I'm developing an alarm clock app that needs to turn itself on when the phone does so that my users don't miss their appointments. Is it possible/legal? How does one go about getting it done?
iPhone 5, iOS 6
Here is an overview of process management on iOS, and there's a section there entitled Scheduling the Delivery of Local Notifications with a demo of setting up an alarm. Here is some details on scheduling notifications with UILocalNotification.
FWIW, the Apple developer forums (access is restricted to registered iOS developers) would be a more typical spot for developer-related questions involving iOS.
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