main.dart

import 'package:flutter/material.dart';
import 'package:get/get.dart';

void main() {
  runApp(
    GetMaterialApp(
      debugShowCheckedModeBanner: false,
      initialRoute: '/',
      themeMode: ThemeMode.system,
      darkTheme: ThemeData.dark(),
      theme: ThemeData.dark(),
      defaultTransition: Transition.fade,
      initialBinding: BindingsBuilder.put(() => HomeController()),
      home: Home(),
    ),
  );
}

class HomeController extends GetxController {
  final index = 0.obs;
  int get currentIndex => index.value;
  @override
  void onInit() {
    ever(index, (int val) {
      Get.toNamed('${val + 1}', id: 1);
    });
    super.onInit();
  }
}

class Home extends GetWidget<HomeController> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Navigator(
          initialRoute: '1',
          key: Get.nestedKey(1),
          onGenerateRoute: (settings) {
            switch (settings.name) {
              case '1':
                return GetPageRoute(
                  page: () => Center(child: Text('1')),
                );
                break;
              case '2':
                return GetPageRoute(
                  page: () => Center(child: Text('2')),
                );
                break;
              default:
                return GetPageRoute(
                  page: () => Center(child: Text('Error')),
                );
            }
          },
        ),
      ),
      bottomNavigationBar: Obx(
        () => BottomNavigationBar(
          currentIndex: controller.currentIndex,
          onTap: controller.index,
          selectedItemColor: Colors.amber,
          items: [
            BottomNavigationBarItem(
              icon: Icon(Icons.access_alarm),
              label: 'Hello',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.access_alarm),
              label: 'Hello',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.access_alarm),
              label: 'Hello',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.access_alarm),
              label: 'Hello',
            ),
          ],
        ),
      ),
    );
  }
}