How do I create a caption overlay on the photos in a slide show?

I am creating a slide show iPad app. I have already modified Michael Waterfall's MWPhotoBrowser and it works fine with my photos.

I now want to add captions whic开发者_如何学编程h appear and disappear at the bottom of each photo whenever the user taps on a photo.

How else shall I proceed? Any links to point me to the right direction?

Thanks a lot..

A bit late but the current version of MWPhotoBrowser now handles captions and behaves similar to the spec above. Looks great.