Correct way to retrieve token for FCM - iOS 10 Swift 3

Question

i had implement Firebase with FirebaseAuth/FCM etc and did sent notification successfully through Firebase Console.

However i would need to push the notification from my own app server.

i am wondering below which way is correct way to retrieve the registration id for the device:-

1) retrieve registration id token from didRegisterForRemoteNotificationWithDeviceToken

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    var token = ""

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

    print("Registration succeeded!")
    print("Token: ", token)
    Callquery(token)

}

2) Retrieve Registration token from firebase (Based on Firebase document which retrieve the current registration token)

let token = FIRInstanceID.instanceID().token()!

i was using the first way, the push notification is not being received even the registration id is stored on my app server database accordingly and i get this CURL session result :-

{"multicast_id":6074293608087656831,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}

i had also tried the second way and get fatal error while running the app as below:-

appreciated if anyone could point me the right way, thanks!

see this once it helps you http://stackoverflow.com/questions/37667753/ios-firebase-push-notifications-how-to-give-firebase-users-device-token-and-s — Anbu.Karthik, Oct 13 '16 at 07:39
Note: the deviceToken parameter in didRegisterForRemoteNotificationWithDeviceToken is NOT the Firebase registration token. You still need to call return InstanceID.instanceID().token() as explained below. — William T. Mallard, Nov 17 '18 at 02:26

score 56 · Accepted Answer · edited Oct 13 '18 at 11:54

56

The tokenRefreshNotification function doesn't always get called when launching the app.

However, when placing the code inside the regular didRegisterForRemoteNotificationsWithDeviceToken delegate function, I can get the token every time:

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    if let refreshedToken = InstanceID.instanceID().token() {
        print("InstanceID token: \(refreshedToken)")
    }
}

(Swift 3 + Firebase 4.0.4)

edited Oct 13 '18 at 11:54

Naveed Ahmad

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answered Jan 07 '17 at 15:32

Sam

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hi, how to post request token ? – Girl_engineer Apr 19 '18 at 11:09
2

In case anybody did what I did, the deviceToken:Data parameter is NOT the FCM registration token. The token from InstanceID().token() IS. – William T. Mallard Nov 17 '18 at 02:21
I get 'token()' is deprecated: Use instanceIDWithHandler: instead. for token() – May 27 '19 at 02:16
1

I did this instead: InstanceID.instanceID().instanceID { (result, error) in if error == nil { print("InstanceID token: \(result)") } else { print(error, ": Error in getting token for Fire") } } – May 27 '19 at 02:20
What about [this](https://firebase.google.com/docs/cloud-messaging/ios/client)? Registration tokens are delivered via the method `messaging:didReceiveRegistrationToken:`. This method is called generally once per app start with registration token. – Parth Jan 31 '21 at 17:37

Musa almatri · Answer 2 · 2018-07-16T11:55:31.077

44

The recommended way by Firebase:

let token = Messaging.messaging().fcmToken

Reference : Setting Up a Firebase Cloud Messaging Client App on iOS

edited Jul 16 '18 at 11:55

answered Sep 05 '17 at 13:36

Musa almatri

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score 24 · Answer 3 · edited Jun 20 '20 at 09:12

24

Swift 3 + Firebase 4.0.4 :

static var FirebaseToken : String? {
    return InstanceID.instanceID().token()
}

edited Jun 20 '20 at 09:12

Community

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answered Jul 25 '17 at 10:43

MBH

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4

Just for clarification; what is the difference between yours and the answer below (`Messaging.messaging().fcmToken`)? @MBH – j3141592653589793238 May 13 '18 at 16:18
https://stackoverflow.com/questions/44615817/what-is-the-difference-between-firinstanceid-instanceid-token-and-messaging – hmlasnk Mar 10 '20 at 14:55

score 21 · Answer 4 · answered Jun 29 '18 at 13:29

Swift 4 + Firebase (5.3.0)

