TabBarView和BottomNavigationBar来控制在Scaffold主体上显示的内容 [英] TabBarView and BottomNavigationBar to control what displays at body of Scaffold

问题描述

我不能同时使用 TabBarView 和 BottomNavigationBar 来控制脚手架主体上显示的内容.使用此代码，TabBarView可以控制或BottomNavigationBar.

I can't have both TabBarView and BottomNavigationBar control what displays at the body of my Scaffold. With this code, either TabBarView has control or BottomNavigationBar.

我希望能够在所有四个页面之间横向滚动，并选择首页"和收藏夹"来控制屏幕上显示的内容.

I want to be able to scroll sideways between ALL FOUR pages as well as pick HOME and FAVORITES to control what displays on the screen.

@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 Stack(
      children: <Widget>[
        new Offstage(
          offstage: index != 0,
          child: new TickerMode(
            enabled: index == 0,
            child: new Material(child: new NewPage()),
          ),
        ),
        new Offstage(
          offstage: index != 1,
          child: new TickerMode(
            enabled: index == 1,
            child: new Material(child: new HotelsPage()),
          ),
        ),
        new TabBarView(controller: controller, children: <Widget>[
          new NewPage(),
          new HotelsPage(),
          new FoodPage(),
          new FunPage(),
        ]),
      ],
    ),
    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"),
          ),
        ]),
  );
}

推荐答案

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Offstages，您还可以创建所需类的新实例.

I tweaked your code a little to achieve what I think you were asking for.
You can switch between the for tabs by just clicking on the tabs or by swiping left or right. Instead of using Offstages you can just create a new instance of the required class.

这是一个正在运行的示例，希望对您有所帮助:

Here is a running example, I hope it helps:

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，请随时询问.

If you have any questions to this, please don't hesitate to ask.

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