iOS 15 应用程序未收到静默推送通知（=后台通知）

Question

我被困了好几天了，需要你的帮助。

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我想接收静默推送通知（又称后台通知）来更新我的应用程序内容。

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AppDelegate 中的以下部分不会被调用。

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func application(_ application: UIApplication,\n                   didReceiveRemoteNotification userInfo: [AnyHashable: Any],\n                   fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult)\n                     -> Void) {\n     \n    if let messageID = userInfo[gcmMessageIDKey] {\n      print("Message ID: \\(messageID)")  // Does not get printed\n    }\n\n      print("success") // Does not get printed\n\n    completionHandler(UIBackgroundFetchResult.newData)\n     \n}\n

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下面是服务器端的Python代码。服务器端说向设备发送通知成功，所以我认为问题出在前端。

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def send_notifications_to_fcm_token(fcm_token):\n    try:\n        message = messaging.Message(\n            apns=messaging.APNSConfig(\n                headers={\n                    'apns-push-type': 'background',\n                    'apns-priority': '5',\n                },\n                payload=messaging.APNSPayload(\n                    aps=messaging.Aps(content_available=True)\n                ),\n            ),\n            token=fcm_token,\n        )\n        response = messaging.send(message)\n    except:\n        response = False\n    return response\n

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一些附加说明。

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• “后台模式”中的以下 Xcode 设置已打开：\n“后台获取”、“远程通知”、“后台处理”

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• iPhone 的低数据模式和低功耗模式已关闭。（我已阅读背景
  \n如果这些打开，则通知不起作用。）

