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The Grand Tour of iOS Architectures Dan Cutting Schibsted cutting.io @dcutting

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The Grand Tour of iOS Architectures Dan Cutting Schibsted cutting.io @dcutting

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@dcutting

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@dcutting

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@dcutting MVC

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@dcutting

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@dcutting

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@dcutting ✓ Read/update views ✓ Convert taps into actions ✓ Decide when to route ✓ Present/dismiss screens ✓ Inject dependencies ✓ Feature logic ✓ Talk to external systems ✓ Parse data ✓ Read/update models ✓ Domain logic ✓ Format data for the view ✓ Respond to other VCs

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@dcutting ✓ Read/update views ✓ Convert taps into actions ✓ Decide when to route ✓ Present/dismiss screens ✓ Inject dependencies ✓ Feature logic ✓ Talk to external systems ✓ Parse data ✓ Read/update models ✓ Domain logic ✓ Format data for the view ✓ Respond to other VCs

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@dcutting Alex Proimos (CC BY-NC 2.0) https://www.flickr.com/photos/proimos/4199675334

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@dcutting Eutouring (CC BY-SA 4.0) https://commons.wikimedia.org/wiki/File:Flying_buttresses_of_the_Notre_Dame.jpg

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@dcutting Eutouring (CC BY-SA 4.0) https://commons.wikimedia.org/wiki/File:Flying_buttresses_of_the_Notre_Dame.jpg MVP

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@dcutting

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@dcutting

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@dcutting

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@dcutting Coordinator

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@dcutting override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "createLocation" { guard let creatorViewController = segue.destination as? CreatorViewController else { return } creatorViewController.delegate = self } }

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@dcutting

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@dcutting ✓ Read/update views ✓ Convert taps into actions ✓ Decide when to route ✓ Present/dismiss screens ✓ Inject dependencies ✓ Respond to other VCs ✓ Format data for the view ✓ Feature logic ✓ Domain logic ✓ Read/update models ✓ Talk to external systems ✓ Parse data

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@dcutting

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@dcutting

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@dcutting View Controllers ✓ Read/update views ✓ Convert taps into actions Presenters ✓ Decide when to route ✓ Respond to other modules ✓ Format data for the view Entities ✓ Domain logic Interactors ✓ Feature logic ✓ Read/update models Routers ✓ Present/dismiss screens ✓ Inject dependencies Gateways ✓ Talk to external systems ✓ Parse data

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@dcutting View Controllers ✓ Read/update views ✓ Convert taps into actions Presenters ✓ Decide when to route ✓ Respond to other modules ✓ Format data for the view Entities ✓ Domain logic Interactors ✓ Feature logic ✓ Read/update models Routers ✓ Present/dismiss screens ✓ Inject dependencies Gateways ✓ Talk to external systems ✓ Parse data

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@dcutting Robert C. Martin https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html

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@dcutting

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@dcutting

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@dcutting

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@dcutting

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@dcutting

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@dcutting

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@dcutting

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@dcutting

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@dcutting

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@dcutting 1. Testability

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@dcutting 1. Testability 2. A place for everything

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@dcutting 1. Testability 2. A place for everything 1. Philosophical disagreements

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@dcutting 1. Testability 2. A place for everything 1. Philosophical disagreements 2. Too much boilerplate

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@dcutting Lines of code 0 225 450 675 900 Number of types 0 3 6 9 12 15 18 MVC VIP

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@dcutting –Despondent respondent “It was terrible.”

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@dcutting Back home to Blighty

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@dcutting Back home to Blighty • Talk to your colleagues

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@dcutting Back home to Blighty • Talk to your colleagues • Piecemeal refactoring OK!

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@dcutting Back home to Blighty • Talk to your colleagues • Piecemeal refactoring OK! • Stop extracting when you’re happy with test coverage

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@dcutting Dan Cutting cutting.io @dcutting github.com/dcutting/GrandTour