Possible Duplicate:
Detect when home button is pressed iOS
I need to know when user presses the hold button while using my app and run a method after that. How can I do that?
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As per the duplicate I posted, the only events you can respond to (regardless of which button actually triggers the behaviour) are the application lifecycle events;
See the additional explanation here;
Is it possible to distinguish between locking the device and sending an app to background?