Can the "screenshot" functionality be removed from an iPhone app?

I'm creating an iP开发者_如何学Chone app for a client who's not comfortable with allowing users the ability to take a screenshot of the app content. Is there an API to block this while the app is running?

I'm afraid it's not possible, see this duplicate question and it's answers. There are a bunch of other similar questions on SO with basically the same answer - not much you can do.

The best idea I've seen so far is to force the user to keep their finger on the touch screen to show the image (but even that is fairly easy to get around).