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How to add a number over your app icon using applicationIconBadgeNumber

Swift version: 5.2

Paul Hudson    @twostraws   

Once your app has the user’s permission to do so, you can show numbers over your icon to indicate outstanding tasks, unread messages, game invites, or whatever makes sense for your app.

You do need to get their permission, though, so you should start by adding an import for the UserNotifications framework, then request permission with code like this:

UNUserNotificationCenter.current().requestAuthorization(options: .badge) { (granted, error) in
    if error != nil {
        // success!
    }
}

Once you have that permission – anywhere inside the // success! comment or at some point afterwards – you can place an integer badge of your app icon with one line of code:

UIApplication.shared.applicationIconBadgeNumber = 1
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