Firebase messaging works only in foreground - ios

Question

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[UNUserNotificationCenter currentNotificationCenter].delegate = self;
UNAuthorizationOptions authOptions =
UNAuthorizationOptionAlert
| UNAuthorizationOptionSound
| UNAuthorizationOptionBadge;
[[UNUserNotificationCenter currentNotificationCenter] requestAuthorizationWithOptions:authOptions completionHandler:^(BOOL granted, NSError * _Nullable error) {
}];
[FIRMessaging messaging].remoteMessageDelegate = self;
[[UIApplication sharedApplication] registerForRemoteNotifications];
[FIRApp configure];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(tokenRefreshNotification:)
name:kFIRInstanceIDTokenRefreshNotification object:nil];
return YES;
}
- (void)applicationWillResignActive:(UIApplication *)application {
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
[[FIRMessaging messaging] disconnect];
NSLog(#"Disconnected from FCM");
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
[self connectToFcm];
}
- (void)applicationWillTerminate:(UIApplication *)application {
}
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
// Print message ID.
NSLog(#"message 1");
if (userInfo[kGCMMessageIDKey]) {
NSLog(#"Message ID: %#", userInfo[kGCMMessageIDKey]);
}
// Print full message.
NSLog(#"%#", userInfo);
}
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
// Print message ID.
NSLog(#"message 2");
if (userInfo[kGCMMessageIDKey]) {
NSLog(#"Message ID: %#", userInfo[kGCMMessageIDKey]);
}
NSLog(#"%#", userInfo);
completionHandler(UIBackgroundFetchResultNewData);
}
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification
withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
NSLog(#"message 3");
NSDictionary *userInfo = notification.request.content.userInfo;
if (userInfo[kGCMMessageIDKey]) {
NSLog(#"Message ID: %#", userInfo[kGCMMessageIDKey]);
}
NSLog(#"full data : %#", userInfo);
completionHandler(UNNotificationPresentationOptionAlert);
}
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
withCompletionHandler:(void (^)())completionHandler {
NSDictionary *userInfo = response.notification.request.content.userInfo;
NSLog(#"message 1");
if (userInfo[kGCMMessageIDKey]) {
NSLog(#"Message ID: %#", userInfo[kGCMMessageIDKey]);
}
// Print full message.
NSLog(#"%#", userInfo);
completionHandler();
}
- (void)applicationReceivedRemoteMessage:(FIRMessagingRemoteMessage *)remoteMessage {
// Print full message
NSLog(#"applicationReceivedRemoteMessage : %#", remoteMessage.appData);
}
- (void)tokenRefreshNotification:(NSNotification *)notification {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *refreshedToken = [[FIRInstanceID instanceID] token];
NSLog(#"InstanceID token: %#", refreshedToken);
if(!(refreshedToken== nil)){
[defaults setValue:refreshedToken forKey:#"FcmToken"];
}
[self connectToFcm];
}
- (void)connectToFcm {
if (![[FIRInstanceID instanceID] token]) {
return;
}
[[FIRMessaging messaging] disconnect];
[[FIRMessaging messaging] connectWithCompletion:^(NSError * _Nullable error) {
if (error != nil) {
NSLog(#"Unable to connect to FCM. %#", error);
} else {
NSLog(#"Connected to FCM.");
}
}];
}
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
NSLog(#"Unable to register for remote notifications: %#", error);
}
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
NSLog(#"APNs token retrieved: %#", deviceToken);
}
enter code here
When app is in the background mode, message not coming. When app is running foreground mode message shows in applicationReceivedRemoteMessage function. I need to run some code when message comes when background mode. Can anyone give me the solution for get the notifications works in background mode.

Answer 1

FIRMessaging connection won’t be allowed to live when in background it
is prudent to close the connection.
Please find here reference for the same: disconnect()
FirebaseMessaging Framework Reference
Simple Logic About Chat Applications: Socket Connection
Generally, Chat applications connects with other nodes (devices) using socket connection to transmit real-time information between nodes. Socket connections are disconnected, when apps goes into background.
FirebaseMessaging works on same logic and hence is won't work in background.
To handle message transmission in background mode, use power of PushNotification.
Also mark your code: You are disconnecting FIRMessaging when application goes into background. And you've done this, because the same is instructed in FIRMessaging guidelines.
- (void)applicationDidEnterBackground:(UIApplication *)application {
[[FIRMessaging messaging] disconnect];
NSLog(#"Disconnected from FCM");
}
As an alternate solution of your problem: You may have analyzed Whatapp or Facebook Messagner app. They use push notification to alert user for messages, when app goes into background. You should do the same.