如何能够在 iOS 上使用 FCM 接收后台通知（android 已经有效）

Question

在我的 Flutter 应用中，管理员用户可以通过 FCM 向其他用户发送通知。在 android 中已经有效，但在 iOS 中通知仅在打开应用程序时到达。我已经在互联网上尝试了很多东西，但仍然无法正常工作。

这是管理推送的 dart 代码：

Future<dynamic> myBackgroundMessageHandler(Map<String, dynamic> message) async {
  if (message.containsKey('data')) {
    // Handle data message
    final dynamic data = message['data'];
  }

  if (message.containsKey('notification')) {
    // Handle notification message
    final dynamic notification = message['notification'];
  }

  // Or do other work.
}


class PushNotificationsManager {

  PushNotificationsManager._();

  factory PushNotificationsManager() => _instance;

  static final PushNotificationsManager _instance = PushNotificationsManager
      ._();

  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  final NotificationPlugin _notificationPlugin = NotificationPlugin();

  Future<void> init() async {
    if (Platform.isIOS) {
      _firebaseMessaging.requestNotificationPermissions(
          IosNotificationSettings());
    }
    _firebaseMessaging.configure(
      // Called when the app is in the foreground and we receive a push notif.
      onMessage: (Map<String, dynamic> message) async {
        print("onMessage: ${message}");
        print(message['notification']['body']);
        _notificationPlugin.showNotification(
            title: 'TEST',
            content: message['notification']['body']
        );
        //sendNotification();
      },
      // Called when the app has been closed completely and its opened
      // from the notification directly

      //onBackgroundMessage: Platform.isAndroid ? myBackgroundMessageHandler:null,
      onBackgroundMessage: myBackgroundMessageHandler,
      onLaunch: (Map<String, dynamic> message) async {
        print("onLaunch: $message");
        if(Platform.isIOS){
          message = _modifyNotificationJson(message);
        }
      },
      // Called when the app is in the background and its opened from the notif
      onResume: (Map<String, dynamic> message) async {
        print("onMessage: ${message}");
        if(Platform.isIOS){
          message = _modifyNotificationJson(message);
        }
      },
    );

  }

  Map _modifyNotificationJson(Map<String, dynamic> message) {
    message['data'] = Map.from(message ?? {});
    message['notification'] = message['aps']['alert'];
    return message;
  }


  Future sendNotification(String body, String title) async {
    final String url = 'https://fcm.googleapis.com/fcm/send';
    var notification;
    notification =
    '{"notification": {"body": "${body}", "title": "${title}", "content_available": "true", "click_action": "FLUTTER_NOTIFICATION_CLICK"}, "priority": "high", "to": "MYTOPIC"}';
    final response = await http.post(
        url,
        headers: <String, String>{
          "Content-Type": "application/json",
          "Keep-Alive": "timeout=5",
          "Authorization": "key=MYKEY"
        },
        body: notification
    );

    print(response.body);
  }
}

AppDelegate.swift:

import UIKit
import Flutter
import Firebase

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    if #available(iOS 10.0, *) {
      // For iOS 10 display notification (sent via APNS)
      UNUserNotificationCenter.current().delegate = self

      let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
      UNUserNotificationCenter.current().requestAuthorization(
        options: authOptions,
        completionHandler: {_, _ in })
    } else {
      let settings: UIUserNotificationSettings =
      UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
      application.registerUserNotificationSettings(settings)
    }

    application.registerForRemoteNotifications()
    FirebaseApp.configure()
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

我已经在 xcode 中启用了 pushNotifications 和后台模式，已经检查了我的证书，但问题仍然存在。有人可以帮助我吗？

Answer 1

尝试将此添加到您的 info.plist

<key>FirebaseAppDelegateProxyEnabled</key>
<string>NO</string>

然后从 Firebase 控制台发送测试通知。看看能不能用。

Answer 2

删除 appdelegate.swift didFinishLaunchingWithOptions 方法中的所有内容，只保留下面两行。

GeneratedPluginRegistrant.register(with: self)

return super.application(application, didFinishLaunchingWithOptions: launchOptions)

请求 fcm 插件的许可，看看后台通知现在是否显示。

删除以下代码会阻止任何前台通知，这是默认行为，您可以使用叠加层来显示前台通知。

if #available(iOS 10.0, *) {
  // For iOS 10 display notification (sent via APNS)
  UNUserNotificationCenter.current().delegate = self
}

如何能够在 iOS 上使用 FCM 接收后台通知（android 已经有效）

How to be able to receive background notifications with FCM on iOS (android already works)

ios

firebase

swift

flutter

firebase-cloud-messaging