Rewrite an iPhone application Duplicity - Double ACAAN

I wrote the following application: [login to view URL] It is written in obj-c and html/javascript view embedded in a WebView. It's pretty old and I want it to be rewritten using modern Objective-C or Swift. It has to be compatible with all iPhone form factors 4s, 5, 6 and 6plus. I want to remove the WebView and write all the application in native code. The application it's fairly simple in itself, it has the following elements: - menù option to create drawings with fingers or pen, I want this view to be rewritten or to use a better software to simulate more fluid drawings. This has to be very basic drawing application simulating a black pen on a white paper. This has to support all form factors. - menù to show application help page (crucial because the trick is explained here). This is a single HTML page and I want suggestions from you to verify the readability, if it is needed to expose a PDF instead of HTML or rewrite the help in native views. - menù option to load the WebView (about 200 hundred of javascript code) that helps the magician to do the magic trick. I want this to be rewritten in native code and support all iphone form factors. Applicants have to sign a non-disclosure agreement before viewing the original code (on a private assembla repository) because the code contains registered algorithms.