iOS: PDF Form filling

Is there some way that I can test the PDF Form editing feature?

It doesn't seems to work in your demo app.

yes, demo project for ios has no UI or APP layer implement.
just aviable in API.

Meaning I have to make it myself or ?

Do you got any examples/snippet how to do it in iOS?

Any hint where to start?

Before I buy the Premium license I have to make a proof of concept.

The scenario is:

An iPad app that can show a PDF and can do the following:

1. Form filling support for text fields and checkboxes.
2. Save the PDF and reopen it again for editing.
3. Flatten the PDF.
4. Mail the PDF.