[TOC] ## 概述 可以根據運行時平臺（Android 或 iOS）使用不同的主題架構。Flutter 提供了平臺檢測的方法，通過這些方法可以根據平臺使用不同的主題 ## 示例 ``` import 'package:flutter/material.dart'; import 'package:flutter/cupertino.dart'; import 'dart:io'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, visualDensity: VisualDensity.adaptivePlatformDensity, cupertinoOverrideTheme: CupertinoThemeData( primaryColor: Colors.orange, ), ), home: MyHomePage(), ); } } class MyHomePage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Platform Specific Theme'), ), body: Center( child: Text('Hello World'), ), ); } } ```