change UITabBar.appearance().tintColor at runtime - swift

Question

I want to allow the user to change the whole App-Color.
But whenever I select a color it is only changed after the App will be restarted.
Is there any option to change the color at runtime?
I've set up a Button with a function like this to create a ColorPicker
#IBAction func colorChange(_ sender: UIButton) {
// Initializing Color Picker
let picker = UIColorPickerViewController()
// Setting the Initial Color of the Picker
picker.selectedColor = UIColor(named: "MyGreen")!
// Setting Delegate
picker.delegate = self
// Presenting the Color Picker
self.present(picker, animated: true, completion: nil)
}
And when the user picked a color, I make the changes in this function
func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
defaults.set(viewController.selectedColor, forKey: "myColor")
UITabBar.appearance().tintColor = viewController.selectedColor
}
To change the color at startup I've implemented this in AppDelegate
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
var myColor = defaults.color(forKey: "myColor")
if myColor == nil {
myColor = UIColor(named: "MyGreen")
}
UITabBar.appearance().tintColor = myColor
return true
}

Answer 1

Someone gave me an Article to read how it can be done.
https://zamzam.io/protocol-oriented-themes-for-ios-apps/
I've ended up doing it like this:
func colorPickerViewControllerDidFinish(_ viewController: UIColorPickerViewController) {
defaults.set(viewController.selectedColor, forKey: "myColor")
apply(for: UIApplication.shared, color: viewController.selectedColor)
}
by adding this function
func apply(for application: UIApplication, color: UIColor) {
UITabBar.appearance().tintColor = color
application.windows.reload()
}
and these extensions
public extension UIWindow {
/// Unload all views and add back.
/// Useful for applying `UIAppearance` changes to existing views.
func reload() {
subviews.forEach { view in
view.removeFromSuperview()
addSubview(view)
}
}
}
public extension Array where Element == UIWindow {
/// Unload all views for each `UIWindow` and add back.
/// Useful for applying `UIAppearance` changes to existing views.
func reload() {
forEach { $0.reload() }
}
}
If it's good or not I don't know - but it worked for me.

Answer 2

have you try using UITabBar.appearance().barTintColor ?