Swift 4 : Navigation Bar looks different for the next page - ios

Question

I just removed the navigation bar shadow line with the following code :
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
When I use this code and I try to open another page which belongs to the same navigation controller, its navigation bar looks different. I'm trying to set the same navigation bar background color and tint color, but it doesn't work. However, when I remove these codes, all the pages that I use work normally. How can I fix this issue?
Screenshots :

Answer 1

It's common behaviour. When you set backgroundImage then it's not possible to set new colour. You need to set setBackgroundImage to nil and then set new colour that you want inside next ViewController.
This library can help you to do it easily https://github.com/MoZhouqi/KMNavigationBarTransition
PS: See an example by the link
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
configureAppearance()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
configureAppearance()
}
func configureAppearance() {
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
}
}
class SecondViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
configureAppearance()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
configureAppearance()
}
func configureAppearance() {
self.navigationController?.navigationBar.setBackgroundImage(nil, for: UIBarMetrics.default)
self.navigationController?.navigationBar.barTintColor = UIColor.yellow
}
}

Answer 2

It looks like your navigation bar is translucent but your view controller doesn't extend behind it so you need the window which defaults to black.
Either
Check the box to extend the VC under top bars in interface builder
Change UIApplication.shared.keyWindow?.backgroundColor to .white
Make your nav bar opaque