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Implementation of Clean Architecture using FRP Daria Kovalenko iOS Developer at Anadea

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View

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View - UIKit (UIViewController, UIView) - layouts - animations - user’s actions

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Store

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Store Store Rest Services DAOs Local storage Profile Store Order Store Contacts Store

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Store - fetches data from network - stores data in local storage - updates data - creates/deletes stores - switches to other stores

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Page

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Page - fetches data from store - transforms store data for presentation - transforms store data to subpages - sends updates to store - owns store - generates other pages

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Store Page View Dependency rule

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Why RxSwift? Store: Observable Page: Observable, BehaviorSubject (PublishRelay, BehaviorRelay), Action View: RxCocoa extensions, RxDataSources etc

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How it works?

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Store extension example

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Store

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Base pages

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Bind with RxSwift

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Bind operator ||>

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Bind operator <||>

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Before: After:

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Navigation

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UIViewController Page User action

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UIViewController Page User action Next Page Controller Navigator

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UIViewController Page User action Next Page Controller Navigator Router Next Page

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UIViewController Page User action Next Page Controller Navigator Creates next UIViewController Router Next Page

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UIViewController Page User action Next Page Controller Navigator Creates next UIViewController Router Next Page Presents next UIViewController

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Router (first vision)

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Protocols for binding page and UIViewControllers

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Controller creation

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Conclusions - independent layers - changes of store does not change UI and vice versa - different ViewControllers can be built in different ways (storyboards, nibs, pin layouts etc) - UI components can be wrapped to RxCocoa and easy binded - needs extra input/output models between layers - need to handle side effects of bindings - control disposeBag for binding on different type of UI - UITableViewCells, subviews to avoid multiple bindings

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Questions