Clean Swift Monthly Roundup - February 2018

These are the topics covered in this issue:

• How much abstraction should you introduce at a boundary between two components?
  
• How to decide what to write unit tests for?
  
• API worker design
  
• Routing and UITabBarController
  
• My general approach to routing
  
• Threading
  
• Dependency injection by extension
  
• Dependency injection by protocol
  
• Container view controller
  
• My usual workflow to implement a feature
  
• Which protocol should you declare your data in?
  
• The role of the presenter
  
• More Core Data goodness
  
• Realm sample app with some refactoring techniques