在Flutter应用内部实现分屏功能

前言

这一次被要求实现屏幕上同时展示两个页面，并且两个页面的逻辑，功能互不影响，通俗一点讲就是在Flutter内部实现一个类似于分屏的功能，这可难不倒我。

方法

要在 Flutter 中实现一个屏幕的上半部分和下半部分展示不同的页面（我这里是左右两部分），并且两个页面的逻辑互不影响，可以使用 Row 和 Expanded 组件来划分屏幕的左右部分，并分别在这两个部分中使用 Navigator 进行页面导航。还可以依赖 Navigator 在任一页面中对另一个页面的路由进行控制。

效果如下：

代码

import 'package:date_format/date_format.dart';
import 'package:flutter/material.dart';void main() {runApp(MyApp());
}class MyApp extends StatelessWidget {final GlobalKey<NavigatorState> topNavigatorKey = GlobalKey<NavigatorState>();final GlobalKey<NavigatorState> bottomNavigatorKey =GlobalKey<NavigatorState>();@overrideWidget build(BuildContext context) {return MaterialApp(home: Scaffold(body: Row(children: [Expanded(child: Navigator(key: topNavigatorKey,onGenerateRoute: (settings) {return MaterialPageRoute(settings: settings,builder: (_) => TopPage(bottomNavigatorKey: bottomNavigatorKey,),);},),),Expanded(child: Navigator(key: bottomNavigatorKey,onGenerateRoute: (settings) {return MaterialPageRoute(settings: settings,builder: (_) =>BottomPage(), // Placeholder, BottomPage can be added here);},),),],),),);}
}class TopPage extends StatelessWidget {final GlobalKey<NavigatorState> bottomNavigatorKey;TopPage({required this.bottomNavigatorKey});@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('Top Page')),body: Padding(padding: const EdgeInsets.all(8.0),child: Column(children: [Center(child: ElevatedButton(child: Text('Go to Top Details'),onPressed: () {Navigator.of(context).push(MaterialPageRoute(builder: (_) => TopDetailsPage()),);},),),SizedBox(height: 20),Center(child: ElevatedButton(child: Text('Show Bottom Page Details'),onPressed: () {// changeBottomPageState();bottomNavigatorKey.currentState!.push(MaterialPageRoute(builder: (_) => BottomDetailsPage()),);},),),]),),);}
}class TopDetailsPage extends StatelessWidget {@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('Top Details Page')),body: Center(child: ElevatedButton(child: Text('Go to Bottom Page'), // Add a button to navigate to BottomPageonPressed: () {Navigator.of(context).push(MaterialPageRoute(builder: (_) => BottomPage()),);},),),);}
}class BottomPage extends StatelessWidget {@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('Bottom Page')),body: Center(child: ElevatedButton(child: Text('Go to Bottom Details'),onPressed: () {Navigator.of(context).push(MaterialPageRoute(builder: (_) => BottomDetailsPage()),);},),),);}
}class BottomDetailsPage extends StatelessWidget {@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text('Bottom Details Page')),body: Center(child: Text('This is the Bottom Details Page'),),);}
}

总结

以上就是本期内容啦，如果你有其他的实现方法，欢迎留言一起讨论交流哦。