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    InstanceID.instanceID().instanceID(handler: { (result, error) in
        if let error = error {
            print("Error fetching remote instange ID: \(error)")
        } else if let result = result {
            print("Remote instance ID token: \(result.token)")
        }
    })
}

score 8 · Answer 5 · answered Jun 26 '18 at 06:05

8

Swift 4

Courtesy of: https://stackoverflow.com/a/50945350/1014164

InstanceID.instanceID().instanceID { (result, error) in
    if let error = error {
        print("Error fetching remote instange ID: \(error)")
    } else if let result = result {
        print("Remote instance ID token: \(result.token)")
    }
}

answered Jun 26 '18 at 06:05

cohen72

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i got "Static member 'instanceID' cannot be used " when called in the homescreen viewdidload, **can u help?** – kemdo Jul 16 '18 at 09:41
@kemdo make sure you're writing `InstanceID.instanceID().instanceID` with the parenthesis and not `InstanceID.instanceID.instanceID` – cohen72 Jul 17 '18 at 07:17
@kemdo , Yocoh , How did you solve this when i get Static member 'instanceID...... issue ? – Jamshed Alam Aug 27 '18 at 07:30

score 6 · Answer 6 · answered Jul 05 '17 at 06:01

6

FCM Device Token swift3

    let fcmDeviceToken = FIRInstanceID.instanceID().token()
    print("FCM token: \(fcmDeviceToken ?? "")")

answered Jul 05 '17 at 06:01

jazzbpn

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score 5 · Answer 7 · answered Oct 13 '16 at 06:42

5

Go with the second option, and this is going to seem really stupid/simple, but to fix that nil optional fatal error, just remove the force-unwrap at the end

Your code:
var token = FIRInstanceID.instanceID().token()!
Make it:
var token = FIRInstanceID.instanceID().token()

That will at least fix that nasty crash

answered Oct 13 '16 at 06:42

John Leonardo

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Hi John, the error still there, it seems like the FIRInstanceID.instanceID().token() returning nil. – aznelite89 Oct 13 '16 at 07:04
1

@aznelite89, the reason why it's nil is that you haven't registered for Firebase Cloud Messaging – applejack42 Jul 07 '17 at 10:10

score 5 · Answer 8 · edited Sep 29 '17 at 12:07

First register for the firebase token refresh notification:

NotificationCenter.default.addObserver(self, selector: 
     #selector(tokenRefreshNotification), name:     
     NSNotification.Name.InstanceIDTokenRefresh, object: nil)

Then you can receive the token in the tokenRefreshNotification selector:

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()
}

Note that `InstanceIDTokenRefresh` and `FIRInstanceID` are now deprecated. — José, Nov 06 '20 at 17:25

score 5 · Answer 9 · answered Aug 21 '18 at 06:54

To Get current FCM Token

if let token = Messaging.messaging().fcmToken {
    // token is current fcmToken
}

To Renew current FCM Token

If we delete current instanceId, new token will be received vi MessagingDelegate (messaging:didReceiveRegistrationToken) a moment later.

InstanceID.instanceID().deleteID { (error) in
    if let er = error {
        print(er.localizedDescription)
    } else {
        print("instanceID().deleteID  success ---------------➤")
    }
}

score 2 · Answer 10 · answered Sep 28 '18 at 01:12

I was having the same problem, but could not figure out what was going on.

The didRegisterForRemoteNotificationsWithDeviceToken suggested by @Sam is called (almost) every time, so it is a good work around. BUT, it is NOT called the first time you open the app with the refreshed token.

So for this scenario you still need the:

func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
    print("Refreshed Token: \(fcmToken)")
}

So if you only use the:

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    if let fcmToken = InstanceID.instanceID().token() {
        print("InstanceID token: \(fcmToken)")
    }
}

You will only get the "refreshed token" the second time the user opens the app.

I managed to force a refresh token by uninstalling the app and cleaning the Build Folder (Product > Clean Build Folder). Good for testing.

Ideally it could all be handled at messaging:didReceiveRegistrationToken delegate method, but I was not able to make it work. Another way to get notified for changes in the FCM token is to listen NSNotification named kFIRMessagingRegistrationTokenRefreshNotification as suggested in the documentation: https://firebase.google.com/docs/cloud-messaging/ios/client

score 1 · Answer 11 · edited Jun 24 '21 at 11:49

First import the libraries like:

import FirebaseInstanceID
import FirebaseMessaging
import UserNotifications

set Delegate:MessagingDelegate, UNUserNotificationCenterDelegate

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, MessagingDelegate, UNUserNotificationCenterDelegate {

Write this code on didFinishLaunching():

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    
    // Override point for customization after application launch.
    FirebaseApp.configure()
    Messaging.messaging().delegate = self
    
