Tiago Braga

So basically, the former part (UIKit stuff) will remain, as it should, in the view controller. Everything else, all of app specific business logic, will now be in the ViewModel.

… UIKit/UIViewController specific methods and everything that deals directly with views and subviews. And on the the other side put everything else, all of your business logic; i.e. network requests, validation, preparing model data for presentation, etc…

API request is made by the view model thereby conserving view models responsibility to perform the business logic.