I’m encountering an error when trying to build my Flutter iOS app for the simulator. The build fails with the following error message:

Error (Xcode): Undefined symbol: __swift_FORCE_LOAD_$_swiftCompatibility56

Could not build the application for the simulator.

Environment:

• Flutter Version: 3.22.2

• Xcode Version: 14.2.0

• CocoaPods Version: 1.15.2

• iOS Deployment Target: 15.0

• Swift Version: 5.0

  dependencies:
    cupertino_icons: ^1.0.6
    firebase_core: ^3.1.1
    firebase_auth: ^5.1.1
    google_sign_in: ^6.2.1
    another_flutter_splash_screen: ^1.2.0
    google_nav_bar: ^5.0.6
    provider: ^6.1.2
    flutter_splash_screen: ^3.0.0
    sign_in_button: ^3.2.0
    cloud_firestore: ^5.0.2
    intl: ^0.19.0
    image_picker: ^1.1.2
    permission_handler: ^11.3.1
    http: ^1.2.1
    device_preview: ^1.2.0
    firebase_messaging: ^15.0.2
    location: ^7.0.0
    url_launcher: ^6.0.20
    google_maps_flutter: ^2.7.0
  
  

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

  try {
    await Firebase.initializeApp(
      options: DefaultFirebaseOptions.currentPlatform,
    );
  } catch (e) {
    print("Error initializing Firebase: $e");
    return;
  }

  runApp(MyApp());
}

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  print("Handling a background message: ${message.messageId}");
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  Future<String> getCurrentUserId() async {
    final user = FirebaseAuth.instance.currentUser;
    if (user == null) {
      return '';
    }
    return user.uid;
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<String>(
      future: getCurrentUserId(),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const MaterialApp(
            debugShowCheckedModeBanner: false,
            home: Scaffold(
              body: Center(
                child: CircularProgressIndicator(),
              ),
            ),
          );
        } else if (snapshot.hasError) {
          print("Error getting user ID: ${snapshot.error}");
          return const MaterialApp(
            debugShowCheckedModeBanner: false,
            home: Scaffold(
              body: Center(
                child: Text('Failed to get user ID'),
              ),
            ),
          );
        } else if (!snapshot.hasData || snapshot.data!.isEmpty) {
          print("No user ID available");
          return const MaterialApp(
            debugShowCheckedModeBanner: false,
            home: AuthPage(),
          );
        } else {
          final userId = snapshot.data!;
          return MultiProvider(
            providers: [
              ChangeNotifierProvider<BalanceNotifier>(
                create: (context) => BalanceNotifier(userId),
              ),
              ChangeNotifierProvider<Cart>(
                create: (context) => Cart(),
              ),
              ChangeNotifierProvider<ThemeNotifier>(
                create: (context) => ThemeNotifier(),
              ),
            ],
            child: Consumer<ThemeNotifier>(
              builder: (context, themeNotifier, child) {
                return MaterialApp(
                  debugShowCheckedModeBanner: false,
                  theme: lightMode,
                  darkTheme: darkMode,
                  themeMode: themeNotifier.currentTheme,
                  initialRoute: '/',
                  routes: {
                    '/': (context) => const SplashScreen(),
                    '/ProfilePage': (context) => ProfilePage(),
                  },
                  onGenerateRoute: (settings) {
                    if (settings.name == '/TransfertPage') {
                      final args = settings.arguments as Map<String, dynamic>;
                      return MaterialPageRoute(
                        builder: (context) => TransfertPage(
                          total: args['total'],
                          userId: args['userId'],
                          pinController: args['pinController'],
                        ),
                      );
                    }
                    return null;
                  },
                );
              },
            ),
          );
        }
      },
    );
  }
}

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:firebase_messaging/firebase_messaging.dart';

class AuthService {
  // Google Sign In
  Future<UserCredential> signInWithGoogle() async {
    // Trigger the authentication flow
    final GoogleSignInAccount? googleUser = await GoogleSignIn().signIn();

    // Obtain the auth details from the request
    final GoogleSignInAuthentication googleAuth =
        await googleUser!.authentication;

    // Create a new credential
    final credential = GoogleAuthProvider.credential(
      accessToken: googleAuth.accessToken,
      idToken: googleAuth.idToken,
    );

    // Once signed in, return the UserCredential
    return await FirebaseAuth.instance.signInWithCredential(credential);
  }
}

Future<void> _updateDeviceToken(String userId) async {
  String? deviceToken = await FirebaseMessaging.instance.getToken();
  if (deviceToken != null) {
    await FirebaseFirestore.instance.collection('users').doc(userId).update({
      'deviceToken': deviceToken,
    });
  }
}

Steps Taken to Resolve the Issue:

1. Updated iOS Deployment Target to 15.0:

   • Modified Podfile to set platform :ios, '15.0'.

   • Updated Xcode project settings to set iOS Deployment Target to 15.0.

2. Cleaned and Reinstalled Dependencies:

   • Ran flutter clean.

   • Deleted Pods and Podfile.lock.

   • Ran pod install.

3. Verified Compatibility of Dependencies:

   • Checked all dependencies to ensure they are compatible with Swift 5 and iOS 15.0.

4. Modified Build Settings in Xcode:

   • Ensured Swift Language Version is set to 5.0.

   • Added $(inherited) to Framework Search Paths and Other Linker Flags.

Despite these steps, the issue persists. Any help or suggestions would be greatly appreciated.

Error (Xcode): Undefined symbol: __swift_FORCE_LOAD_$_swiftCompatibility56 Could not build the application for the simulator.

Thank you for your assistance!