Navigating backwards when implementing the CustomNavigator

RandomViewsFragment.kt

class RandomViewsFragment : Fragment() {

  private val customNavigator = CustomNavigator()
  
  /**
   * Intercept onBackPressed
   */
  private val onBackPressedCallback : OnBackPressedCallback = object : OnBackPressedCallback(true){
      override fun handleOnBackPressed() {
          back()
      }
  }
  
  /**
  * Register onBackPressedCallback 
  */
 override fun onCreate(savedInstanceState: Bundle?) {
       super.onCreate(savedInstanceState)
       requireActivity().onBackPressedDispatcher.addCallback(this, onBackPressedCallback)
   }
  
  /**
     * Navigate backwards
     *
     * Hand navigation control back to the NavController when there
     * are no more custom views
     */
    private fun back() {
        val success = customNavigator.back();
        if (!success){
            findNavController().popBackStack()
        }
    }
}