didReceiveRemoteNotification function doesn't called with FCM notification server - ios

Question

I'm using FCM server for remote notifications, it worked perfectly with sending and receiving notifications.
My problem is when the device is in the background, this function func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) doesn't called.
Solutions that I've tried:
This function:
userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void)
is called when user tapped on the notification. Otherwise, it's not triggered.
Adding "content-available": true, "priority": "high" to the payload. Also, I tried this value "content-available": 1.
This is my function code:
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any],
fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
print("userInfo: \(userInfo)")
completionHandler(.newData);
}

Answer 1

Just adding on accepted answer: in my case the problem was the same, but as I'm sending the Notification through an http "POST" NSMUtableRequest the way to apply the accepted answer was to actually add it in the notification parameters together with sound, badge, tiles etc etc..
let postParams: [String : Any] = [
"to": receiverToken,
"notification": [
"badge" : 1,
"body": body,
"title": title,
"subtitle": subtitle,
"sound" : true, // or specify audio name to play
"content_available": true, // this will call didReceiveRemoteNotification in receiving app, else won't work
"priority": "high"
],
"data" : [
"data": "ciao",
]
]
Hope this will also help others, as I spent a long time trying to figure out how to apply this solution.
Many thanks.

Answer 2

If you are testing with Postman then try changing "content-available": true to "content_available" : true. content-available will send notification but it doesn't call didReceiveRemoteNotification.

Answer 3

All you need to see remote notification in background and foreground and show as alert when app run are this appDelegate.swift that i used in my code:
import Firebase
import UserNotifications
import FirebaseMessaging
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
let gcmMessageIDKey = "gcm_message_id"
var deviceID : String!
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// [START set_messaging_delegate]
Messaging.messaging().delegate = self
// [END set_messaging_delegate]
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 })
} else {
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
application.registerUserNotificationSettings(settings)
}
application.registerForRemoteNotifications()
FirebaseApp.configure()
Fabric.sharedSDK().debug = true
return true
}
func showNotificationAlert(Title : String , Message : String, ButtonTitle : String ,window : UIWindow){
let alert = UIAlertController(title: Title, message: Message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: ButtonTitle, style: .cancel, handler: nil))
window.rootViewController?.present(alert, animated: true, completion: nil)
}
// [START receive_message] remote notification
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
// 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) {
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: \(messageID)")
}
// Print full message.
print(userInfo)
completionHandler(UIBackgroundFetchResult.newData)
}
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 FCM registration token.
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
print("APNs token retrieved: \(deviceToken)")
// With swizzling disabled you must set the APNs token here.
// Messaging.messaging().apnsToken = deviceToken
}
}
// [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
// With swizzling disabled you must let Messaging know about the message, for Analytics
// Messaging.messaging().appDidReceiveMessage(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)")
}
if let aps = userInfo["aps"] as? NSDictionary {
if let alert = aps["alert"] as? NSDictionary {
if let title = alert["title"] as? NSString {
let body = alert["body"] as? NSString
showNotificationAlert(Title: title as String, Message: body! as String, ButtonTitle: "Ok", window: window!)
}
} else if let alert = aps["alert"] as? NSString {
print("mohsen 6 =\(alert)")
}
}
// Print full message.
print(userInfo)
completionHandler()
}
}
// [END ios_10_message_handling]
extension AppDelegate : MessagingDelegate {
// [START refresh_token]
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
print("Firebase registration token: \(fcmToken)")
deviceID = fcmToken
let dataDict:[String: String] = ["token": fcmToken]
NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
// TODO: If necessary send token to application server.
// Note: This callback is fired at each app startup and whenever a new token is generated.
}
// [END refresh_token]
// [START ios_10_data_message]
// Receive data messages on iOS 10+ directly from FCM (bypassing APNs) when the app is in the foreground.
// To enable direct data messages, you can set Messaging.messaging().shouldEstablishDirectChannel to true.
func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
print("Received data message: \(remoteMessage.appData)")
}
// [END ios_10_data_message]
}

Answer 4

The first thing you need to check is the Background Mode > Remote Notification is on. If not, it will not be invoked in the background mode.

Answer 5

Step 1 – Add framework
import UserNotifications
Step 2 – Inherit AppDelegate with UNUserNotificationCenterDelegate
final class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {}
Step 3 – Make appropriate changes for registerPushNotifications and call it didFinishLaunchingWithOptions
private func registerPushNotifications() {
if #available(iOS 10.0, *) {
UNUserNotificationCenter.currentNotificationCenter().delegate = self
UNUserNotificationCenter.currentNotificationCenter().requestAuthorizationWithOptions([.Badge, .Sound, .Alert], completionHandler: { granted, error in
if granted {
UIApplication.sharedApplication().registerForRemoteNotifications()
} else {
// Unsuccessful...
}
})
} else {
let userNotificationTypes: UIUserNotificationType = [.Alert, .Badge, .Sound]
let settings = UIUserNotificationSettings(forTypes: userNotificationTypes, categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)
UIApplication.sharedApplication().registerForRemoteNotifications()
}
}
Step 4 – Implement new handlers
// leave this for older versions
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
}
// For iOS10 use these methods and pay attention how we can get userInfo
// Foreground push notifications handler
#available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, willPresentNotification notification: UNNotification, withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void) {
if let userInfo = notification.request.content.userInfo as? [String : AnyObject] {
// Getting user info
}
completionHandler(.Badge)
}
// Background and closed push notifications handler
#available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, didReceiveNotificationResponse response: UNNotificationResponse, withCompletionHandler completionHandler: () -> Void) {
if let userInfo = response.notification.request.content.userInfo as? [String : AnyObject] {
// Getting user info
}
completionHandler()
}

Answer 6

As you tried i believe every thing , background permission is enable , content-available is the part of payload, you are also receiving notification in active state, last thing will be Power save mode, you need to check is power saving is off; as if you Phone is in power saving mode, then background refresh and other process is gone in limited state, so app will not call didReceivedNotifcation in background.