custom back button in navigation in iOS - ios

Question

I know this question has been asked before but nothing worked for me and I had to ask it again.
I want an image as my back button in navigation bar, just want to change the appearance of the back button. I don't want to add a button and add selectors for it.
I tried the following code:
let backImage = UIImage(named: "Back_button")
let backAppearance = UIBarButtonItem.appearance()
backAppearance.setBackButtonBackgroundImage(backImage, for: .normal, barMetrics: .default)
navigationController?.navigationBar.backIndicatorTransitionMaskImage = backImage
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItem.Style.plain, target: nil, action: nil)
I also tried setting the back image and back mask using storyboard but both these approaches place a black circle on my back image.
I tried setting another image as back mask by setting its alpha content equal to zero using the code but it didn't work either.
please help.

Answer 1

let backButton = UIBarButtonItem()
backButton.title = "Back"
backButton.image = UIImage(named: "Back_button")
self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton
You can do this to customize your Back button. And you don't have to worry about adding selectors.

Answer 2

This code works with Swift 5.
let backButton: UIButton = UIButton()
backButton.setImage(UIImage(named: "back"), for: UIControl.State())
backButton.addTarget(self, action:#selector(SearchResultsViewController.onBack), for: UIControl.Event.touchUpInside)
let leftBarButtonItem = UIBarButtonItem(customView: backButton)
navigationItem.leftBarButtonItem = leftBarButtonItem

Answer 3

I used this code to customize the back button on only one of my views:
self.navigationController?.navigationBar.topItem?.backButtonTitle = ""
let backButton = UIBarButtonItem(image: UIImage(named: "back"), style: .plain, target: self, action: #selector(goBack))
navigationItem.leftBarButtonItem = backButton
#objc func goBack() {
self.navigationController?.popViewController(animated: true)
}

Answer 4

Create a custom class for define navigation bar traits
Create an extension to UINavigationController for configure it
import UIKit
private final class MyNavigationBarTraits {
public var backIndicatorImage: UIImage?
public var backIndicatorTransitionMaskImage: UIImage?
public func apply(to navigationBar: UINavigationBar) {
navigationBar.backIndicatorImage = backIndicatorImage
navigationBar.backIndicatorTransitionMaskImage = backIndicatorTransitionMaskImage
}
public init(navigationBar: UINavigationBar) {
backIndicatorImage = navigationBar.backIndicatorImage
backIndicatorTransitionMaskImage = navigationBar.backIndicatorTransitionMaskImage
}
}
public typealias Callback<T> = (_: T) -> Void
public extension UINavigationController {
private struct AssociationKeys {
static var navigationBarTraits = "ws_nc_navigationBarTraits"
}
private var navigationBarTraits: MyNavigationBarTraits? {
get {
return objc_getAssociatedObject(self, &AssociationKeys.navigationBarTraits) as? MyNavigationBarTraits
}
set {
objc_setAssociatedObject(self, &AssociationKeys.navigationBarTraits, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
func configureBar(block: Callback<UINavigationBar>) {
navigationBarTraits = MyNavigationBarTraits(navigationBar: navigationBar)
block(navigationBar)
}
func resetBar() {
navigationBarTraits?.apply(to: navigationBar)
navigationBarTraits = .none
}
}
And then you can configure your navigation bar in your ViewController's viewWillAppear (for example tintColor)
public override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.configureBar { navigationBar in
// You can customize your navigation bar in here!
navigationBar.tintColor = .red
}
}
If you want to use this customization just in one View Controller you should reset bar in your View Controller's viewWillDisappear
public override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
navigationController?.resetBar()
}

Answer 5

Simply Add Below Methods in Your ViewController :
func setLeftBarBackItem() {
let leftBarBackItem = UIBarButtonItem(image: #imageLiteral(resourceName: "imgBack"), style: .plain, target: self, action: #selector(self.clickToBtnBackItem(_:)))
self.navigationItem.leftBarButtonItem = leftBarBackItem
}
func clickToBtnBackItem(_ sender: UIBarButtonItem) {
view.endEditing(true)
_ = navigationController?.popViewController(animated: true)
}
func setTranspertNavigation()
{
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.isTranslucent = true
self.navigationController?.view.backgroundColor = .clear
}
Inside Your ViewController's ViewDidLoad Method, Set backButton As :
self.navigationController?.isNavigationBarHidden = false
AppDelegate.shared().setupNavigationBar()
setLeftBarBackItem()
setTranspertNavigation()
self.title = "Title Here"