    //remote Notifications
    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (isGranted, err) in
            if err != nil {
                //Something bad happend
            } else {
                UNUserNotificationCenter.current().delegate = self
                Messaging.messaging().delegate = self
                
                DispatchQueue.main.async {
                    UIApplication.shared.registerForRemoteNotifications()
                }
            }
        }
    } else {
        // Fallback on earlier versions
    }
    
    if #available(iOS 10, *) {
        UNUserNotificationCenter.current().requestAuthorization(options: [.badge,.sound,.alert], completionHandler: { (granted, error) in
            application.registerForRemoteNotifications()
        })
    }else{
        let notificationSettings = UIUserNotificationSettings(types: [.badge,.sound,.alert], categories: nil)
        UIApplication.shared.registerUserNotificationSettings(notificationSettings)
        UIApplication.shared.registerForRemoteNotifications()
    }
    
    return true
}

Write connectFCM method like this way:

func ConnectToFCM() {
    Messaging.messaging().shouldEstablishDirectChannel = true
    
    if let token = InstanceID.instanceID().token() {
        print("\n\n\n\n\n\n\n\n\n\n ====== TOKEN DCS: " + token)
    }

Also write delegate methods for registering and receiving push notification:

func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
    print("\n\n\n\n\n ==== FCM Token:  ",fcmToken)
    HelperFunction.helper.storeInUserDefaultForKey(name: kFCMToken, val: fcmToken)
    ConnectToFCM()
}

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    
   // UIApplication.shared.applicationIconBadgeNumber += 1
    
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "Barker"), object: nil)
}

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
   
    print(userInfo)
}

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    
    print(userInfo)
    
    completionHandler(UIBackgroundFetchResult.newData)
}
        
}

Now we can test it from firebase console.

100% working, easy and tested

Note:

Enable push notification from capability section of xcode.
check twice your both p12 certificates uploaded on firebase project setting.
Device token only can get from real device not a simulator.

score 0 · Answer 12 · answered Jan 17 '20 at 11:21

First of all, you should import all required libs

import Firebase
import UserNotifications

later in AppDelegate.swift call next function

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

    InstanceID.instanceID().instanceID { (result, error) in
        if let error = error {
            print("Error fetching remote instance ID: \(error)")
        } else if let result = result {
            print("Remote instance ID token: \(result.token)")
        }
    }
}

score 0 · Answer 13 · answered May 07 '20 at 14:58

confirm to MessagingDelegate protocol.

then you can add below delegate method and get the Firebase Token. (documentation https://firebase.google.com/docs/cloud-messaging/ios/client )

func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
        // send to remote server
        InstanceID.instanceID().instanceID { result, error in
            if let error = error {
                print("Error fetching remote instance ID: \(error)")
            } else if let result = result {
                print("Remote instance ID token: \(result.token)")
            }
        }
    }

score 0 · Answer 14 · answered Jul 03 '20 at 06:58

This question is old but still if someone want to use in Objective C.

Latest Firebase: 6.27.0

In iOS Objective C we can use like this

[[FIRInstanceID instanceID] instanceIDWithHandler:^(FIRInstanceIDResult * _Nullable result,
                                                            NSError * _Nullable error) {
            if (error != nil) {
                NSLog(@"Error : %@", error);
            } else {
                token = result.token;
            }
            NSLog(@"Token %@", result.token);
           
        }];

and to get Instance Id:

 [[FIRInstanceID instanceID] getIDWithHandler:^(NSString *identity, NSError *error) {
         if (error != nil) {
           NSLog(@"Error : %@", error);
         } else {
           NSLog(@"instance ID: %@", identity);
         }
         NSLog(@"IID %@", identity);
       }];

score -4 · Answer 15 · edited Jun 11 '18 at 07:49

-4

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

    let deviceTokenString = deviceToken.reduce("") { $0 + String(format: "%02X", $1) }

    print("APNs device token: \(deviceTokenString)"
}

edited Jun 11 '18 at 07:49

Pathak Ayush

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answered Oct 28 '16 at 08:54

Kent Chong

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What does this do? could you explain? – Zonily Jame May 04 '17 at 08:09

Correct way to retrieve token for FCM - iOS 10 Swift 3

15 Answers15

Swift 3 + Firebase 4.0.4 :

Swift 4 + Firebase (5.3.0)

Linked