I'm working on a iOS app and I would like to build something like I saw on the Facebook Paper. Here attached some design of what I want to achieve. Basically, in the upper half of the screen I have a paging. In the lower half, I would like to have another paging that corresponds to the page in the upper side. So, when I scroll the upper side page I want to change the pages on the lower side. So for each upper page I have several lower pages (not the same number of sub pages for each page).
Any idea how to achieve that ? I'm thinking of using a UICollectionView but is this the best solution? If so, how to build the lower paging system?
Thanks for any idea.