title: PDF viewing/annotating library for iPhone?
body: <p>I am currently working on an educational project where I would like to add some PDF reading functionality to an iPhone app. I know that it is possible to add a UIWebView and display the PDF there, however I would like to add the ability to show page number, 'next', 'previous' buttons etc. Is CGPDFDocument the direction that I should be headed or is there a better (ie more feature rich) library available? I have had a look around to try and find the capabilities of CGPDFDocument, but besides the API reference there is not much available. </p>
  
  <p>Would it also be possible with this to annotate a pdf? </p>
  
  <p>Thanks </p>
  
  <p>JP</p>