Firebase listener when app is in the background

Question

I have a Firebase childAdded event listener for the notifications table in my app that I would like to trigger push notifications when the app is in the backgro

Answer 1

You can add background task to firebase observer

@objc func observeNotificationsChildAddedBackground() {

      var backgroundTask: UIBackgroundTaskIdentifier = UIBackgroundTaskInvalid

      backgroundTask = UIApplication.shared.beginBackgroundTask {
           [unowned self] in
           UIApplication.shared.endBackgroundTask(backgroundTask)
           backgroundTask = UIBackgroundTaskInvalid
      }
      assert(backgroundTask != UIBackgroundTaskInvalid)

      self.notificationsBackgroundHandler = FIREBASE_REF!.child("notifications/\(Defaults.userUID!)")

      self.notificationsBackgroundHandler!.queryOrdered(byChild: "date").queryLimited(toLast: 99).observe(.childAdded, with: { snapshot in

           let newNotificationJSON = snapshot.value as? [String : Any]

           if let newNotificationJSON = newNotificationJSON {

                   let status = newNotificationJSON["status"]

                   if let status = status as? Int {

                   if status == 1 {
                      self.sendPushNotification()
                   }
            }
         }
     })
}