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native_add/
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├── lib/
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│   └── native_add.dart          # Dart API
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├── src/
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│   └── native_add.c             # C 소스 코드
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├── hook/
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│   └── build.dart               # 빌드 훅
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└── pubspec.yaml

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name: native_add
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description: A native add package using FFI.
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version: 1.0.0
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environment:
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  sdk: ">=3.0.0 <4.0.0"
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  flutter: ">=3.0.0"
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dependencies:
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  ffi: ^2.0.0
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dev_dependencies:
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  ffigen: ^9.0.0
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  native_assets_cli: ^0.5.0
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  native_toolchain_c: ^0.5.0

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import 'dart:io';
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import 'package:flutter/foundation.dart';
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// 플랫폼 확인
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if (Platform.isAndroid) {
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  // Android 전용 로직
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}
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if (Platform.isIOS) {
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  // iOS 전용 로직
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}
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if (Platform.isWindows || Platform.isMacOS || Platform.isLinux) {
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  // 데스크톱 전용 로직
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}
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// 웹 확인 (dart:io 사용 불가)
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if (kIsWeb) {
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  // 웹 전용 로직
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}

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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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class AdaptiveButton extends StatelessWidget {
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  final VoidCallback onPressed;
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  final Widget child;
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  const AdaptiveButton({
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    super.key,
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    required this.onPressed,
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    required this.child,
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  });
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  @override
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  Widget build(BuildContext context) {
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    final platform = Theme.of(context).platform;
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    if (platform == TargetPlatform.iOS ||
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        platform == TargetPlatform.macOS) {
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      return CupertinoButton(
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        onPressed: onPressed,
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        child: child,
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      );
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    }
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    return ElevatedButton(
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      onPressed: onPressed,
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      child: child,
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    );
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  }
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}

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import 'package:flutter/material.dart';
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class AdaptiveScaffold extends StatelessWidget {
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  final Widget body;
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  final String title;
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  const AdaptiveScaffold({
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    super.key,
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    required this.body,
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    required this.title,
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  });
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  @override
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  Widget build(BuildContext context) {
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    final isDesktop = MediaQuery.of(context).size.width > 600;
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    if (isDesktop) {
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      return Scaffold(
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        body: Row(
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          children: [
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            NavigationRail(
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              destinations: const [
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                NavigationRailDestination(
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                  icon: Icon(Icons.home),
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                  label: Text('홈'),
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                ),
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                NavigationRailDestination(
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                  icon: Icon(Icons.settings),
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                  label: Text('설정'),
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                ),
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              ],
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              selectedIndex: 0,
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              onDestinationSelected: (index) {},
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            ),
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            Expanded(child: body),
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          ],
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        ),
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      );
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    }
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    return Scaffold(
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      appBar: AppBar(title: Text(title)),
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      body: body,
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      bottomNavigationBar: NavigationBar(
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        destinations: const [
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          NavigationDestination(
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            icon: Icon(Icons.home),
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            label: '홈',
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          ),
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          NavigationDestination(
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            icon: Icon(Icons.settings),
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            label: '설정',
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          ),
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        ],
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        selectedIndex: 0,
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        onDestinationSelected: (index) {},
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      ),
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    );
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  }
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}