flutter - 如何在flutter中的另一个tabview中制作tabview？

Question

我尝试通过以下方式创建嵌套的选项卡栏 View ，方法是从外部选项卡 View 返回包含另一个选项卡 View 的列，但是它只显示一个空白屏幕而不是第二个选项卡 View 。我怎样才能解决这个问题？

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home: DefaultTabController(length: 2, child: MyHomePage(title: '')),
    );
  }
}


class MyHomePage extends StatelessWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;



 @override
  Widget build(BuildContext context){



   final view = LayoutBuilder(builder: (context, constraints){
       //created a widget here with content 
   });


   return Scaffold(

     appBar: AppBar(
       title: Text('Tab bar view'), bottom: TabBar(
         tabs: [
           Tab(icon: Icon(Icons.directions_car)),
           Tab(icon: Icon(Icons.directions_transit)),
         ]),
     ),

     body:  TabBarView(children: [DefaultTabController(length: 2, child: Column(
         children: <Widget>[TabBar(tabs: [Tab(text: 'Home'),Tab(text: 'News')
           , Container(child: TabBarView(

             children: <Widget>[ view, Icon(Icons.access_alarms)],
           ))])]
     ) ), Icon(Icons.directions_car)]));
 }

}

Answer 1

就像在 Google Play 商店中那样做的最佳方式。

import 'package:flutter/material.dart';

class Locationstat extends StatefulWidget {
  @override
  _LocationstatState createState() => _LocationstatState();
}

class _LocationstatState extends State<Locationstat>
    with SingleTickerProviderStateMixin {
    TabController _tabController;
  @override
  void initState() {
    super.initState();
    _tabController = new TabController(length: 2, vsync: this);
  }
  @override
  void dispose() {
    super.dispose();
    _tabController.dispose();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        elevation: 0,
        title: Text('Statistics'),

      bottom: TabBar(
            controller: _tabController,
            indicatorColor: Colors.orange,
            labelColor: Colors.orange,
            unselectedLabelColor: Colors.black54,
            tabs: <Widget>[
              Tab(
               text:('Pokhara Lekhnath'),
              ),
              Tab(
                 text:('Outside Pokhara-Lekhnath'),
              ),
            ]),
      ),
      body: TabBarView(
        children: <Widget>[
          NestedTabBar(),
          NestedTabBar(),

        ],
        controller: _tabController,
      ),
    );
  }
}




class NestedTabBar extends StatefulWidget {
  @override
  _NestedTabBarState createState() => _NestedTabBarState();
}
class _NestedTabBarState extends State<NestedTabBar>
    with TickerProviderStateMixin {
  TabController _nestedTabController;
  @override
  void initState() {
    super.initState();
    _nestedTabController = new TabController(length: 2, vsync: this);
  }
  @override
  void dispose() {
    super.dispose();
    _nestedTabController.dispose();
  }
  @override
  Widget build(BuildContext context) {
    double screenHeight = MediaQuery.of(context).size.height;
    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: <Widget>[
        TabBar(
          controller: _nestedTabController,
          indicatorColor: Colors.orange,
          labelColor: Colors.orange,
          unselectedLabelColor: Colors.black54,
          isScrollable: true,
          tabs: <Widget>[
            Tab(
              text: "Inside Pokhara",
            ),
            Tab(
              text: "Outside Pokhara",
            ),

          ],
        ),
        Container(
          height: screenHeight * 0.70,
          margin: EdgeInsets.only(left: 16.0, right: 16.0),
          child: TabBarView(
            controller: _nestedTabController,
            children: <Widget>[
              Container(
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(8.0),
                  color: Colors.blueGrey[300],
                ),
              ),
              Container(
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(8.0),
                  color: Colors.blueGrey[300],
                ),
              ),

            ],
          ),
        )
      ],
    );
  }
}