在flutter自定义应用程序栏中未获取脚手架上下文

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: Builder(
          builder: (BuildContext context) {
            return AppBar(
              title: Text('Custom AppBar'),
              actions: [
                IconButton(
                  icon: Icon(Icons.settings),
                  onPressed: () {
                    // 在这里可以使用脚手架上下文进行操作
                    Scaffold.of(context).openEndDrawer();
                  },
                ),
              ],
            );
          },
        ),
        body: Center(
          child: Text('Hello World'),
        ),
      ),
    );
  }
}