A notification service app extension ships as a separate bundle inside your iOS app. To add this extension to your app: Select File > New > Target in Xcode.IOS push notifications are brief messages appearing directly on a user's device either as an alert or a badge on the app's icon even while the app is inactive. Log into your DraftKings account on the DraftKings Fantasy Sports app. Tap your profile photo in the top right corner. In this tutorial, we'll show you how to add push notifications to your iOS app for free using OneSignal. A UNNotificationServiceExtension object provides the entry point for a notification service app extension. Discover how push notifications can boost app click-through rates, retention rates and conversions. Plus, find the best push notification services for you. To set up push notifications for iOS devices, you must use the Apple Push Notification Service (APNs).