Hiding back button in navigation bar in iOS

import UIKit

class NavigationController: UINavigationController {
  override func viewDidLoad() {
    super.viewDidLoad()
    navigationBar.tintColor = .white
    navigationBar.barStyle = .black
    navigationBar.isTranslucent = false
  }
  
  override func pushViewController(_ viewController: UIViewController, animated: Bool) {
    viewController.navigationItem.backBarButtonItem =
      UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
    super.pushViewController(viewController, animated: animated)
  }
}