NavigationBar set TitleColor for one View - ios

Question

im facing the problem of setting the font-color of the title of one ViewController in swift and resetting it when it disappears. Currently I'm able to set the color from black to white with:
override func viewDidLoad() {
let textAttributes = [NSAttributedStringKey.foregroundColor:UIColor.white]
navigationController?.navigationBar.titleTextAttributes = textAttributes
}
override func viewWillDisappear(_ animated: Bool) {
let textAttributes = [NSAttributedStringKey.foregroundColor:UIColor.black]
navigationController?.navigationBar.titleTextAttributes = textAttributes
}
when I try resetting with UIColor.black it doesn't change anything.
when I try to set the whole appearance there is no change at all.
override func viewDidLoad() {
UINavigationBar.appearance().titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]
}
override func viewWillDisappear(_ animated: Bool) {
UINavigationBar.appearance().titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.black]
}
How can I still achieve this?
Using Xcode 10.0
Swift 4

Answer 1

Instead of adding the code to viewDidLoad(), add it into viewDidAppear(_:), i.e
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let textAttributes = [NSAttributedString.Key.foregroundColor:UIColor.white]
navigationController?.navigationBar.titleTextAttributes = textAttributes
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
let textAttributes = [NSAttributedString.Key.foregroundColor:UIColor.black]
navigationController?.navigationBar.titleTextAttributes = textAttributes
}

Answer 2

Thanks everybody for your help.
I got it working for me with another function:
override func willMove(toParentViewController parent: UIViewController?) {
var textAttributes: [NSAttributedString.Key : Any]?
if parent == nil{ // navigating back
textAttributes = [NSAttributedStringKey.foregroundColor:UIColor.black]
}else{
textAttributes = [NSAttributedStringKey.foregroundColor:UIColor.white]
}
navigationController?.navigationBar.titleTextAttributes = textAttributes
}
This functions is also called when a view is building up.
This solution worked for me and the colors are already set when the view is displayed.
I'm open for pro/cons responds to this.

Answer 3

you can use this function viewWillAppear in your code on any view
func navigationBarProperties(vc:UIViewController, title:String){
vc.navigationController!.navigationBar.isHidden = false
vc.navigationController!.navigationBar.isTranslucent = false
// text color
vc.navigationController!.navigationBar.tintColor = UIColor.white
// bar color
vc.navigationController!.navigationBar.barTintColor = UIColor.black
let isFont = UIFont.init(name: "Helvetica-bold", size: 15)
vc.navigationItem.title = title
vc.navigationController!.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1) ,NSAttributedStringKey.font: isFont!]
}
override open func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
//---nav bar customization----//
navigationBarProperties(vc: self, title: "Home")
}

Answer 4

Subclass UINavigationController and assign it to your navigationController:
class CustomNavigationController : UINavigationController {
let usualTextAttributes: [NSAttributedString.Key: Any] = [.foregroundColor: UIColor.red]
let customTextAttributes: [NSAttributedString.Key: Any] = [.foregroundColor: UIColor.blue]
private func updateTitleColorIfNeeded() {
if topViewController is MyCustomViewController {
navigationBar.titleTextAttributes = customTextAttributes
} else {
navigationBar.titleTextAttributes = usualTextAttributes
}
}
override func popViewController(animated: Bool) -> UIViewController? {
updateTitleColorIfNeeded()
return super.popViewController(animated: animated)
}
override func pushViewController(_ viewController: UIViewController, animated: Bool) {
updateTitleColorIfNeeded()
super.pushViewController(viewController, animated: animated)
}
}
If MyCustomViewController is root of the navigation controller, then set it's initial title color in viewDidLoad:
class MyCustomViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
navigationController?.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.yellow]
}
}