A native app without server side. You must run it on iPad with landscape direction.
This app use Core Data save users info and products.
When into this app first, its Core Data will delete all products and save all products from JSON file.(If not do this, the data will be superimposed, get wrong result.)
In sign in and sign up case, use Core Data save users info.
But this app will not change JSON, because there is no server-side. This will cause if users bought some products, those products count will not change.
To see more details in source code.
