Switching iCloud account within an app

Question

Does anyone know, if the iCloud account can be also switched within the application (without changing the iCloud account under the Settings)?

So let's say I have one device (A), which may be shared among N users (the users will have to authenticate before they can access the applications features), I also want their data to be backed up so they could be synced to another device (B).

Can this be accomplished using Apples's iCloud services or is a 3rd party provider the only solution in this case?

Answer 1

No. Apple gives you no control over logging in and out of iCloud. That is completely handled by the Settings app and Apple's own frameworks.