Viewing Retailers Catalogues

We need an application for iphone/ipad in swift that shows some catalogues, like « bonial ». The application is simple, it has 3 levels. First level : shows categories of retailers Second level : shows retailers Third level : shows the catalogue of the retails (as viewpager) In this third level : there must be some functionnalites : • sharing a page of the catalogue • adding a page to favorites • cropping a part of the page and storing it An api is ready to communicate with it, and retrieve data from server There are 7 views in total in the application, most of them are the same (grids with the same style)