How do I transition/animate color of UINavigationBar?

Question

I have been searching for how to transition/animate the barTintColor of a UINavigationBar for a while now, and I only see different answers. Some use <

Answer 1

in 10 iOS it works imperfectly :(

Subclass your navigation controller to use statusbarstyle of visible view controller:

class MyNavigationController: UINavigationController {
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return visibleViewController!.preferredStatusBarStyle
    }
}

Override preferredStatusBarStyle in Root controller and add function to set styles before pop animation:

private var _preferredStyle = UIStatusBarStyle.default;
override var preferredStatusBarStyle: UIStatusBarStyle {
    get {
        return _preferredStyle
    }
    set {
        _preferredStyle = newValue
        self.setNeedsStatusBarAppearanceUpdate()
    }

}


func animateNavigationColors(){
        self.setBeforePopNavigationColors()
        transitionCoordinator?.animate(alongsideTransition: { [weak self](context) in
            self?.setNavigationColors()
            }, completion: nil)
    }

func setBeforePopNavigationColors() {
    //Override in subclasses
}

In first controller:

override func setBeforePopNavigationColors() {
    navigationController?.navigationBar.tintColor = UIColor.white
    navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
    self.preferredStatusBarStyle = UIStatusBarStyle.lightContent
}

override func setNavigationColors(){
    navigationController?.navigationBar.barTintColor = UIColor.white
    navigationController?.navigationBar.tintColor = UIColor.black
    navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.black]
    navigationController?.navigationBar.barStyle = UIBarStyle.default
    self.preferredStatusBarStyle = UIStatusBarStyle.default
}

In second:

  override func setNavigationColors(){
        navigationController?.navigationBar.barTintColor = UIColor.black
        navigationController?.navigationBar.tintColor = UIColor.white
        navigationController?.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor: UIColor.white]
        navigationController?.navigationBar.barStyle = UIBarStyle.black
        self.preferredStatusBarStyle = UIStatusBarStyle.lightContent
    }

Example project: https://github.com/josshad/TestNavBarTransition