TabBarView和BottomNavigationBar来控制在Scaffold主体上显示的内容

我对您的代码进行了一些调整，以实现我认为您要的功能。
您可以通过单击选项卡或向左或向右滑动来在for选项卡之间切换。除了使用之外，

Offstages

这是一个正在运行的示例，希望对您有所帮助：

import 'package:flutter/material.dart';void main() {  runApp(new MyApp());}class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return new MaterialApp(      home: new MyHomePage(),    );  }}class MyHomePage extends StatefulWidget {  @override  State createState() => new MyHomePageState();}class MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {  TabController _controller;  int _index;  @override  void initState() {    super.initState();    _controller = new TabController(length: 4, vsync: this);    _index = 0;  }  @override  Widget build(BuildContext context) {    return new Scaffold(      appBar: new AppBar(        title: new Text("Traveler"),        bottom: new TabBar(controller: _controller, tabs: <Tab>[          new Tab(text: "NEW"),          new Tab(text: "HOTELS"),          new Tab(text: "FOOD"),          new Tab(text: "FUN"),        ]),      ),      body: new TabBarView(        controller: _controller,        children: <Widget>[          new NewPage(_index),          new HotelsPage(_index),          new FoodPage(_index),          new FunPage(_index),        ],      ),      bottomNavigationBar: new BottomNavigationBar(          currentIndex: _index,          onTap: (int _index) { setState(() {   this._index = _index; });          },          items: <BottomNavigationBarItem>[ new BottomNavigationBarItem(   icon: new Icon(Icons.home),   title: new Text("Home"), ), new BottomNavigationBarItem(   icon: new Icon(Icons.favorite),   title: new Text("Favorites"), ),          ]),    );  }}class NewPage extends StatelessWidget {  final int index;  NewPage(this.index);  @override  Widget build(BuildContext context) {    return new Center(      child: new Text('NewPage, index: $index'),    );  }}class HotelsPage extends StatelessWidget {  final int index;  HotelsPage(this.index);  @override  Widget build(BuildContext context) {    return new Center(      child: new Text('HotelsPage, index: $index'),    );  }}class FoodPage extends StatelessWidget {  final int index;  FoodPage(this.index);  @override  Widget build(BuildContext context) {    return new Center(      child: new Text('FoodPage, index: $index'),    );  }}class FunPage extends StatelessWidget {  final int index;  FunPage(this.index);  @override  Widget build(BuildContext context) {    return new Center(      child: new Text('FunPage, index: $index'),    );  }}

如果对此有任何疑问，请不要犹豫。