Why does push notification ios work after rebooting the device? - ios

Question

I am trying to implement push notification via FCM (Firebase Cloud Messaging). Right now, I'm using Messaging.messaging().subscribe for background push notification.
But somehow one minute the push notification works and after a while it doesn't work completely. Then, when I reboot the device, push notification starts working again. What would be the problem??
This is the basic setup in AppDelegate
import UIKit
import UserNotifications
import Firebase
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
let gcmMessageIDKey = "gcm.message_id"
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
FirebaseApp.configure()
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)
}
Messaging.messaging().delegate = self
// Messaging.messaging().unsubscribe(fromTopic: "dev_store_abcde-acbcd-adbcd-bcddd") { error in
// print("unsub")
// }
application.registerForRemoteNotifications()
return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
let deviceTokenString = deviceToken.hexString
print(deviceTokenString)
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)")
}
}
}
// MARK: UISceneSession Lifecycle
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
// Called when a new scene session is being created.
// Use this method to select a configuration to create the new scene with.
return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
// Called when the user discards a scene session.
// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}
}
extension AppDelegate: MessagingDelegate {
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
print("Firebase registration token: \(fcmToken)")
let dataDict:[String: String] = ["token": fcmToken]
NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
Messaging.messaging().subscribe(toTopic: "dev_store_id") { error in
print("Subscribe to dev_store_id")
}
// TODO: If necessary send token to application server.
// Note: This callback is fired at each app startup and whenever a new token is generated.
}
func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
print("Message Data", remoteMessage.appData)
}
}
#available(iOS 10, *)
extension AppDelegate : UNUserNotificationCenterDelegate {
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
print(userInfo["value"])
UserDefaults.standard.set(true, forKey: "isNotified")
UserDefaults.standard.synchronize()
completionHandler(.newData)
}
}
extension Data {
var hexString: String {
let hexString = map { String(format: "%02.2hhx", $0) }.joined()
return hexString
}
}

Answer 1

Turns out after turning on/off wifi seems to work for the development build. If notification is deployed to the distribution build, silent notification is working considerably well.