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How to get push notification with FCM in background on iOS (Swift4)

How to get push notification in background? I have a problem in Swift4 iOS 11 with push notifications with FCM unable to retrieve notifications in the background only when the application is opened. Please help. thanks.

this is my coding:

AppDelegate.swift

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

var window: UIWindow?
static var DEVICE_ID = String()

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

UIApplication.shared.statusBarStyle = .lightContent

FirebaseApp.configure()

if #available(iOS 10.0, *)
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.current().delegate = self

UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound], completionHandler: (success, error) in
print(success)
)

Messaging.messaging().delegate = self

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


application.registerForRemoteNotifications()

return true


func connectToFcm()
Messaging.messaging().shouldEstablishDirectChannel = true

if let token = InstanceID.instanceID().token()
AppDelegate.DEVICE_ID = token
print("*********")
print("Token Instance: (token)")
print("*********")



func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)

completionHandler([.alert, .sound])



func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String)
connectToFcm()


func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage)

guard let data: [String: Any] = remoteMessage.appData as? [String: Any] else
return


print(data)




func applicationDidBecomeActive(_ application: UIApplication)
UIApplication.shared.applicationIconBadgeNumber = 0
connectToFcm()


func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void)


completionHandler(.newData)







Example: image send push notification with postman

2 Answers
2

I am not able to find out the issue in your code but I am posting the steps how it should be done :-

Register for Push notifications

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


FirebaseApp.configure()
self.registerForPushNotifications(application)
return true

func registerForPushNotifications(_ application: UIApplication)
Messaging.messaging().delegate = self
if #available(iOS 10, *)

let center = UNUserNotificationCenter.current()
center.requestAuthorization(options:[.badge, .alert, .sound]) (granted, error) in
// Enable or disable features based on authorization.

center.delegate=self
application.registerForRemoteNotifications()

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




2.Then handle your didRegisterForRemoteNotificationsWithDeviceToken delegate :-

func application(_ application: UIApplication,

didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)
Messaging.messaging().apnsToken = deviceToken




Handle your Firebase Messaging delegate :-

extension AppDelegate: MessagingDelegate
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String)

let token = fcmToken
// you can send your token to Server, from where you'll get the Push Notification





4.Then handle your UNUserNotificationCenterDelegate :-

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
// this is called when application is Foreground and push arrives we show alert, sound, here.
completionHandler([.alert, .sound])


func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Swift.Void)
let pushDictionary = response.notification.request.content.userInfo
// handle your push here



this source code in AppDelegate.swift:

import UIKit
import UserNotifications
import FirebaseCore
import FirebaseMessaging
import FirebaseInstanceID

struct DataNotif: Codable
var title: String?
var body: String?

private enum CodingKeys: String, CodingKey
case title
case body



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

var window: UIWindow?
let gcmMessageIDKey = "message_id"

static var DEVICE_ID = String()
var msg_body = ""
var msg_title = ""

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

UIApplication.shared.statusBarStyle = .lightContent

FirebaseApp.configure()

Messaging.messaging().delegate = self

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()

return true


func connectToFcm()
Messaging.messaging().shouldEstablishDirectChannel = true


func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)

if let refreshedToken = InstanceID.instanceID().token()
AppDelegate.DEVICE_ID = refreshedToken
print("*********")
print("InstanceID token: (refreshedToken)")
print("*********")
else
print("Can't get token device")


connectToFcm()



func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error)
print("Failed to register for remote notifications with error: (error)")


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

print(userInfo)

guard let data: [String: Any] = userInfo as? [String: Any] else
return


let listData = data["notification"] as! String
let jsonData = listData.data(using: .utf8)
do
let decoder = JSONDecoder()
let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)

msg_body = dataJson.body!
msg_title = dataJson.title!

createNotification(title: msg_title, body: msg_body)

catch
print("error")


completionHandler(.newData)


// messaging
func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String)

if let token = InstanceID.instanceID().token()
AppDelegate.DEVICE_ID = token
print("*********")
print("Token Instance: (token)")
print("*********")


connectToFcm()


func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage)

print("Received data message: (remoteMessage.appData)")

guard let data: [String: Any] = remoteMessage.appData as? [String: Any] else
return


print(data)

let listData = data["notification"] as! String
let jsonData = listData.data(using: .utf8)
do
let decoder = JSONDecoder()
let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)

msg_body = dataJson.body!
msg_title = dataJson.title!

createNotification(title: msg_title, body: msg_body)

catch
print("error")




func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)

completionHandler([.alert, .badge, .sound])


func applicationDidBecomeActive(_ application: UIApplication)
UIApplication.shared.applicationIconBadgeNumber = 0
connectToFcm()


func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void)

if let vc = window?.rootViewController as? HomeController
vc.scheduleNotification()


completionHandler(.newData)



func applicationDidEnterBackground(_ application: UIApplication)
Messaging.messaging().shouldEstablishDirectChannel = false
print("Disconnect FCM")


func createNotification(title: String, body: String)
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey: title, arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: body, arguments: nil)
content.sound = UNNotificationSound.default()
content.badge = NSNumber(integerLiteral: UIApplication.shared.applicationIconBadgeNumber + 1)

let request = UNNotificationRequest.init(identifier: "pushNotif", content: content, trigger: nil)

let center = UNUserNotificationCenter.current()
center.add(request)





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