如何使用tabBar实现sliverAppBar

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: MyHomePage(),
      ),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final List<String> _tabs = ['Tab 1', 'Tab 2', 'Tab 3'];

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: _tabs.length,
      child: CustomScrollView(
        slivers: [
          SliverAppBar(
            expandedHeight: 200.0,
            pinned: true,
            flexibleSpace: FlexibleSpaceBar(
              title: Text('My App'),
              background: Image.asset('assets/image.jpg', fit: BoxFit.cover),
            ),
            bottom: TabBar(
              tabs: _tabs.map((tab) => Tab(text: tab)).toList(),
            ),
          ),
          SliverList(
            delegate: SliverChildBuilderDelegate(
              (context, index) {
                return ListTile(title: Text('Item $index'));
              },
              childCount: 100,
            ),
          ),
        ],
      ),
    );
  }
}