Firebase 通知未显示 IOS，但消息显示在控制台上

Question

我在 IOS 设备上使用 Firebase 推送通知时遇到问题。我从 firebase 控制台发送消息，并在日志中得到它，但在我尝试过的设备上没有显示任何通知。

我一直在寻找有类似问题的帖子，我已经尝试了所有找到的方法，但仍然无法正常工作。

我在 firebase 上创建了项目，下载了 google 服务信息文件并将其放在项目的根目录中，在 xcode 上打开通知，将消息的优先级设置为高，并进行了一些更改。

我还在 podfile 中添加了“Firebase/Core”和“Firebase/Messaging”。

现在我正在使用 Firebase 为您提供的示例。这是我的代码。

import UIKit
import UserNotifications

import Firebase
import FirebaseInstanceID
import FirebaseMessaging

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  var window: UIWindow?
  let gcmMessageIDKey = "gcm.message_id"

  func application(_ application: UIApplication,
               didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

// Register for remote notifications. This shows a permission dialog on first run, to
// show the dialog at a more appropriate time move this registration accordingly.
// [START register_for_notifications]
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 })

  // For iOS 10 data message (sent via FCM)
  FIRMessaging.messaging().remoteMessageDelegate = self

} else {
  let settings: UIUserNotificationSettings =
  UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
  application.registerUserNotificationSettings(settings)
}

application.registerForRemoteNotifications()

// [END register_for_notifications]

FIRApp.configure()

// [START add_token_refresh_observer]
// Add observer for InstanceID token refresh callback.
NotificationCenter.default.addObserver(self,
    selector: #selector(self.tokenRefreshNotification),
    name: .firInstanceIDTokenRefresh,
    object: nil)
// [END add_token_refresh_observer]

return true
  }

  // [START receive_message]
  func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
// If you are receiving a notification message while your app is in the background,
// this callback will not be fired till the user taps on the notification launching the application.
// TODO: Handle data of notification

// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
  print("Message ID: \(messageID)")
}

// Print full message.
print(userInfo)
  }

  func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
               fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
// If you are receiving a notification message while your app is in the background,
// this callback will not be fired till the user taps on the notification launching the application.
// TODO: Handle data of notification

// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
  print("Message ID: \(messageID)")
}

// Print full message.
print(userInfo)

completionHandler(UIBackgroundFetchResult.newData)
  }
  // [END receive_message]

  // [START refresh_token]
  func tokenRefreshNotification(_ notification: Notification) {
if let refreshedToken = FIRInstanceID.instanceID().token() {
  print("InstanceID token: \(refreshedToken)")
}

// Connect to FCM since connection may have failed when attempted before having a token.
connectToFcm()
  }
  // [END refresh_token]

  // [START connect_to_fcm]
  func connectToFcm() {
// Won't connect since there is no token
guard FIRInstanceID.instanceID().token() != nil else {
  return;
}

// Disconnect previous FCM connection if it exists.
FIRMessaging.messaging().disconnect()

FIRMessaging.messaging().connect { (error) in
  if error != nil {
    print("Unable to connect with FCM. \(error)")
  } else {
    print("Connected to FCM.")
  }
}
  }
  // [END connect_to_fcm]

  func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
print("Unable to register for remote notifications: \(error.localizedDescription)")
  }

  // This function is added here only for debugging purposes, and can be removed if swizzling is enabled.
  // If swizzling is disabled then this function must be implemented so that the APNs token can be paired to
  // the InstanceID token.
  func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
print("APNs token retrieved: \(deviceToken)")

// With swizzling disabled you must set the APNs token here.
 FIRInstanceID.instanceID().setAPNSToken(deviceToken, type: FIRInstanceIDAPNSTokenType.sandbox)
  }

  // [START connect_on_active]
  func applicationDidBecomeActive(_ application: UIApplication) {
connectToFcm()
  }
  // [END connect_on_active]

  // [START disconnect_from_fcm]
  func applicationDidEnterBackground(_ application: UIApplication) {
// FIRMessaging.messaging().disconnect()
// print("Disconnected from FCM.")
  }
  // [END disconnect_from_fcm]
}

// [START ios_10_message_handling]
@available(iOS 10, *)
extension AppDelegate : UNUserNotificationCenterDelegate {

  // Receive displayed notifications for iOS 10 devices.
  func userNotificationCenter(_ center: UNUserNotificationCenter,
                          willPresent notification: UNNotification,
withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
let userInfo = notification.request.content.userInfo
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
  print("Message ID: \(messageID)")
}

// Print full message.
print(userInfo)
// Change this to your preferred presentation option
completionHandler([.alert,.badge,.sound])

  }

func userNotificationCenter(_ center: UNUserNotificationCenter,
                          didReceive response: UNNotificationResponse,
                          withCompletionHandler completionHandler: @escaping () -> Void) {
let userInfo = response.notification.request.content.userInfo
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
  print("Message ID: \(messageID)")
}

// Print full message.
print(userInfo)

completionHandler()
  }
}
// [END ios_10_message_handling]

// [START ios_10_data_message_handling]
extension AppDelegate : FIRMessagingDelegate {
  // Receive data message on iOS 10 devices while app is in the foreground.
  func applicationReceivedRemoteMessage(_ remoteMessage: FIRMessagingRemoteMessage) {
print(remoteMessage.appData)
}
}
// [END ios_10_data_message_handling]

Answer 1

应用需要在后台才能显示。

Answer 2

我遇到了同样的问题。检查此question 以确保一切设置正确。

我关注了这个answer、这个answer和这个answer，这就是它对我有用的原因。

但是，有一个简单的解决方法 - 看起来你必须 设置消息传递委托 (Messaging.messaging().delegate = ...) 在 FirebaseApp.configure() 之前

意思：

// add this first
Messaging.messaging().delegate = self

// add this second
FirebaseApp.configure()

和：

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    Messaging.messaging().apnsToken = deviceToken
}

还有这个

extension AppDelegate : MessagingDelegate {

    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
        print("Your Firebase FCM Registration Token: \(fcmToken)")
    }
}