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I'm pretty sure Snapchat actually does this by just checking to see if you hit the shortcut for taking a screenshot (home button + power button)

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Apparently they check for something else: http://blog.chpwn.com/post/38491252231

I do not believe the iOS SDK has access to these buttons. As other users have pointed out, screenshot detection is a hacky method of checking if touch interaction is temporarily disabled (which only(?) occurs during a screenshot).

iOS gives no access to these buttons. It looks as though this code just polls the photo library and checks if a new photo was created.

There was a different version going around earlier which checked for touches being disabled, which happens during a screenshot (but this not the only time iOS does this, I know it happens during the standard navigation "push" animation, and wouldn't be surprised if there were quite a few other standard system actions which disable touches)

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