我正在使用flutter_local_notifications包在应用程序内外显示通知（后台模式）。在Android（调试+发布）和iOS调试模式下，一切都按预期运行，但奇怪的是，在iOS发布的后台模式下，本地通知不显示。
我不知道为什么iOS的发布模式表现不同，有什么想法吗？
谢谢.
我已经检查过了：

• 使用最新版本的flutter_local_notifications软件包（v16.1.0）
• 检查调试和发布模式的“签名和功能”（后台模式：获取、远程通知）

我的通知类别：

import 'dart:async';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
class ReceivedNotification {
  ReceivedNotification({
    required this.id,
    required this.title,
    required this.body,
    required this.payload,
  });
  final int id;
  final String? title;
  final String? body;
  final String? payload;
}
/// A notification action which triggers a App navigation event
const String navigationActionId = 'id_3';
@pragma('vm:entry-point')
void notificationTapBackground(NotificationResponse notificationResponse) {
  // ignore: avoid_print
  print('notification(${notificationResponse.id}) action tapped: '
      '${notificationResponse.actionId} with'
      ' payload: ${notificationResponse.payload}');
  if (notificationResponse.input?.isNotEmpty ?? false) {
    // ignore: avoid_print
    print(
        'notification action tapped with input: ${notificationResponse.input}');
  }
}
class NotificationService {
  //Singleton pattern
  static final NotificationService _notificationService =
      NotificationService._internal();
  factory NotificationService() {
    return _notificationService;
  }
  NotificationService._internal();
  /// Streams are created so that app can respond to notification-related events
  /// since the plugin is initialised in the `main` function
  final StreamController<ReceivedNotification>
      didReceiveLocalNotificationStream =
      StreamController<ReceivedNotification>.broadcast();
  final StreamController<String?> selectNotificationStream =
      StreamController<String?>.broadcast();
  //instance of FlutterLocalNotificationsPlugin
  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();
  Future<void> initialize() async {
    const AndroidInitializationSettings initializationSettingsAndroid =
        AndroidInitializationSettings('@drawable/iclauncher');
    //Initialization Settings for iOS devices
    final DarwinInitializationSettings initializationSettingsDarwin =
        DarwinInitializationSettings(
      requestSoundPermission: true,
      requestBadgePermission: true,
      requestAlertPermission: true,
      onDidReceiveLocalNotification:
          (int id, String? title, String? body, String? payload) async {
        didReceiveLocalNotificationStream.add(
          ReceivedNotification(
            id: id,
            title: title,
            body: body,
            payload: payload,
          ),
        );
      },
    );
    final InitializationSettings settings = InitializationSettings(
      android: initializationSettingsAndroid,
      iOS: initializationSettingsDarwin,
    );
    await flutterLocalNotificationsPlugin.initialize(
      settings,
      onDidReceiveNotificationResponse:
          (NotificationResponse notificationResponse) {
        switch (notificationResponse.notificationResponseType) {
          case NotificationResponseType.selectedNotification:
            selectNotificationStream.add(notificationResponse.payload);
            break;
          case NotificationResponseType.selectedNotificationAction:
            if (notificationResponse.actionId == navigationActionId) {
              selectNotificationStream.add(notificationResponse.payload);
            }
            break;
        }
      },
      onDidReceiveBackgroundNotificationResponse: notificationTapBackground,
    );
  }
  Future<NotificationDetails> _notificationDetails() async {
    const AndroidNotificationDetails androidNotificationDetails =
        AndroidNotificationDetails(
      'channel ID',
      'channel name',
      playSound: true,
      priority: Priority.high,
      importance: Importance.high,
    );
    const NotificationDetails notificationDetails =
        NotificationDetails(android: androidNotificationDetails);
    return notificationDetails;
  }
  Future<void> showNotification({
    required int id,
    required String title,
    required String body,
  }) async {
    final details = await _notificationDetails();
    await flutterLocalNotificationsPlugin.show(id, title, body, details);
  }
}

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