Flutter -Adding a popup menu button to the BottomNavigationBar中的图标

import 'package:flutter/material.dart';

BottomNavigationBarItem(
  icon: Icon(Icons.home),
  label: 'Home',
),

BottomNavigationBarItem(
  icon: PopupMenuButton(
    itemBuilder: (BuildContext context) {
      return [
        PopupMenuItem(
          child: Text('Option 1'),
        ),
        PopupMenuItem(
          child: Text('Option 2'),
        ),
        PopupMenuItem(
          child: Text('Option 3'),
        ),
      ];
    },
    child: Icon(Icons.more_vert),
  ),
  label: 'More',
),

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('Flutter Popup Menu Button'),
        ),
        body: Center(
          child: Text('Hello, Flutter!'),
        ),
        bottomNavigationBar: BottomNavigationBar(
          items: [
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              label: 'Home',
            ),
            BottomNavigationBarItem(
              icon: PopupMenuButton(
                itemBuilder: (BuildContext context) {
                  return [
                    PopupMenuItem(
                      child: Text('Option 1'),
                    ),
                    PopupMenuItem(
                      child: Text('Option 2'),
                    ),
                    PopupMenuItem(
                      child: Text('Option 3'),
                    ),
                  ];
                },
                child: Icon(Icons.more_vert),
              ),
              label: 'More',
            ),
          ],
        ),
      ),
    );
  }
}