Google Cloud Messaging: Don't Receive Alerts When iOS App Is in Background

Google Cloud Messaging: don't receive alerts when iOS App is in background

Based on the GCM documentation, you can set the content_available to true.

(On iOS, use this field to represent content-available in the APNS payload. When a notification or message is sent and this is set to true, an inactive client app is awoken. On Android, data messages wake the app by default. On Chrome, currently not supported.)

The content_available is correspond to Apple's content-available, which you can find in this Apple Push Notification Service documentation.

Also, you should use Notification playload, for sending message to your iOS application, so that it can show a banner when your app is in background.

Here's a sample HTTP request:

https://gcm-http.googleapis.com/gcm/send
Content-Type:application/json
Authorization:key=API_KEY
{
   "to" : "REGISTRATION_TOKEN",
   "notification" : {
     "sound" : "default",
     "badge" : "1",
     "title" : "default",
     "body"  : "Test",
   },
   "content_available" : true,
}

The Java library is just a sample, you can add other fields to it. For example, in the Message.java class, you can add two private variables, one is private final Boolean contentAvailable, another one is private final Map<String, String> notification.

You can try a HTTP request in your terminal by doing curl -i -H "Content-Type:application/json" -H "Authorization:key=API_KEY" -X POST -d '{"to":"REGISTRATION_TOKEN", "notificaiton":{"sound":"default", "badge":"1", "title": "default", "body":"test",},"content_available":true}' https://android.googleapis.com/gcm/send, or try it in Postman.

Edited:

If your application was terminated, and you want to the push notifications to be shown in your device, you can set a high priority in your HTTP request body (beware that setting your messages to high priority contributes more to battery drain compared to normal priority messages).

Sample HTTP request:

{
   "to" : "REGISTRATION_TOKEN",
    "notification" : {
     "sound" : "default",
     "badge" : "1",
     "title" : "default",
     "body"  : "Test",
   },
   "content_available" : true,
   "priority" : "normal",
 }

Unable to receive IOS notifications from Firebase Console

Go to firebase->Project Settings->Cloud Messaging -> then scroll down to Apple app configuration and make sure you've provided APNs Production Certificate or not, if not then generate production certificate and upload it there. Alternatively i suggest you to upload APNs Authentication Key instead of certificates.

Push Notification is not received when the app is in background mode or it is force stopped iOS 10

Thanks guys for all your support. Here is the final working code for iOS 10 using Swift 3.

import UIKit
import Firebase
import UserNotifications
import FirebaseInstanceID
import FirebaseMessaging

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

  var window: UIWindow?

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    if #available(iOS 10.0, *) {
      let authOptions : UNAuthorizationOptions = [.alert, .badge, .sound]
      UNUserNotificationCenter.current().requestAuthorization(
        options: authOptions,
        completionHandler: {_,_ in })

      // For iOS 10 display notification (sent via APNS)
      UNUserNotificationCenter.current().delegate = self
      // 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()
    NotificationCenter.default.addObserver(self,
                                           selector: #selector(self.tokenRefreshNotification),
                                           name: .firInstanceIDTokenRefresh,
                                           object: nil)
    FIRApp.configure()
    return true
  }

  func applicationWillResignActive(_ application: UIApplication) {
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
  }

  func applicationDidEnterBackground(_ application: UIApplication) {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    FIRMessaging.messaging().disconnect()
    print("Disconnected from FCM.")
  }

  func applicationWillEnterForeground(_ application: UIApplication) {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
  }

  func applicationDidBecomeActive(_ application: UIApplication) {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    connectToFcm()
  }

  func applicationWillTerminate(_ application: UIApplication) {
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
  }

  func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    let chars = (deviceToken as NSData).bytes.bindMemory(to: CChar.self, capacity: deviceToken.count)
    var token = ""

    for i in 0..<deviceToken.count {
      token += String(format: "%02.2hhx", arguments: [chars[i]])
    }

    FIRInstanceID.instanceID().setAPNSToken(deviceToken, type: FIRInstanceIDAPNSTokenType.unknown)

    print("Device Token = ", token)
  }

  func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print("Did Fail to Register for Remote Notifications")
    print("\(error), \(error.localizedDescription)")
  }

  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.
    print("Message ID: \(userInfo["gcm.message_id"]!)")

    // Print full message.
    print("%@", userInfo)
  }

  // [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]

  func connectToFcm() {
    FIRMessaging.messaging().connect { (error) in
      if (error != nil) {
        print("Unable to connect with FCM. \(error)")
      } else {
        print("Connected to FCM.")
      }
    }
  }

}

@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.
    print("Message ID: \(userInfo["gcm.message_id"]!)")

    // Print full message.
    print("%@", userInfo)
  }

  @available(iOS 10, *)
  func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    print("Userinfo \(response.notification.request.content.userInfo)")
    //    print("Userinfo \(response.notification.request.content.userInfo)")
  }
}

extension AppDelegate : FIRMessagingDelegate {
  // Receive data message on iOS 10 devices.
  func applicationReceivedRemoteMessage(_ remoteMessage: FIRMessagingRemoteMessage) {
    print("%@", remoteMessage.appData)
  }
}

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