AppDelegate.swift

extension UIApplication {
    var statusBarView: UIView? {
        return value(forKey: "statusBar") as? UIView
    }
}

FadeNavigationBar.swift

func scrollViewDidScroll(_ scrollView: UIScrollView) {
  guard let height = navigationController?.navigationBar.frame.height else { return }
    var offset = scrollView.contentOffset.y / height
    if offset > 1 {
      offset = 1
      let color = Color.pinky_red.withAlphaComponent(offset)
      navigationController?.navigationBar.backgroundColor = color
      UIApplication.shared.statusBarView?.backgroundColor = color
    } else {
      let color = Color.pinky_red.withAlphaComponent(offset)
      navigationController?.navigationBar.backgroundColor = color
      UIApplication.shared.statusBarView?.backgroundColor = color
    }
}