Flutter 튜토리얼 69편: 기존 iOS 앱에 Flutter 추가

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import SwiftUI
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import Flutter
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import FlutterPluginRegistrant
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@Observable
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class FlutterDependencies {
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    let flutterEngine = FlutterEngine(name: "my flutter engine")
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    init() {
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        // 기본 Dart 엔트리포인트(main()) 실행
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        flutterEngine.run()
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        // 플러그인 등록
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        GeneratedPluginRegistrant.register(with: self.flutterEngine)
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    }
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}
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@main
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struct MyApp: App {
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    @State var flutterDependencies = FlutterDependencies()
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    var body: some Scene {
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        WindowGroup {
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            ContentView()
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                .environment(flutterDependencies)
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        }
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    }
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}

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import UIKit
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import Flutter
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import FlutterPluginRegistrant
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@main
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class AppDelegate: FlutterAppDelegate {
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    lazy var flutterEngine = FlutterEngine(name: "my flutter engine")
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    override func application(
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        _ application: UIApplication,
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        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
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    ) -> Bool {
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        // Flutter 엔진 시작
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        flutterEngine.run()
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        // 플러그인 등록
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        GeneratedPluginRegistrant.register(with: self.flutterEngine)
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        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
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    }
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}

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import SwiftUI
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import Flutter
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struct FlutterViewControllerRepresentable: UIViewControllerRepresentable {
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    @Environment(FlutterDependencies.self) var flutterDependencies
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    func makeUIViewController(context: Context) -> some UIViewController {
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        return FlutterViewController(
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            engine: flutterDependencies.flutterEngine,
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            nibName: nil,
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            bundle: nil
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        )
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    }
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    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {}
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}
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struct ContentView: View {
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    var body: some View {
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        NavigationStack {
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            VStack {
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                Text("기존 iOS 앱")
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                NavigationLink("Flutter 화면 열기") {
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                    FlutterViewControllerRepresentable()
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                        .ignoresSafeArea()
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                }
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            }
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        }
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    }
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}

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import UIKit
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import Flutter
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class ViewController: UIViewController {
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    @IBAction func showFlutter(_ sender: Any) {
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        guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
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            return
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        }
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        let flutterViewController = FlutterViewController(
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            engine: appDelegate.flutterEngine,
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            nibName: nil,
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            bundle: nil
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        )
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        // 모달로 표시
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        present(flutterViewController, animated: true, completion: nil)
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        // 또는 네비게이션 푸시
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        // navigationController?.pushViewController(flutterViewController, animated: true)
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    }
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}

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// 다른 진입점은 반드시 @pragma 어노테이션이 필요합니다
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// 이 어노테이션이 없으면 트리 쉐이킹으로 제거될 수 있습니다
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@pragma('vm:entry-point')
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void myOtherEntrypoint() {
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  runApp(const MyOtherApp());
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}

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import 'package:flutter/services.dart';
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class PlatformChannel {
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  static const platform = MethodChannel('com.example.myapp/channel');
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  // iOS 메서드 호출
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  static Future<int> getBatteryLevel() async {
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    try {
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      final int result = await platform.invokeMethod('getBatteryLevel');
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      return result;
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    } on PlatformException catch (e) {
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      print('Failed to get battery level: ${e.message}');
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      return -1;
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    }
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  }
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  // iOS에 Alert 표시 요청
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  static Future<void> showNativeAlert(String message) async {
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    try {
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      await platform.invokeMethod('showNativeAlert', message);
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    } on PlatformException catch (e) {
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      print('Failed to show alert: ${e.message}');
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    }
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  }
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  // iOS에서 오는 메서드 호출 수신
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  static void setupMethodCallHandler() {
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    platform.setMethodCallHandler((call) async {
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      switch (call.method) {
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        case 'receiveData':
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          final data = call.arguments as Map<dynamic, dynamic>;
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          print('Received data from iOS: $data');
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          return 'Data received successfully';
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        default:
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          throw MissingPluginException('Not implemented: ${call.method}');
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      }
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    });
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  }
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}