Dependence day insurgence
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The state of the art about dependency injection with Swift for iOS and my personal advice on how to approach the problem.
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Dependence day insurgence
- 1. #Swift3Arch Dependence day: Insurgence Jorge D. Ortiz Fuentes @jdortiz
- 4. The Problem
- 5. #Swift3Arch Job Description Understand the problem Identify the right set of pieces Put proper names Make them run together properly
- 6. #Swift3Arch Social Network Option A Social Network
- 7. #Swift3Arch Video Text Image Social Network Option B User PostGroup Discussion Promotion DM
- 10. #Swift3Arch Making it work Objects require other objects to work -> Dependencies Each object creates its dependencies Bad idea™ • Another responsibility • What if we want to use it with different sets of pieces?
- 12. Test environment
- 14. But Who?
- 16. #Swift3Arch Inversion of Control Hollywood Principle
- 18. #Swift3Arch Dip Created by Olivier Halligon, maintained by Ilya Puchka Beautifully simple Nice way to inject in Storyboards Scopes, Named definitions, Runtime arguments, Circular dependencies, Auto-wiring & Auto-injection, Type forwarding, Storyboards integration, Weakly typed components, Easy configuration, Thread safety, Helpful error messages, and configuration validation.
- 19. #Swift3Arch Dip func configure(container: DependencyContainer) { container.register(.unique) { InMemoryRepo() } container.register(.unique) { try UseCaseFactory(entityGateway: container.resolve() as InMemoryRepo) } DependencyContainer.uiContainers = [showProgrammersListModule] } let showProgrammersListModule = DependencyContainer { container in container.register() { try ProgrammersListPresenter(useCaseFactory: container.resolve() as UseCaseFactory) } container.register(tag: "ProgrammersTableVC") { ProgrammersTableViewController() } .resolvingProperties { container, viewController in viewController.presenter = try container.resolve() as ProgrammersListPresenter } } extension ProgrammersTableViewController: StoryboardInstantiatable {}
- 20. #Swift3Arch Swinject Created by Jakub Vano, Wolfgang Lutz, Yoichi Tagala Pure Swift Type Support, Injection with Arguments, Initializer/Property/Method Injections, Initialization Callback, Circular Dependencies, Object Scopes, Reference & Value Types, Self-registration, Container Hierarchy, Property Injection from Resource files, Thread Safety, Modular Components, Storyboard
- 21. #Swift3Arch Cleanse Created by Square Early version, but promising
- 22. No Swift 3 Yet*!
- 24. #Swift3Arch Java for Android Standard annotations for DI (JSR330) Introspection & Reflection Many frameworks available Some owned by Google (Guice & Dagger 2)
- 25. Maturity
- 26. What then?
- 28. #Swift3Arch Assemble the Pieces class ProgrammersListConnector { // MARK: - Constants let entityGateway: EntityGatewayProtocol weak var presenter: ProgrammersListPresenter! func assembleModule(view: ProgrammersTableViewController) { let useCaseFactory = UseCaseFactory(entityGateway: entityGateway) let presenter = ProgrammersListPresenter(useCaseFactory: useCaseFactory) view.presenter = presenter view.connector = self presenter.view = view self.presenter = presenter } }
- 29. #Swift3Arch Factories are your friend protocol UseCase { func execute() } class UseCaseFactory { enum Use { case showProgrammersList(completion: ShowProgrammersListCompletion) // … } func create(useCase whichUseCase: Use) -> UseCase { switch whichUseCase { case let .showProgrammersList(completion: completion): return ShowProgrammersListUseCase(entityGateway: entityGateway, completionHandler: completion) // … } }
- 30. Recap
- 31. #Swift3Arch Take aways Make your dependencies explicit Use factories Understand how it a container works Use DI frameworks with caution
- 32. Thank You!