It is not possible to "turn it into an app". However, it is possible to redo the content as an app, it just depends on what type of books it is.
Yes, I am a developer myself. Doing iOS app development used to be very difficult, if not impossible, for most content creators. iOS 5, however, introduced a new feature called storyboard which makes most of the app creation almost as simple as drag and drop, with some simple coding.
However, the main difference between books and apps is that books tends to have a lot of "pages". Apps tends to have lesser "pages" (called views). So if you are writing a big novel, app creation is probably not an option. But if you do have lesser pages but more multimedia stuffs, like a good multimedia children books, you can convert them to app. Or rethink what you want to do in your app. For example, my animal books have little videos and lots of pictures, but when converted to app, the focus is on the video, interactivity and less on pictures.
Also note that most apps are US$0.99 in nature, so you will need to consider this. For example, I got a music video books with 10 music video, but when converted to app, I only retain 5 music video and redesign the app to look less like a book and more like an app. Here is an example:
http://itunes.apple.com/app/chang-ge-yao-xue-ying-wen-1/id518266104
So not all books are convertable. Many are more suitable to convert to Kindle/Nook. Some multimedia books are suitable for app recreation.