Hide Navigation bar separator line on iOS 13 - ios

Question

I have a view controller with a navigation bar with a large title. When I push the controller, only on iOS 13 is a line visible under the Navigation bar. How can I solve it?
I have already tried several solutions on Stack but they have not worked like:
let navigationBar = navigationController?.navigationBar
let navigationBarAppearence = UINavigationBarAppearance()
navigationBarAppearence.shadowColor = .clear
navigationBar?.scrollEdgeAppearance = navigationBarAppearence
With this snippet, even if I change the "clear color" with red color it is visible only in the first controller, in the pushed controller it is always gray.
How can I solve it?
Edit
I've solved with:
if #available(iOS 13.0, *) {
let appearance = UINavigationBarAppearance()
appearance.shadowColor = nil
navigationController?.navigationBar.standardAppearance = appearance
}

Answer 1

import UIKit
public protocol HideableHairlineHelper {
func hideHairline()
func showHairline()
}
extension HideableHairlineHelper where Self: UIViewController {
public func hideHairline() {
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.toolbar.setShadowImage(UIImage(), forToolbarPosition: .any)
}
public func showHairline() {
self.navigationController?.navigationBar.shadowImage = nil
}
}

Answer 2

I've tried the above-suggested ones and failed to remove the navigation separator line. Eventually, I've figured it out that to use TransparentBackground
The trick is to initialize UINavigationBarAppearance with TransparentBackground. Then you could easily remove the horizontal line of the navigation bar.
let appearance = UINavigationBarAppearance()
appearance.configureWithTransparentBackground()
appearance.backgroundColor = UIColor.green // Required background color
Then add the appearance changes to the navigation item as the apple suggested.
self.navigationItem.standardAppearance = appearance
self.navigationItem.scrollEdgeAppearance = appearance
self.navigationItem.compactAppearance = appearance

Answer 3

This is my NavBar template I use on my controllers, there's no line.
navigationController?.setNavigationBarHidden(false, animated: false)
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
navigationController?.navigationBar.shadowImage = UIImage()
navigationController?.navigationBar.isTranslucent = true
let titleAttributes =
[
NSAttributedString.Key.font: UIFont.systemFont(ofSize: 18),
NSAttributedString.Key.foregroundColor: UIColor.red,
]
self.navigationController?.navigationBar.titleTextAttributes = titleAttributes
I obviously change the font size and colour around but that's the basic function I put for each controller to get it clear(translucent).