在手机钥匙串 Flutter 中保存 firebase 凭据

Question

我正在寻找恢复在 Textformfield 中输入的电子邮件和密码，以将它们保存在手机钥匙串中。这是要使用的代码

class AuthMethodFirebase {
  String mail;
  String password;
  BuildContext context;

  AuthMethodFirebase({required this. mail, required this. password, required this.context});

  FirebaseAuth firebaseAuth = FirebaseAuth.instance;

  // Creation of the secure storage variable
  final flutterStorage = const FlutterSecureStorage();

  // Creating options for iOS
  final iosOptions = const IOSOptions(
    accountName: "My app",
    accessibility: KeychainAccessibility.unlocked,
  );
  
  // Creating options for Android
  final androidOptions = const AndroidOptions(
    sharedPreferencesName: "My app",
    encryptedSharedPreferences: true,
  );

  Future authMethod() async {
    // Saving the connection data in the secure storage
    await flutterStorage.write(key: 'secret_key1', value: mail);
    await flutterStorage.write(key: 'secret_key2', value: password);

    // Retrieve connection data from secure storage for connection
    final getStorageMail = await flutterStorage.read(key: 'secret_key1');
    final getStoragePassword = await flutterStorage.read(key: 'secret_key2');

      // Login to Firebase account
      await firebaseAuth.signInWithEmailAndPassword(email: getStorageMail!, password: getStoragePassword!).then((value) {
        // Reading of all inputs with option assignments
        flutterStorage.readAll(iOptions: iosOptions, aOptions: androidOptions);
      });
   }
}

但是，当我按下执行我的 authMethod() 函数的按钮时，我的手机 (iPhone) 不让我保存输入钥匙串中的数据，甚至根本不保存它们，我该怎么做？

我使用的包：https://pub.dev/packages/flutter_secure_storage