App Architectures: Remixed (iOSCon 2018 edition)

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ed App Architectures @dcutting cutting.io Dan Cutting Schibsted

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¯\_(ツ)_/¯

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Marketplaces

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2015 2016 mid-2017 late-2017 Developers 0 3 6 9 12 Timeline

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–Uncle Bob “The goal of software architecture is to minimize the human resources required to build and maintain the required system” Clean Architecture

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MVC

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MVC MVVM VIPER

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MVC MVVM VIPER

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Our app

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Our app context • many markets • remixable features • remote teams • frequent releases

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Our app context • many markets • remixable features • remote teams • frequent releases ?

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break it down build it up

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Ad List VC Ad Detail VC Happy Buyer Team make browsing ads fun

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Ad Detail VC Ad Edit VC Ad List VC Glorious Seller Team Edit Gateway make selling stuﬀ easy

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Ad Detail VC Ad Edit VC Ad List VC Browse Flow Flow coordinators Edit Gateway

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Belarus App Browse Flow Ad Detail VC Ad List VC Custom views

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Browse Flow Ad Detail VC Ad Cards VC Custom views Mexico App

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“software components should be as small as possible but no smaller - Einstein?

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test (1, 2)

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End-to-end (E2E)

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Experience the app  just like a real user ✔ End-to-end (E2E)

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1. Slow, vague

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1. Slow, vague ✗

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1. Slow, vague ? ✗

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1. Slow, vague ? ? ✗

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1. Slow, vague ? ? ? ? ? ? ? ? ? ? ? ✗

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2. Insufﬁcient

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2. Insufﬁcient ✗

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E2E, huh! good god What is it good for?

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E2E, huh! good god What is it good for? • Quality Assurance (QA)?

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E2E, huh! good god What is it good for? • Quality Assurance (QA)? • Not good for baking in quality

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E2E, huh! good god What is it good for? • Quality Assurance (QA)? • Not good for baking in quality • Not good for assuring the product

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E2E, huh! good god What is it good for? • Quality Assurance (QA)? • Not good for baking in quality • Not good for assuring the product • OK for smoke tests

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E2E

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E2E Unit Tests

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Acceptance E2E Unit Tests

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100% of app User Web

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UIKit views/controllers Network gateway User Web 99% of app

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UIKit views/controllers Spies Network gateway Stubs 99% of app

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UIKit views/controllers Spies Network gateway Stubs 99% of app Acceptance tests & ﬁxtures

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View Controller Humble views

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View View Controller View Data Humble views

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View View Controller View Data Humble views

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View View Controller View Data Humble views

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View View Controller View Data View Spy Humble views

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View View Controller View Data View Spy Humble views (+ gateways)

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App Delegate Browse Flow Gateway List VC Detail VC Business logic Spies Stubs 99% of app

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Browse Flow Gateway Stub List Spy Detail Spy Business logic Spies Stubs 99% of app App Delegate

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Fixture Browse Flow Gateway Stub List Spy Detail Spy Business logic Spies Stubs 99% of app

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Fixture Browse Flow Gateway Stub List Spy Detail Spy UINavController UI ﬂow Spies Stubs Business logic Business logic

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UINavController Fixture Browse Flow Gateway Stub List Spy Detail Spy Navigator Fake UI ﬂow Spies Stubs Business logic Business logic

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UINavController Fixture Browse Flow Gateway Stub List Spy Detail Spy Navigator Fake No more UIKit! UI ﬂow Spies Stubs Business logic Business logic

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Loading Sirius  Canopus  Arcturus Could not  load star < Sirius < Brightest star  in the sky

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Loading Sirius  Canopus  Arcturus Could not  load star < Sirius < Brightest star  in the sky Demo

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break it down build it up

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ed App Architectures github.com/dcutting/Remix @dcutting cutting.io Dan Cutting Schibsted /paulstringer/OCSlimProject