iOS: Check if the Phone is Locked

Question

Is there a way to check if the phone is locked? Or do I receive a notification of the phone is going to be locked?

My app runs in the background, continues to play audio, so applicationWillResignActive: isn't really what I am looking for.

Answer 1

Checkout UIApplicationProtectedDataWillBecomeUnavailable. This appears to be called when the device is locked. iOS4 + only.

UIApplicationProtectedDataWillBecomeUnavailable

http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/AdvancedAppTricks/AdvancedAppTricks.html