

Note : if you don't add addBackButton Method in extension then you will need to add this method directly in the class and set target and Selector accordingly.