在使用Flutter应用程序的iOS中无法触发UNUserNotificationCenterDelegate didReceive

import UserNotifications

class AppDelegate: FlutterAppDelegate, UNUserNotificationCenterDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    
    UNUserNotificationCenter.current().delegate = self
    
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    // 处理通知点击事件
    completionHandler()
  }
}

import 'package:flutter/material.dart';
import 'package:firebase_messaging/firebase_messaging.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              FirebaseMessaging.onMessage.listen((RemoteMessage message) {
                print('Got a message whilst in the foreground!');
                print('Message data: ${message.data}');
              });
            },
            child: Text('Listen for messages'),
          ),
        ),
      ),
    );
  }
}

UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, error in
  print("Permission granted: \(granted)")
}