Swift: How do I create a custom UINavigationBar and add a custom back button? - ios

Question

I am trying to create a custom navigationBar.
I am hiding the original navigationBar in viewWillAppear like so:
override func viewWillAppear(_ animated: Bool) {
self.navigationController?.isNavigationBarHidden = true
}
I am subclassing UINavigationBar like so:
let navBar: UINavigationBar = {
let view = UINavigationBar()
view.backgroundColor = .clear
view.isTranslucent = true
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
In viewDidLoad I am calling setupNavBar():
func setupNavBar() {
view.addSubview(navBar)
self.navBar.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: 80)
let backButton = UIBarButtonItem(image: UIImage(named:"backThick"), style: .plain, target: self, action: #selector(popControllerOffStack))
}
The problem is that backButton is added to the original navigationBar that is being hidden. This makes me think I am incorrectly creating the navigationBar. How do I add the button to navBar?
Updated Code (still not working):
class CustomNavBar: UINavigationBar {
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = .red
}
}
// In the viewController
let navBar = CustomNavBar()
override func viewDidLoad() {
super.viewDidLoad()
setupNavBar()
}
func setupNavBar() {
view.addSubview(navBar)
navBar.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: 80)
let backButton = UIBarButtonItem(image: UIImage(named:"backThick"), style: .plain, target: self, action: #selector(popControllerOffStack))
self.navigationItem.leftBarButtonItem = backButton
}
The button is being added to the original navigationBar.

Answer 1

You are not subclassing UINavigationBar. Rather, you are creating a new instance of UINavigationBar and modifying its properties inside a computed variable. This means each time you access navBar, you are initializing a new UINavigationBar object.
To create a subclass:
class MyCustomNavigationBar: UINavigationBar {
// Set properties in here after initialization
}
Once you have a proper subclass created, You can initialize an instance like so:
var navBar = MyCustomNavigationBar()
Finally, add your button to the navigation bar:
let backButton = UIBarButtonItem(image: UIImage(named:"backThick"), style: .plain, target: self, action: #selector(popControllerOffStack))
// Assuming 'self' is an instance of UINavigationController()
self.navigationItem.leftBarButtonItem = backButton
See the official Swift Programming Language Guide on Inheritance.

Answer 2

Swift 3.0
You can set custom Back button as like below
self.navigationItem.hidesBackButton = true
let backButton = UIBarButtonItem(image: UIImage(named: "image_name"), style: .plain, target: self, action: #selector(Class.methodName))
backButton.tintColor = UIColor.white
self.navigationItem.leftBarButtonItem = backButton

Answer 3

Also you can try below code:
let btnLeftMenu: UIButton = UIButton()
btnLeftMenu.setImage(UIImage(named: "image_name"), for:UIControlState())
btnLeftMenu.addTarget(self, action: #selector(moveImage), for:UIControlEvents.touchUpInside)
btnLeftMenu.frame = CGRect(x: 0, y: 0, width: 25, height: 25)
let barButton = UIBarButtonItem(customView: btnLeftMenu)
self.navigationItem.leftBarButtonItem = barButton*