Swift Custom NavBar Back Button Image and Text

问题:

I need to customise the look of a back button in a Swift project.

Here's what I have:

Here's what I want:

I've tried creating my own UIBarButtonItem but I can't figure out how to get the image to be beside the text, rather than as a background or a replacement for the text.

let backButton = UIBarButtonItem(title: "Custom", style: .Plain, target: self, action: nil    )
//backButton.image = UIImage(named: "imageName") //Replaces title
backButton.setBackgroundImage(UIImage(named: "imageName"), forState: .Normal, barMetrics: .Default) // Stretches image
navigationItem.setLeftBarButtonItem(backButton, animated: false)

回答1:

You can do something like that:

let yourBackImage = UIImage(named: "back_button_image")
self.navigationController?.navigationBar.backIndicatorImage = yourBackImage
self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = yourBackImage
self.navigationController?.navigationBar.backItem?.title = "Custom"

Your image will only have one color though

回答2:

Note: Please remember that the back button belongs to the the source ViewController and not to the destination ViewController. Thus, the modification needs to be done in the source VC, which is reflected to all the view in the navigation controller

Code Snippet:

let backImage = UIImage(named: "icon-back")

self.navigationController?.navigationBar.backIndicatorImage = backImage

self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = backImage

/*** If needed Assign Title Here ***/
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.plain, target: nil, action: nil)

回答3:

swift 4

In my case, I needed to have only the image of the button, without any text. I hope this will be useful to someone.

let imgBackArrow = UIImage(named: "back_arrow_32")

navigationController?.navigationBar.backIndicatorImage = imgBackArrow
navigationController?.navigationBar.backIndicatorTransitionMaskImage = imgBackArrow

navigationItem.leftItemsSupplementBackButton = true
navigationItem.leftBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: self, action: nil)

For iOS 12 you can do

func setNavigationBar() {

    self.navigationItem.setHidesBackButton(true, animated:false)

    //your custom view for back image with custom size
    let view = UIView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
    let imageView = UIImageView(frame: CGRect(x: 10, y: 10, width: 20, height: 20))

    if let imgBackArrow = UIImage(named: "icn_back_arrow") {
        imageView.image = imgBackArrow
    }
    view.addSubview(imageView)

    let backTap = UITapGestureRecognizer(target: self, action: #selector(backToMain))
    view?.addGestureRecognizer(backTap)

    let leftBarButtonItem = UIBarButtonItem(customView: view ?? UIView())
    self.navigationItem.leftBarButtonItem = leftBarButtonItem
}

@objc func backToMain() {
    self.navigationController?.popViewController(animated: true)
}

回答4:

Having a button in Navigation Bar with Image AND Text is quite hard. Especially after they have introduced a new headache with UIBarButtonItem position in iOS 11: iOS 11 - UIBarButtonItem horizontal position

You can make either button with image or a button with text, but not a button with both of those. I even tried two UIBarButtonItems together, one with image and other with text - it still doesn't look good at all and their UIStackView can't be easily accessed for modification.

Unexpectedly I found a plain simple solution:

1) design the button as view in Interface Builder. In my case it is inside target UIViewController and accessible via IBOutlet for simplicity

2) set Leading Space constraint for the image to be negative, you might also want to set view's background color to .clear.

3) use it:

@IBOutlet var backButtonView: UIView!

override func viewDidLoad() {
    super.viewDidLoad()

    let backButton = UIBarButtonItem(customView: self.backButtonView)
    self.backButtonView.heightAnchor.constraint(equalToConstant: 44).isActive = true // if you set more than you'll get "Unable to simultaneously..."
    self.backButtonView.widthAnchor.constraint(equalToConstant: 75).isActive = true
    self.navigationItem.leftBarButtonItem = backButton
}

That's it. No need to use the trick with negative spacer for iOS 10 or the trick with imageInsets for iOS 11 (which works only if you have image and doesn't work for image+text, BTW).

回答5:

For the back button image:

• By this tutorial: (but didn't work for me)

  UINavigationBar.appearance().backIndicatorImage = UIImage(named: "imageName")
  

• But this stack answer: (worked for me)

  var backButtonImage = UIImage(named: "back-button-image")
  backButtonImage = backButtonImage?.stretchableImage(withLeftCapWidth: 15, topCapHeight: 30)
  UIBarButtonItem.appearance().setBackButtonBackgroundImage(backButtonImage, for: .normal, barMetrics: .default)
  

And for the font, assuming you want the font to match for the whole navigation bar:(currently in use)

if let font = UIFont(name: "Avenir-Book", size: 22) {
  UINavigationBar.appearance().titleTextAttributes = [NSFontAttributeName: font]
}

回答6:

swift 3

    extension UIViewController {

        func setBackButton(){
            let yourBackImage = UIImage(named: "backbutton")
            navigationController?.navigationBar.backIndicatorImage = yourBackImage
            navigationController?.navigationBar.backIndicatorTransitionMaskImage = yourBackImage
        }

    }

回答7:

Just replace the backButton with a custom rightBarButtonItem

let backImage = UIImage(named: "BackBtn")?.withRenderingMode(.alwaysOriginal)
    navigationItem.leftBarButtonItem = UIBarButtonItem(image: backImage, style: .plain, target: self, action: #selector(popnav))

    @objc func popnav() {
    self.navigationController?.popViewController(animated: true)
}

回答8:

I have tried all the above and all make the custom image without changing the text The only one worked for me is from this answer

let backBTN = UIBarButtonItem(image: UIImage(named: "Back"), 
                              style: .plain, 
                              target: navigationController, 
                              action: #selector(UINavigationController.popViewController(animated:)))
navigationItem.leftBarButtonItem = backBTN
navigationController?.interactivePopGestureRecognizer?.delegate = self

回答9:

Swift 4.2 Add this functions ViewController

func addNavigationBarButton(imageName:String,direction:direction){
    var image = UIImage(named: imageName)
    image = image?.withRenderingMode(.alwaysOriginal)
    switch direction {
    case .left:
       self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style:.plain, target: nil, action: #selector(goBack))
    case .right:
       self.navigationItem.rightBarButtonItem = UIBarButtonItem(image: image, style:.plain, target: nil, action: #selector(goBack))
    }
}

@objc func goBack() {
    navigationController?.popViewController(animated: true)
}

enum direction {
    case right
    case left
}

Using you should use here

viewDidLoad()

addNavigationBarButton(imageName: "ic_back", direction:.left)