Flutter顶部导航栏一_flutter uisegment

import 'package:flutter/material.dart';
class TabBarControllerPage extends StatefulWidget {
  @override
  _TabBarControllerPageState createState() => _TabBarControllerPageState();
}

class _TabBarControllerPageState extends State<TabBarControllerPage> with SingleTickerProviderStateMixin {
  TabController _tabController;
  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    _tabController.dispose();
  }
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _tabController = new TabController(length: 2, vsync: this);
    _tabController.addListener((){
      print(_tabController.index);
    });
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('TabBarControllerPage'),
        bottom: TabBar(
          controller: this._tabController,
          tabs: <Widget>[
            Tab(text: '热销',),
            Tab(text: '推荐',),
          ],
        ),
      ),
      body: TabBarView(
        controller: this._tabController,
        children: <Widget>[
          Center(
          child:Text('11'),
      ),
        Center(
          child: Text('22'),
        )
        ],
      ),
    );
  }
}

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