如何将加密的 Hive Box 调用到类中？

Question

我需要加密一个配置单元框，其中将在 Api_Page_() 中调用框 'user_api' 以接收用户输入并存储在所述框内。但是，encryptedBox 未在类中定义。 Hive 文档显示加密代码将在 main() 函数内部完成，我已经完成了，但我不确定如何在 main()< /代码>。 非常感谢任何帮助或建议！

我的代码：

import 'dart:convert';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:hive/hive.dart';
import 'package:path_provider/path_provider.dart';



Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // HIVE ENCRYPTION----------------------------------------
  const secureStorage = FlutterSecureStorage();

  final encryptionKey = await secureStorage.read(key: 'key');
  if (encryptionKey == null) {
    final key = Hive.generateSecureKey();
    await secureStorage.write(
      key: 'key',
      value: base64Encode(key),
    );
  }
  final key = await secureStorage.read(key: 'key');
  final encryptKey = base64Url.decode(key);
  print('Encryption key: $encryptKey');
  // HIVE ENCRYPTION----------------------------------------


  // HIVE INIT---------------------------------------------
  Directory directory = await getApplicationDocumentsDirectory();
  Hive.init(directory.path);
  await Hive.initFlutter();
  final encryptedBox = Hive.openBox<String>('user_api', encryptionCipher: HiveAesCipher(encryptKey));     // Initially Opens Box on App Start
  // HIVE INIT---------------------------------------------



  runApp(myApp());
}


class myApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

    
    return const MaterialApp(
      debugShowCheckedModeBanner: false,    // Removes Debug Banner. [Delete before app release]
      title: 'App Title Placeholder',
      home: API_Page_()                   // Calls API_Page_ class from api_page.dart
    );
  }
}

class API_Page_ extends StatelessWidget {
  const API_Page_({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: RaisedButton(onPressed: () { var eBox = encryptedBox<String>('user_api');
        },
      )
    );
  }
}