我是否可以在Flutter的一页中创建多个tabBar

Question

我需要使用Flutter设计一个屏幕，并且该屏幕包含两个（TabBar / TabView）和一个TabController当我创建两个它时，它就死了

TabBar(
        controller: _tabController,
        unselectedLabelColor: Colors.black.withOpacity(.2),
        indicatorWeight: 0.1,
        tabs: [
          Tab(
            text: 'INFO',
          ),
          Tab(
            text: 'HISTORY',
          ),
        ],
      ),
      Container(
        width: 21,
        height: 111,
        child: TabBarView(
          controller: _tabController,
          children: [
            Container(
              color: Colors.blue,
            ),
            Container(
              color: Colors.red,
            ),
          ],
        ),
      ),
      SizedBox(height: 12,),
      TabBar(
        controller: _tab2Controller,
        unselectedLabelColor: Colors.black.withOpacity(.2),
        indicatorWeight: 0.1,
        tabs: [
          Tab(
            text: 'INFO',
          ),
          Tab(
            text: 'HISTORY',
          ),
        ],
      ),
      Container(
        width: 21,
        height: 11,
        child: TabBarView(
          controller: _tab2Controller,
          children: [
            Container(
              color: Colors.blue,
            ),
            Container(
              color: Colors.red,
            ),
          ],
        ),
      ),

Answer 1

在TabBarView中，使嵌套的Tabbar成为独立的小部件在下面的演示中，选项卡2具有嵌套的tarbar，TestTab是独立的小部件代码段

body: TabBarView(
          controller: _tabController,
          children: <Widget>[
            ListView.builder(
                key: PageStorageKey('one'),
                itemBuilder: (BuildContext context, int index) {
                  return ListTile(title: Text('One $index'),);
                }
            ),
            TestTab()
          ]

完整代码

import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(title: 'Test', home: TestApp()));

class TestApp extends StatefulWidget {
  @override
  _TestAppState createState() => _TestAppState();
}

class _TestAppState extends State<TestApp>
    with SingleTickerProviderStateMixin {

  TabController _tabController;

  void handleTabChange() {
    print('Outer tab index: ${_tabController.index}');
  }

  @override
  void initState() {
    super.initState();
    _tabController = TabController(
        length: 2,
        vsync: this
    );
    _tabController.addListener(handleTabChange);
  }

  @override
  void dispose() {
    _tabController.removeListener(handleTabChange);
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    print('build main');
    return Scaffold(
        appBar: AppBar(
          title: Text('Test'),
          bottom: TabBar(
            controller: _tabController,
            tabs: <Widget>[
              Tab(text: 'One'),
              Tab(text: 'Two')
            ],
          ),
        ),
        body: TabBarView(
          controller: _tabController,
          children: <Widget>[
            ListView.builder(
                key: PageStorageKey('one'),
                itemBuilder: (BuildContext context, int index) {
                  return ListTile(title: Text('One $index'),);
                }
            ),
            TestTab()
          ],
        )
    );
  }
}

class TestTab extends StatefulWidget{
  @override
  _TestTabState createState() => _TestTabState();
}

class _TestTabState extends State<TestTab>
    with SingleTickerProviderStateMixin {

  final _tabKey = ValueKey('tab');

  TabController _innerTabController;

  void handleTabChange() {
    print('Inner tab, previous: ${_innerTabController.previousIndex}, current: ${_innerTabController.index}');
    PageStorage.of(context).writeState(context, _innerTabController.index, identifier: _tabKey);
  }

  @override
  void initState() {
    super.initState();
    print('init');
    int initialIndex = PageStorage.of(context).readState(context, identifier: _tabKey);
    _innerTabController = TabController(
        length: 2,
        vsync: this,
        initialIndex: initialIndex != null ? initialIndex : 0
    );
    _innerTabController.addListener(handleTabChange);
  }

  @override
  void dispose() {
    _innerTabController.removeListener(handleTabChange);
    _innerTabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    print('build');
    return Scaffold(
      appBar: AppBar(
        bottom: TabBar(
          controller: _innerTabController,
          tabs: <Widget>[
            Tab(child: Text('1'),),
            Tab(child: Text('2'),),
          ],
        ),
      ),
      body: TabBarView(
        controller: _innerTabController,
        children: <Widget>[
          ListView.builder(
              key: PageStorageKey('1'),
              itemBuilder: (BuildContext context, int index) {
                return ListTile(title: Text('child1 $index'));
              }
          ),
          ListView.builder(
              key: PageStorageKey('2'),
              itemBuilder: (BuildContext context, int index) {
                return ListTile(title: Text('child2 $index'));
              }
          )
        ],
      ),
    );
  }
}