Flutter自定义顶部导航栏

自定义顶部导航栏：

import 'package:flutter/material.dart';
import './tabs.dart';
class MePage extends StatelessWidget {
    MePage({this.arguments});
    final arguments;
    @override
    Widget build(BuildContext context) {
        return Scaffold(
            appBar: AppBar(
                // 左侧的图标 IconButton 是可以设置点击事件的按钮
                leading: IconButton(
                    icon: Icon(Icons.menu),
                    onPressed: () {
                        print('menu');
                    },
                ),
                title: Text('我的'),
                // 这个是配置 右侧的图标
                actions: [
                    IconButton(
                        icon: Icon(Icons.search),
                        onPressed: () {
                            print('search');
                        }),
                    IconButton(
                        icon: Icon(Icons.settings),
                        onPressed: () {
                            print('settings');
                        }),
                ],
            ),
            body: Center(
                child: Column(
                    children: [
                        Text("我的${arguments != null ? arguments['id'] : '默认参数'}"),
                        ElevatedButton(
                            onPressed: () {
                                Navigator.pushAndRemoveUntil(
                                    context,
                                    MaterialPageRoute(
                                        builder: (context) =>
                                        MyBottomNavigationBar(index: 1)),
                                    (route) => route == null);
                            },
                            child: Text('回到根目录下'))
                    ],
                ),
            ),
        );
    }
}