Possible Duplicate:
program access to iPhone volume buttons
Is it possible to detect a volume up button press/release in an iOS app?
Possible Duplicate: program access to iPhone volume buttons Is it possible to detect a
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Possible Duplicate:
program access to iPhone volume buttons
Is it possible to detect a volume up button press/release in an iOS app?
Take a look at http://fredandrandall.com/blog/2011/11/18/taking-control-of-the-volume-buttons-on-ios-like-camera/
Essentially you have to initialize an audio session, make it active, and then listen for changes. Finally you initiate a callback.
However, be careful with your implementations of hardware commands. Unintentional misuse can get you banned from the app store.