Cupertino Tab Page

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:promociones/pages/login_signup_page.dart';
import './home_page.dart';
import 'package:promociones/services/authentication.dart';
import './nearme.dart';
import './notification.dart';
import './wallet.dart';
import '../modals/MyRewards.dart';
import './map_page.dart';
import './my_profile.dart';

class TabBarPage extends StatefulWidget {
  TabBarPage({Key key, this.auth, this.userId, this.onSignedOut})
      : super(key: key);

  final BaseAuth auth;
  final VoidCallback onSignedOut;
  final String userId;

    @override
  _TabBarPage createState() => new _TabBarPage();
}
 

class _TabBarPage extends State<TabBarPage> {
  _TabBarPage({Key key, this.auth, this.userId, this.onSignedOut});
  final BaseAuth auth;
  final VoidCallback onSignedOut;
  final String userId;

  void _onTap(int value) {
    print('Value => $value');
  }


  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return CupertinoTabScaffold(
      tabBar: CupertinoTabBar(
        onTap: _onTap,
        activeColor: new Color.fromRGBO(148, 3, 123,1.0),
        items: <BottomNavigationBarItem> [
         new BottomNavigationBarItem(
             title: new Text('Home'),
             icon: new Icon(
                 Icons.home,
                 size: 22,
             ),
         ),
         new BottomNavigationBarItem(
             title: new Text('Near me'),
             icon: new Icon(
                 Icons.location_on,
                 size: 22,
             ),
         ),
         new BottomNavigationBarItem(
             icon: new Icon(
               Icons.map,
               size: 22,
             ),
              title: new Text('Map')
         ),
         new BottomNavigationBarItem(
             title: new Text('Notifications'),
             icon: new Icon(
                 Icons.notifications,
                  size: 22,
             )
         ),
         new BottomNavigationBarItem(
             title: new Text('Wallet'),
             icon: new Icon(
                 Icons.account_balance_wallet,
                  size: 22,
             )
         ),
        ],
      ),
      tabBuilder: (BuildContext context, int index) {
       switch(index) {
         case 0:
           print(this.auth);
           return CupertinoTabView(
             builder: (BuildContext context) {
               return HomePage();
             },
           );
           break;
         case 1:
           return CupertinoTabView(
             builder: (BuildContext context) {
               return NearMe();
             },
           );
           break;
         case 2:
           return CupertinoTabView(
             builder: (BuildContext context) {
               return MapPage();
             },
           );
           break;
         case 3:
           return CupertinoTabView(
             builder: (BuildContext context) {
               return Notifications();
             },
           );
           break;
         case 4:
           return CupertinoTabView(
             builder: (BuildContext context) {
               return Wallet();
             },
             routes: {
               "/myRewards": (BuildContext context) => new MyRewards(),
               "/myProfile": (BuildContext context) => new MyProfile(),
             },
           );
           break;
       }
      },
    );
  }