nav controller

class HomeFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? = inflater.inflate(R.layout.fragment_home, container, false)

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        val navController = Navigation.findNavController(activity!!, R.id.home_navigation_fragment)


        bottomNavigationView.onItemClicked(0){ navController.navigate(R.id.action_global_feed) }
        bottomNavigationView.onItemClicked(1){ navController.navigate(R.id.action_global_orders)}

        navController.addOnDestinationChangedListener { _, destination, _ ->
            toolbar.title = destination.label
        }
    }

    fun BottomNavigationView.onItemClicked(index: Int, action: (MenuItem) -> Unit) = menu[index]
        .setOnMenuItemClickListener { it.isChecked = true;action(it);true }
}