Before IOS 17.0, we can update the badge by providing the badge number when schedule a notification like this:

let content = UNMutableNotificationContent()
        content.title = "...."
        content.badge = NSNumber(value: UIApplication.shared.applicationIconBadgeNumber + 1)
// ...
let request = UNNotificationRequest(...)
UNUserNotificationCenter.current().add(request) {...}

But now there is an warning: 'applicationIconBadgeNumber' was deprecated in iOS 17.0: Use -[UNUserNotificationCenter setBadgeCount:withCompletionHandler:] instead.

How can I update the badge number when a local notification is delivered when app running at background?

EDIT:

I have tried UNUserNotificationCenterDelegate to update the badge number with UNUserNotificationCenter.current().setBadgeCount(notificationCount) , but it seems can only handle both case:

• userNotificationCenter(_ center:, willPresent:): get called the app was running in the foreground.
• userNotificationCenter(_ center:, didReceive:): get called user interact with the notification.