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• 我成功接收普通（非静默）推送通知

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让我附上整个 AppDelegate 代码以防万一：

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class AppDelegate: UIResponder, UIApplicationDelegate {\n  var window: UIWindow?\n  let gcmMessageIDKey = "gcm.message_id"\n\n  func application(_ application: UIApplication,\n                   didFinishLaunchingWithOptions launchOptions: [UIApplication\n                     .LaunchOptionsKey: Any]?) -> Bool {\n      \n    print("print did finish launching")\n      \n    FirebaseApp.configure()\n\n    // [START set_messaging_delegate]\n    Messaging.messaging().delegate = self\n    // [END set_messaging_delegate]\n    // Register for remote notifications. This shows a permission dialog on first run, to\n    // show the dialog at a more appropriate time move this registration accordingly.\n    // [START register_for_notifications]\n    if #available(iOS 10.0, *) {\n      // For iOS 10 display notification (sent via APNS)\n      UNUserNotificationCenter.current().delegate = self\n\n      let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]\n      UNUserNotificationCenter.current().requestAuthorization(\n        options: authOptions,\n        completionHandler: { _, _ in }\n      )\n    } else {\n      let settings: UIUserNotificationSettings =\n        UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)\n      application.registerUserNotificationSettings(settings)\n    }\n\n    application.registerForRemoteNotifications()\n\n    // [END register_for_notifications]\n    return true\n  }\n\n  func application(_ application: UIApplication,\n                   didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {\n    // If you are receiving a notification message while your app is in the background,\n    // this callback will not be fired till the user taps on the notification launching the application.\n    // TODO: Handle data of notification\n    // With swizzling disabled you must let Messaging know about the message, for Analytics\n    // Messaging.messaging().appDidReceiveMessage(userInfo)\n    // Print message ID.\n    if let messageID = userInfo[gcmMessageIDKey] {\n      print("Message ID: \\(messageID)")\n    }\n\n    // Print full message.\n      print("did receive remote notification print user info is \\(userInfo)")\n  }\n\n  // [START receive_message]\n  func application(_ application: UIApplication,\n                   didReceiveRemoteNotification userInfo: [AnyHashable: Any],\n                   fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult)\n                     -> Void) {\n    // If you are receiving a notification message while your app is in the background,\n    // this callback will not be fired till the user taps on the notification launching the application.\n    // TODO: Handle data of notification\n      \n    // With swizzling disabled you must let Messaging know about the message, for Analytics\n    // Messaging.messaging().appDidReceiveMessage(userInfo)\n    // Print message ID.\n      \n    //\xe3\x81\x93\xe3\x81\x93\xe3\x81\xafSilent Notification\xe3\x81\xae\xe8\xa8\xad\xe5\xae\x9a\xe3\x81\xa7\xe9\x80\x9a\xe7\x9f\xa5\xe3\x82\x92\xe9\x80\x81\xe3\x82\x89\xe3\x81\xaa\xe3\x81\x84\xe3\x81\xa8\xe3\x83\x88\xe3\x83\xaa\xe3\x82\xac\xe3\x83\xbc\xe3\x81\x95\xe3\x82\x8c\xe3\x81\xaa\xe3\x81\x84\xe6\xa8\xa1\xe6\xa7\x98\n      \n    if let messageID = userInfo[gcmMessageIDKey] {\n      print("Message ID: \\(messageID)")\n    }\n\n    // Print full message.\n      print("did receive remote notification long version print user info is \\(userInfo)")\n\n    completionHandler(UIBackgroundFetchResult.newData)\n  }\n\n  // [END receive_message]\n  func application(_ application: UIApplication,\n                   didFailToRegisterForRemoteNotificationsWithError error: Error) {\n    print("Unable to register for remote notifications: \\(error.localizedDescription)")\n  }\n\n  // This function is added here only for debugging purposes, and can be removed if swizzling is enabled.\n  // If swizzling is disabled then this function must be implemented so that the APNs token can be paired to\n  // the FCM registration token.\n  func application(_ application: UIApplication,\n                   didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {\n    print("APNs token retrieved: \\(deviceToken)")\n\n    // With swizzling disabled you must set the APNs token here.\n    // Messaging.messaging().apnsToken = deviceToken\n  }\n}\n\n// [START ios_10_message_handling]\n@available(iOS 10, *)\nextension AppDelegate: UNUserNotificationCenterDelegate {\n  // Receive displayed notifications for iOS 10 devices.\n  func userNotificationCenter(_ center: UNUserNotificationCenter,\n                              willPresent notification: UNNotification,\n                              withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions)\n                                -> Void) {\n    let userInfo = notification.request.content.userInfo\n\n    // With swizzling disabled you must let Messaging know about the message, for Analytics\n    // Messaging.messaging().appDidReceiveMessage(userInfo)\n    // [START_EXCLUDE]\n    // Print message ID.\n    if let messageID = userInfo[gcmMessageIDKey] {\n      print("Message ID: \\(messageID)")\n    }\n    // [END_EXCLUDE]\n    // Print full message.\n    print("will present print user info is \\(userInfo)") \n      \n    let categoryId = userInfo["notifications_categories_id"] //as? Int\n    //print("category id is \\(categoryId!)")\n\n    // Change this to your preferred presentation option\n    completionHandler([[.alert, .sound]])\n  }\n\n  func userNotificationCenter(_ center: UNUserNotificationCenter,\n                              didReceive response: UNNotificationResponse,\n                              withCompletionHandler completionHandler: @escaping () -> Void) {\n    let userInfo = response.notification.request.content.userInfo\n\n    // [START_EXCLUDE]\n    // Print message ID.\n    if let messageID = userInfo[gcmMessageIDKey] {\n      print("Message ID: \\(messageID)")\n    }\n    // [END_EXCLUDE]\n    // With swizzling disabled you must let Messaging know about the message, for Analytics\n    // Messaging.messaging().appDidReceiveMessage(userInfo)\n    // Print full message.\n      print("did receive print user info is \\(userInfo)") \n\n    completionHandler()\n  }\n}\n\n// [END ios_10_message_handling]\nextension AppDelegate: MessagingDelegate {\n  // [START refresh_token]\n  func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {\n    print("Firebase registration token: \\(String(describing: fcmToken))") \n\n    let dataDict: [String: String] = ["token": fcmToken ?? ""]\n    NotificationCenter.default.post(\n      name: Notification.Name("FCMToken"),\n      object: nil,\n      userInfo: dataDict\n    )\n    // TODO: If necessary send token to application server.\n    // Note: This callback is fired at each app startup and whenever a new token is generated.\n  }\n\n  // [END refresh_token]\n}\n

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编辑：\n我发现此错误消息正在控制台日志中打印。\n[connection] nw_read_request_report [C2] 接收失败，错误为“软件导致连接中止”

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