Flutter 跨平台开发：iOS+Android 统一界面实战-编程实验室

以下是一个Flutter跨平台开发的实战代码示例，实现iOS和Android平台的统一界面，包含常见功能模块：

基础页面结构

import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: '跨平台Demo', theme: ThemeData( primarySwatch: Colors.blue, platform: TargetPlatform.android, // 统一风格 ), home: HomePage(), ); } }

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统一界面组件

class HomePage extends StatefulWidget { @override _HomePageState createState() => _HomePageState(); } class _HomePageState extends State<HomePage> { int _counter = 0; final TextEditingController _controller = TextEditingController(); void _incrementCounter() { setState(() { _counter++; }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('统一界面'), actions: [ IconButton( icon: Icon(Icons.settings), onPressed: () { Navigator.push( context, MaterialPageRoute(builder: (context) => SettingsPage()), ); }, ), ], ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ TextField( controller: _controller, decoration: InputDecoration( labelText: '输入内容', border: OutlineInputBorder(), ), ), SizedBox(height: 20), Text( '点击次数: $_counter', style: Theme.of(context).textTheme.headline6, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, child: Icon(Icons.add), ), ); } }

平台适配对话框

class SettingsPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('设置'), ), body: ListView( children: [ ListTile( title: Text('主题设置'), onTap: () => _showThemeDialog(context), ), ListTile( title: Text('关于'), onTap: () => _showAboutDialog(context), ), ], ), ); } void _showThemeDialog(BuildContext context) { showDialog( context: context, builder: (BuildContext context) { return AlertDialog( title: Text('选择主题'), content: SingleChildScrollView( child: Column( children: [ _buildThemeOption(context, '浅色', ThemeMode.light), _buildThemeOption(context, '深色', ThemeMode.dark), _buildThemeOption(context, '系统默认', ThemeMode.system), ], ), ), ); }, ); } Widget _buildThemeOption( BuildContext context, String text, ThemeMode mode) { return ListTile( title: Text(text), onTap: () { // 实现主题切换逻辑 Navigator.pop(context); }, ); } void _showAboutDialog(BuildContext context) { showAboutDialog( context: context, applicationName: '统一界面Demo', applicationVersion: '1.0.0', ); } }

平台特定适配

// 在需要区分平台的地方使用以下判断 if (Theme.of(context).platform == TargetPlatform.iOS) { // iOS特定样式或行为 } else if (Theme.of(context).platform == TargetPlatform.android) { // Android特定样式或行为 }