Update Badge With Push Notification While App in Background

Update badge with push notification while app in background

Since push notification are handled by iOS and not your app you can't change the application badge on receiving a push notification.

But you can send the badge number in the payload of the push notification, but the you will have to do the calculation server side.

You should read Local and Push Notification Programming Guide and especially the The Notification Payload.

The payload could look like this:

"aps" : {
"alert" : "You got your emails.",
"badge" : 9

Now the app application badge icon will show 9.

Update badge number when app is closed

Can be with silent push notification, in the application:didReceiveRemoteNotification:fetchCompletionHandler: you can remote your notification with the [application setApplicationIconBadgeNumber:badgeNumber - 1];
May be This would help you.

Changing badge count in Push Notifications with Expo in background and foreground

Indeed foregrounding the app sounds as if the app was actively running in the background and could therefore run code, but as the documentation states, this is not currently feasible with Expo alone. This entails that changing the badge count while the app is in background cannot be done.

On the other hand, when the app is in foreground or the notification is being open, this becomes feasible according to this table in the documentation.

Setting an arbitrary badge count on iOS can be done with Notifications.setBadgeNumberAsync(number), whereas for Android the only option available is to make the sent push notifications count towards the badge count for a given channel.

Setting badge on app icon with push notifications when app is in background or app has been killed

You should not need to set the badge manually upon receiving a remote notification as iOS will set it automatically for you using the value in aps -> badge. This will work out of the box whether your app is active, inactive, in background or not even running (killed).

However iOS doesn't use the value to increment the badge, but to set it. So if your badge value is n in the push notification, regardless of the current badge value of your application, iOS will set it to n (not current + n). All the applications where the badge apparently increments when receiving a notification actually manage the badge count on their server and send the appropriate incremented value in the notification.

If thats the behavior that you want, this is what you should do. Typically you have a badgeCount property associated with each device on your server and you increment it every time you send a push. Then when the user opens your app you send a reset call to your server that resets this value to 0, and subsequent notifications will start back at 1.

APNs: Change the app badge while the app is the foreground

This can only be achieved through application delegate methods defined in your AppDelegate

Deprecated in iOS 10

 - (void) application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo;


- (void)application:(UIApplication *)application 
didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler;

The above delegate functions gets called when app is in foreground there you can decode your Push Payload and assign the application badge as follows

[UIApplication sharedApplication].applicationIconBadgeNumber=[[userInfo objectForKey:@"aps"] valueForKey:@"badge"];


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