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00CHALLENGES
CAN WE FIND AN ARCHITECTURE THAT IS:
• maintanable and testable
• handles Apple’s MVC problem
• can be adopted by our entire iOS team
• plays well with Swift
MVC
MVC BY APPLE
MVP
MVVM
VIPER
01VIPER COMPONENTS
VIPER
• Router, Entity, Presenter, Interactor, View
• good separation of concerns
• responsibilities can be grouped into two categories: when to
do something and how to do something
WIREFRAME (ROUTER)
WIREFRAME (ROUTER)
• knows how to navigate
WIREFRAME (ROUTER)
• knows how to navigate
• knows how to setup module components
PRESENTER
PRESENTER
• knows when to navigate
PRESENTER
• knows when to navigate
• knows when to fetch data
PRESENTER
• knows when to navigate
• knows when to fetch data
• knows when to present data
VIEW
VIEW
• knows how to present data
VIEW
• knows how to present data
• knows how to delegate user interactions
INTERACTOR
INTERACTOR
• knows how to fetch and prepare data
ENTITY
• knows how to hold data (actually is data)
WHEN AND HOW RESPONSIBILITIES
• roughly put, when is the gist of the application business logic, and how is
most often implementation details
WHEN AND HOW RESPONSIBILITIES
• roughly put, when is the gist of the application business logic, and how is
most often implementation details
• this means presenters define most of your apps behaviour
WHEN AND HOW RESPONSIBILITIES
• roughly put, when is the gist of the application business logic, and how is
most often implementation details
• this means presenters define most of your apps behaviour
• interactos define business data logic (enterprise business logic)
02TAILORING VIPER
CLEANLINESS IS NEXT TO GODLINESS…
…A LITTLE DIRT GOES A LONG WAY.
MODULE LIFECYCLE
• wireframe → presenter →view
• view → presenter → wireframe
THE ‘I’ IN VIPER IS COOL AND ALL, BUT…
• ditch the interactors if they’re giving you too much trouble
and communicate directlly with an APIHandler/services/…
• work with instances and not classes for networking to ease
mocking
03COMMUNICATION
WIREFRAME & PRESENTER
PRESENTER & VIEW
PRESENTER & INTERACTOR
04TOOLS
TOOLS
• project generator
• module generator
VEKI SAYS: “YOU’RE WELCOME.”
05ISSUES
• method proxying
• data passing between modules
• storyboards
• child view controllers
COMMON ISSUES
THINGS THAT BIT US IN THE ASS
• one wireframe for multiple screens (modules)
• wireframe → presenter →view
• protocol hell
• retain cycles
06CONCLUSION
NO SILVER BULLET… …NO S*** SHERLOCK!
USE REASON AND AVOID EARLY OPTIMISATION AND OVER-ENGENEERING.
A LOT OF GOOD READS
• http://mutualmobile.github.io/blog/2013/12/04/viper-
introduction/
• https://medium.com/ios-os-x-development/ios-
architecture-patterns-ecba4c38de52#.kxg3vn6lm
• https://www.objc.io/issues/13-architecture/viper/
• https://swifting.io/blog/2016/03/07/8-viper-to-be-
or-not-to-be/
• http://blog.soat.fr/2015/09/developper-en-ios-allegez-
vos-uiviewcontrollers-soc-separation-of-concerns/
• https://github.com/thoughtbot/liftoff
07Q&A
