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VIPER, PATTERNS & FRAMEWORKS Sonam Dhingra Software Engineer [email protected] | @sdhingra89 September 6, 2017

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Hi, we’re ustwo

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INNOVATIVE CLIENT WORK AWARD-WINNING OWN PRODUCTS AND GAMES LAUNCHING NEW VENTURES

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GAME PLAN 1 2 3 4 Introduction Choosing a Pattern Viper Implementation

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WHY CARE Design pattern knowledge Cocoa API knowledge Structuring code to fit design Not recommending Viper for everything

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GOAL By the end of this talk you will have an understanding of the Viper design pattern & how to apply it to your application or framework.

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LET’S BEGIN

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MVC MVVM VIPER THE PATTERNS US IOS PEEPS TALK ABOUT...

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VIPER View Interactor Presenter Entity Router

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VIPER View Interactor Presenter Entity Router Interface layer, sets up layout of view, updates images and labels ...etc Business logic, manipulation of data, transformation of models, Interacts with API Services, Data Managers and passes results to presenter Formats data for the view, receives input from view, Passes it to the interactor. A simple data representing what is needed for the VIPER Module to function An object responsible for module navigation And application navigation

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VIPER STANDARD VIEW ROUTER INTERACTOR Input Output Input Output PRESENTER ENTITY VIEWCONTROLLER

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View Interactor Presenter Entity Router VIPER + FRAMEWORK CONTRACT BUILDER

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VIPER + FRAMEWORK VIEW CONTRACT INTERACTOR Input Output Input Output PRESENTER BUILDER VIEWCONTROLLER ENTITY View Passes an entity to the builder, and the builder creates the interactor, presenter. Ultimately passes the view back to the view controller

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ABSTRACTION COOL WHAT? BUT NOW

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USER STORY CONTROL A VIDEO

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Actions Action Action SO MANY INTERACTIONS !!!!!!!!

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SAMPLE FRAMEWORK: VIDEO PLAYBACK KIT https://github.com/ustwo/videoplayback-ios

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VIPER & AVKIT, AVFOUNDATION VIEW INTERACTOR AVPLAYER PLAYER didTapPlay didTapPlay onPlaySuccess(playerLayer) PRESENTER didTapPlay PLAYER MANAGER - KVO - STATE ENTITY

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WHY VIPER Protocol oriented Testable Single Responsibility Principle Reusable

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Sonam Dhingra Software Engineer [email protected] | @sdhingra89 THANKS