Flutter-tabbar切換

import ‘package:flutter/material.dart‘;
import ‘index_attendance_record.dart‘;
import ‘index_diet.dart‘;

class IndexScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    TabController _tabController;
    return new DefaultTabController(
      length: 4,
      child: Scaffold(
        appBar: AppBar(
          bottom: TabBar(
            tabs: <Widget>[
              Tab(icon: Icon(Icons.event_note),text: ‘出勤紀錄‘,),
              Tab(icon: Icon(Icons.local_dining),text: ‘膳食‘,),
              Tab(icon: Icon(Icons.face),text: ‘成長紀錄‘,),
              Tab(icon: Icon(Icons.description),text: ‘訂單紀錄‘,),
            ],
            controller: _tabController,
          ),
        ),
        body: TabBarView(
          children: <Widget>[
            Center(child: AttendanceRecordScreen(),),
            Center(child: IndexDietScreen()),
            Center(child: Text(‘巴士‘)),
            Center(child: Text(‘巴士123123‘)),
          ],
        ),
      ),
    );
  }
}