Clean Swift Monthly Roundup - October 2018

These are the topics covered in this issue:

• Three approaches to mocking a class for your unit tests
  
• Managing synchronous, asynchronous, and changing states
  
• Should you keep the interactor purely for business logic without any UIKit knowledge?
  
• Should you have logic in addition to data in your request, response, and view model structs?
  
• How does Clean Swift's VIP cycle map to Uncle Bob's original Clean Architecture?
  
• Stubbing out the notification center dependency in your tests
  
• Understanding the many different _APIs_ in an iOS app
  
• Code review this `FolderPicker` project
  
• Code review this `APIClient.swift` gist