Is it possible to distinguish between locking the device and sending an app to background?

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iOS 6

In my preliminary testing via the simulator, checking the application state with 

[[UIApplication sharedApplication] applicationState]

in either 

- (void)applicationWillEnterForeground:(UIApplication *)application

- (void)applicationDidEnterBackground:(UIApplication *)application

allows you to differentiate between a call to lock the device and just switching back to the homescreen. A lock screen will return 1 (UIApplicationStateInactive), whereas a home button press will register as a 2 (UIApplicationStateBackground).

It seems consistent and should work on an iOS device just as reliably as it does in the simulator.

iOS 7

The iOS 6 method no longer works in iOS 7. In order to do this now, you have to utilize CFNotificationCenter and listen for a darwin notification (labeled: com.apple.springboard.lockcomplete). You can find the github repo with the sample project here: https://github.com/binarydev/ios-home-vs-lock-button

Credit for the iOS 7 fix goes out to wqq

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