要保存对象：
1.用toMap()方法将对象转换为Map
1.使用serialize(...)方法将Map序列化为字符串
1.将字符串保存到安全存储器中
用于还原对象：
1.使用deserialize(...)方法将安全存储字符串反序列化为Map
1.使用fromJson()方法得到你的对象
这样，您就可以将数据序列化为字符串，然后保存和检索它们。

class MyUserModel {
    String authKey;
    String city;
    String contact;
    dynamic email;
    bool isContact;
    int userId;

  MyUserModel({
    required this.authKey,
    required this.city,
    required this.contact,
    required this.email,
    required this.isContact,
    required this.userId,
  });

  factory MyUserModel.fromJson(Map<String, dynamic> jsonData) =>
    MyUserModel(
      authKey: jsonData['auth_key'],
      city: jsonData['city'],
      contact: jsonData['contact'],
      email: jsonData['email'],
      isContact: jsonData['is_contact'] == '1',
      userId: jsonData['user_id'],
    );
  }

  static Map<String, dynamic> toMap(MyUserModel model) => 
    <String, dynamic> {
      'auth_key': model.authKey,
      'city': model.city,
      'contact': model.contact,
      'email': model.email,
      'is_contact': model.isContact ? '1' : '0',
      'user_id': model.userId,
    };

  static String serialize(MyUserModel model) =>
    json.encode(MyUserModel.toMap(model));

  static MyUserModel deserialize(String json) =>
    MyUserModel.fromJson(jsonDecode(json));
}

用法：

final FlutterSecureStorage storage = FlutterSecureStorage();

await storage.write(key: key, value: MyUserModel.serialize(model));

MyUserModel model = MyUserModel.deserialize(await storage.read(key: key));

您可以将Model编码为json并保存在Secure Storage中，然后解码json并取回模型。

// Saving model into Storage
static Future<void> setMyUserModel(MyUserModel user) async {
  await const FlutterSecureStorage().write(
    key: 'user', value: user.toRawJson());
}

// Getting model from storage
static Future<MyUserModel> getMyUserModel() async {
  return MyUserModel.fromRawJson(
      await const FlutterSecureStorage().read(key: 'user') ??
          '{}');
}

当然，您需要在模型中实现fromRawJson()和toRawJson()。
抱歉，回复太晚了。

为此，将模型编码为JSON并存储在安全的存储器中，然后解码JSON以检索模型。

final storage =  FlutterSecureStorage(); 
static const String modelData = "modelData";

// Saving model into Storage
static Future<void> setModel(user) async {
  final jsonDataEncoded = jsonEncode(jsonData);
    await storage.write(key: modelData , value: jsonDataEncoded);
}

//call this when you want to store your data to secured storage
 ClassName.setModel(decodedResponse);//decode your json and send it here

//to read data from the local storage || secured storage
static Future<MyModel> getDataFromLocalStorage() async {
    final jsonModel = await storage.read(key: modelData);
    final jsonData = jsonDecode(jsonModel.toString());
    final items = List.from(jsonData);
    dataList = items.map((e) => MyModel.fromJson(e)).toList();
    return dataList;
  }