如何显示导航栏并仅在 Flutter 中的特定页面上显示

Question

我正在开发一个应用程序。应用具有初始屏幕，然后显示游览屏幕(如果这是用户首次运行应用(。最后，一旦用户退出游览屏幕，他们就会被定向到主应用程序页面。主页应显示导航栏(但不显示初始屏幕或游览屏幕(。

我有下面的所有代码：

1. 如何显示导航栏？

2. 如何限制哪些页面可以显示它？

谢谢

主飞镖

import 'package:flutter/material.dart';
import 'package:fyw/pages/navigation_bar.dart';
import 'package:fyw/pages/tour.dart';
import 'package:fyw/pages/splash.dart';
import 'package:fyw/pages/login.dart';
import 'package:fyw/pages/home.dart';
var routes = <String, WidgetBuilder>{
  "/tourpage": (BuildContext context) => Tour(),
  "/loginpage": (BuildContext context) => LoginPage(),
  "/homepage": (BuildContext context) => HomePage(),
};
void main() => runApp(new MaterialApp(
    theme:
        ThemeData(primaryColor: Colors.red, accentColor: Colors.yellowAccent),
    debugShowCheckedModeBanner: false,
    home: Splash(),
    routes: routes
    ));

navigation_bar.飞镖

import 'package:flutter/material.dart';
import 'package:fyw/pages/home.dart';
import 'package:fyw/pages/login.dart';

class NavigationBarController extends StatefulWidget {
  @override
  _NavigationBarControllerState createState() =>
      _NavigationBarControllerState();
}
class _NavigationBarControllerState
    extends State<NavigationBarController> {
  final List<Widget> pages = [
    HomePage(),
    LoginPage(),
  ];
  final PageStorageBucket bucket = PageStorageBucket();
  int _selectedIndex = 0;
  Widget _bottomNavigationBar(int selectedIndex) => BottomNavigationBar(
        onTap: (int index) => setState(() => _selectedIndex = index),
        currentIndex: selectedIndex,
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
              icon: Icon(Icons.add), title: Text('home')),
          BottomNavigationBarItem(
              icon: Icon(Icons.list), title: Text('login Page')),
        ],
      );
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      bottomNavigationBar: _bottomNavigationBar(_selectedIndex),
      body: PageStorage(
        child: pages[_selectedIndex],
        bucket: bucket,
      ),
    );
  }
}

Answer 1

  class Home extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        bottomNavigationBar: NavigationBarController(context),
       );
    }
  }