FLUTTER动态渲染 顶部tabbar

import 'package:flutter/material.dart';
//class From extends StatelessWidget {
//  @override
//  Widget build(BuildContext context) {
//    return Scaffold(
//      body: Text('322333'),
//    );
//  }
//}
class From extends StatefulWidget {
    From({Key key}) :super(key:key);

  @override
  _FromState createState() => _FromState();
}

class _FromState extends State<From> with SingleTickerProviderStateMixin {
  TabController _tabController;

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('21212'),
        bottom: TabBar(
          controller: this._tabController,
          tabs: <Widget>[
            Tab(text: '23233',),
            Tab(text: '23233',)
          ],
        ),
      ),
      body: TabBarView(
        controller: this._tabController,
        children: <Widget>[
          Center(
            child: Text('WEQREWQER'),
          ),
          Center(
            child: Text('WEQREWQER'),
          ),
        ],
      ),
    );
  }
}