Paul_D Paul_D - 1 year ago 1170
Swift Question

ios10, Swift 3 and Firebase Push Notifications (FCM)

I am struggling to display my push notifications that I am sending to my device from the FCM notification console. I can see the device is receiving the notification because I can see the message I send "test8"

Connected to FCM.
%@ [AnyHashable("notification"): {
body = test8;
e = 1;

But it does not matter if my app is in the foreground or background I don't get the notification displayed.

I have added "Required background modes - App downloads content in response to push notifications" to the info.plist. My certificates are correct and I have no issue generating a token. My app is receiving the notifications but just not displaying them.

import UIKit
import UserNotifications
import Firebase
import FirebaseInstanceID
import FirebaseMessaging

class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

// [START register_for_notifications]
if #available(iOS 10.0, *) {
let authOptions : UNAuthorizationOptions = [.Alert, .Badge, .Sound]
completionHandler: {_,_ in })

// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.currentNotificationCenter().delegate = self
// For iOS 10 data message (sent via FCM)
FIRMessaging.messaging().remoteMessageDelegate = self

} else {
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil)

// [END register_for_notifications]


// Add observer for InstanceID token refresh callback.
selector: #selector(self.tokenRefreshNotification),
name: kFIRInstanceIDTokenRefreshNotification,
object: nil)

return true

// [START receive_message]
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject],
fetchCompletionHandler completionHandler: (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)
// [END receive_message]

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

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

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

func applicationDidBecomeActive(application: UIApplication) {

// [START disconnect_from_fcm]
func applicationDidEnterBackground(application: UIApplication) {
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,
willPresentNotification notification: UNNotification,
withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void) {
let userInfo = notification.request.content.userInfo
// Print message ID.
print("Message ID: \(userInfo["gcm.message_id"]!)")
// Print full message.
print("%@", userInfo)

extension AppDelegate : FIRMessagingDelegate {
// Receive data message on iOS 10 devices.
func applicationReceivedRemoteMessage(remoteMessage: FIRMessagingRemoteMessage) {
print("%@", remoteMessage.appData)
// [END ios_10_message_handling]

I having been trying to research and solve this issue on my own but I am having issues. Any help or suggestions would be greatly appreciated.

Answer Source

Inside method didRegisterForRemoteNotificationsWithDeviceToken, add the following code:

func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
    let tokenChars = UnsafePointer<CChar>(deviceToken.bytes)
    var tokenString = ""

    for i in 0..<deviceToken.length {
        tokenString += String(format: "%02.2hhx", arguments: [tokenChars[i]])

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

    print("tokenString: \(tokenString)")

And do not forget to enable Push Notifications inside Capabilities.

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