Implementation of Clean Architecture using FRP

Talk by Daria Kovalenko

Даша расскажет о реализации принципов Clean Architecture с использованием FRP (RxSwift).
Что будет:
- решение типовых задач и проблем
- лайфхаки и операторы
Чего не будет:
- унылой теории

This talk was made for CocoaFriday #4 ( https://cocoaheads.org.ua/cocoafriday/4) which took place Jun 14, 2019

Video: https://youtu.be/bTwvSDZhs3I

Transcript

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

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2. View
   

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

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4. Store
   

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

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

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7. Page
   

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8. 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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9. Store
   Page
   View
   Dependency rule
   

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

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12. How it works?
    

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13. Store extension example
    

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14. Store
    

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15. Base pages
    

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20. Bind with RxSwift
    

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21. Bind operator ||>
    

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22. Bind operator <||>
    

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23. Before:
    After:
    

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24. Navigation
    

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25. UIViewController Page
    User action
    

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26. UIViewController Page
    User action
    Next Page
    Controller Navigator
    

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27. UIViewController Page
    User action
    Next Page
    Controller Navigator
    Router
    Next Page
    

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

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

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30. Router (first vision)
    

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31. Protocols for binding page and UIViewControllers
    

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32. Controller creation
    

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34. 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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35. Questions
    

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