iPad app. Add pdf highlighter.

Provide Objective C source code for XCode necessary to addline highlighting support to a pdf viewer based on CGPDFDocument. A sample project can be found at: [login to view URL] . The user should be able to turn on highlighting. Links to non pdf documents should raise events in the application which can be handled by the code to open other viewers to be developed. For the purposes of this project a link to a video could simply display a dialog saying "File: [file path] could not be displayed". We will have many additional projects this is just an initial a proof of concept. User should be able to : - select highlighter Tools icon, and select from highlighter colors icons. - Highlight multiple line (on different location of the page). - Use multiple color on the same page. - Save the result as pdf. Please bid ONLY if you have already done this kind of feature. Proof of concept required to be a valid bidder. This was the first part of the contract. Draw feature may come after.