Flutter -如何从嵌套脚手架访问抽屉

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Nested Scaffold'),
        ),
        body: NestedScrollView(
          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
            return <Widget>[
              SliverAppBar(
                expandedHeight: 200,
                flexibleSpace: FlexibleSpaceBar(
                  background: Container(
                    decoration: BoxDecoration(
                      image: DecorationImage(
                        image: AssetImage('assets/background.jpg'),
                        fit: BoxFit.cover,
                      ),
                    ),
                  ),
                ),
              ),
            ];
          },
          body: ListView.builder(
            itemCount: 10,
            itemBuilder: (BuildContext context, int index) {
              return ListTile(
                title: Text('Item $index'),
              );
            },
          ),
        ),
        endDrawer: Drawer(
          child: ListView(
            children: <Widget>[
              ListTile(
                title: Text('Menu Item 1'),
              ),
              ListTile(
                title: Text('Menu Item 2'),
              ),
              ListTile(
                title: Text('Menu Item 3'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}