How to differentiate between screen lock and home button press on iOS5?

You can distinguish these two cases by checking the applicationState property of UIApplication . It will be set to UIApplicationStateInactive for an application that did enter background because of the lock screen, and to UIApplicationStateBackground otherwise.

There is a way to get this behaviour, but it comes with a caveat. You have to set the audio background mode in your Info. Plist and disable multitasking for your app.

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