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スケーラブル SwiftUI プロジェクトにおける実用的な TCA モジュラー化
- 1. スケーラブル SwiftUI プロジェクトのための 実⽤的な TCA 適用及びモジュール化 Principles of building robust module KyuYoung Heo @bbvch13531 iOS Developer
- 2. 目次 • デモ • Declarative UI and SwiftUI • The Composable Architecture • モジュラー化の目的 • ステップ 1: SwiftUI to TCA • ステップ 2: TCA モジュール化 • ステップ 3: Refactoring • 結論
- 3. デモを実行しましょう
- 4. Declarative UI and SwiftUI
- 5. struct CounterView: View { @State var count = 0 var body: some View { HStack { Button("-") { count -= 1 } Text("(count)") Button("+") { count += 1 } } } }
- 6. Data Flow in SwiftUI Declarative UI UI = f( state ) The layout on screen Builder methods The application state docs. fl utter.dev
- 7. Data Flow in SwiftUI Data fl ow Action View State 👨💻 User Interaction Render Update Mutate WWDC19: Data fl ow through SwiftUI
- 9. TCA • TCA は pointfree によって導入されます • Unidirectional data fl ow architecture • ex) elm, Redux, MVI, ReactorKit Introduction
- 11. TCA Architecture Diagram "タップ" Reducer State Action View Update Send Handle Store Increment Mutate
- 12. TCA Architecture Diagram Reducer State Action View Update Mutate Send Handle Store Increment count=0
- 16. TCA State Management Reducer State Action View Update Mutate Send Handle Store E ff ect Dependency
- 17. TCA • Better State Management • Easy to debug • Enhance Testability • Modularization(Composability) Bene fi ts
- 19. Modularization • The size of project grows, the complexity increases exponentially • Control this complexity is key of Software Engineering Purpose Feature Complexity Time Cost
- 20. • High Cohesion, Low Coupling • Open to Extend, Close to modify • Dependency Inversion • Testability Modularization SOLID Principle
- 21. Modularization • Composing Modules by Separating of Concerns • Do Use Access Control(public, internal, private) • Do access by protocol not by Implementation • Use Dependencies by DI • Write Unit Test Principles for Robust Module
- 22. Modularization • (Reducer + View) could be one component in TCA • Composing Reducers to build a App TCA
- 23. ステップ 1: SwiftUI to TCA
- 25. Workshop1 • Change ViewModel to Reducer • De fi ne State, Action • Handling Action • Implement GithubAPIClient SwiftUI to TCA
- 26. ステップ 2: TCA モジュラー化
- 27. Workshop2 • Add Local Swift Package • Create Modules according to Directories • Add Access Control (public, internal, private) • Inversion of Dependency TCA Modularization
- 30. Workshop3 • Inject Dependency using DI Container • Writing Unit Test Refactoring
- 31. 結 論 けつ ろん
- 32. Conclusion • Migrate SwiftUI to TCA • Seperate project into Modules • Inject Dependency • Writing Unit Test What we've done
- 33. Conclusion • How to compose module with high cohesion and low coupling What we've learn