title: Create PDF Annotations in iOS
body: <p>I've been working on a pdf viewer with support for annotations and I need to be able to save new annotations that the user has created. I've seen tons of examples on how to draw text/lines/images, but that's only flattened content, I need to create actual annotation objects</p>
  
  <p>I've found no documentation or examples about it, so if anyone could point me in the right direction I would be extremely grateful</p>
  
  <p>Cheers!</p>
  
  <p>Edit: After several months of work we could release the v1 of this. We ended up using an open source c++ library, and went through a huge pain to make it compile for iOS. The one in charge of that isn't working in the company any more so we can't publish how we managed to do it</p>