Mobile app developed in Titanium Appcelerator

We have a project developed in Appcelerator that has not been completed, I need someone to take the code and make some changes and get me an app I can demo on an iPhone initially. The app will store about 20 PDF documents related to building regulations. When the user opens the app they will see an image, then the touch an area of the image a drop down will show with a list of words related to that area, eg: they select roof which shows a drop down of (tiles, roof beam, support truss , etc etc). The user then selects an item from the drop down and the next page shows a list of the PDF that have this term, the user then selects the PDF they are interested in and the next page shows a list of all the pages in that PDF where that term appears. We are using a plugin that searches PDF's (PSPDFKit i think) but I'm not sure if it allows us to do exactly what is required. Unfortunately our developer has left and I don't have as much detail on what has been done. I will supply the current code base and I need this code base updated. I will supply more precise details and more exact requirements once I award the project.