IIRC Snapchat detects when a screenshot has been made by spotting that the touch event for a finger held down is suddenly cancelled. Maybe they&#x27;re doing this, then deleting the screenshot?<p>Though, is it even possible to delete camera roll items for 3rd-party apps?<p>Edit: Ah, they just notify, not prevent, much like Snapchat:<p>&gt; They cannot save it to their camera roll; and you will be notified if they ever take screenshots.<p>Edit 2: The old trick Snapchat used doesn&#x27;t work since iOS 7. Instead, it hooks a newly-added notification that a screenshot was taken.