UIApplication.SharedApplication.RegisterUserNotificationSettings( new UIUserNotificationSettings( UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound, null ) );In this example, we're registering user notification settings that allow alerts, badges, and sounds to be played when a notification is received. The null parameter specifies that we're not using any custom notification categories, and the package library being used here is the UIKit framework, which provides a number of user interface-related classes for iOS apps.