We're designing a very long form in an iOS app.
Our first conclusion is that the form must be split into multiple pages, since follow-up questions depend on previous answers (see here: Long pages vs more pages).
Our second conclusion is that the next button must be both in the navbar and at the bottom of each page (see here: iOS multi-step form and user input validation).
So, our first question is: how many inputs should be presented on each page? E.g. some apps present only one input per view. And does this depend on categorisation of inputs? E.g. general personal information presented together.
Our second question is: what are the current different design paradigms for presenting the inputs, and which one is the most usable? E.g. table view in native calendar app, traditional inputs, etc.
Thanks for all your help.