Although not part of the iPhone SDK, CFUserNotification does exist on the iPhoneOS. These notifications are shown on SpringBoard like standard alert views.
CFUserNotifications are sent to SpringBoard via the com.apple.SBUserNotification service, and a SBUserNotificationAlert will be shown.
References
- Official documentation: http://developer.apple.com/mac/library/documentation/CoreFoundation/Reference/CFUserNotificationRef/Reference/reference.html
- Source code: http://www.opensource.apple.com/source/CF/CF-550/CFUserNotification.c
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