New features of iOS: detect when a user takes a screenshot

In any iOS device you can take an screenshot by:

1) Pressing and holding the Home button (the main button below the screen)
2) While the menu button is held down, press the power/lock button (the switch on the top edge of the device).

But how to detect if the user took an screenshot? Well, now with iOS is easy.  Welcome to the brand-new notification event UIApplicationUserDidTakeScreenshotNotification. Just subscribe to this event to know when an screenshot is taken.