potatotips #50: iOSは自動生成の夢を見るか？

https://potatotips.connpass.com/event/82476/

Transcript

1. iOS͸ࣗಈੜ੒ͷເΛ
   ݟΔ͔ʁ
   
   5BLFTIJ*IBSB
   QPUBUPUJQT
   

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2. ࣗݾ঺հ
   • Takeshi Ihara
   • Recruit Marketing Partners
   • iOS Engineer
   • Twitter: @nonchalant0303
   • GitHub: Nonchalant
   

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3. Dependency Injection (DI)
   

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4. DI Library
   • DIKit
   • Swinject
   • Typhoon
   • Cleanse
   

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5. Swinject
   https://github.com/Swinject/Swinject
   • Swinject helps your app split into loosely-
   coupled components, which can be
   developed, tested and maintained more
   easily
   • Swinject is powered by the Swift generic type
   system and first class functions to define
   dependencies of your app simply and fluently
   

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6. protocol UseCase {}
   struct UseCaseImpl: UseCase {}
   let container = Container()
   container.register(UseCase.self) { _ in
   UseCaseImpl()
   }
   let useCase =
   container.resolve(UseCase.self)!
   

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7. container.register(A_UseCase.self) { r in
   A_UseCaseImpl(repository: r.resolve(A_Repository.self)!)
   }
   container.register(A_Repository.self) { r in
   A_RepositoryImpl(dataStore: r.resolve(A_DataStore.self)!)
   }
   container.register(A_DataStore.self) { _ in
   A_DataStoreImpl()
   }
   …
   container.register(Z_DataStore.self) { _ in
   Z_DataStoreImpl()
   }
   

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8. container.register(A_UseCase.self) { r in
   A_UseCaseImpl(repository: r.resolve(A_Repository.self)!)
   }
   // container.register(A_Repository.self) { r in
   // A_RepositoryImpl(dataStore: r.resolve(A_DataStore.self)!)
   // }
   container.register(A_DataStore.self) { _ in
   A_DataStoreImpl()
   }
   …
   container.register(Z_DataStore.self) { _ in
   Z_DataStoreImpl()
   }
   ಈత%*ͳͷͰࢀর͞ΕΔ·Ͱؾ͚ͮͳ͍ʂ
   

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9. Sourcery
   https://github.com/krzysztofzablocki/Sourcery
   • Sourcery is a code generator for Swift
   language, built on top of Apple's own
   SourceKit
   • It extends the language abstractions to allow
   you to generate boilerplate code
   automatically
   • It uses Stencil as template language
   

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10. struct UseCaseDependencyInjector: DependencyInjector {
    func inject(container: Container) {
    {% for interface in types.protocols where interface.name|hasSuffix:"UseCase" %}
    {% for implement in types.all where implement.name|hasPrefix:interface.name %}
    container.register({{ interface.name }}.self) { r in
    {{ implement.name }}(
    {% for parameter in implement.initializers.first.parameters %}
    {{ parameter.name }}: r.resolve({{ parameter.typeName }}.self)!
    {% endfor %}
    )
    }
    {% endfor %}
    {% endfor %}
    }
    }
    

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11. // SourceryͷΠϯετʔϧ
    brew install sourcery
    // ϑΝΠϧੜ੒
    sourcery \
    —sources Project/UseCase \
    —templates UseCase.stencil \
    —output .
    

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12. struct UseCaseDependencyInjector: DependencyInjector {
    func inject(container: Container) {
    container.register(A_UseCase.self) { _ in
    A_UseCaseImpl()
    }
    container.register(B_UseCase.self) { r in
    B_UseCaseImpl(
    repository: r.resolve(B_Repository.self)!
    )
    }
    …
    container.register(Z_UseCase.self) { r in
    Z_UseCaseImpl(
    repository: r.resolve(Z_Repository.self)!
    )
    }
    }
    }
    

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13. Summary
    • ϘΠϥʔϓϨʔτίʔυ͸ΨϯΨϯࣗಈੜ੒͠Α͏ʂ
    • ໋໊نଇΛ͔ͳΓར༻͚ͨ͠ͲɺSourcery͸͋Δ
    Protocolʹద߹͍ͯ͠Δܕ͚ͩΛநग़Ͱ͖ΔͷͰ
    Interface, ImplementsͰPrefix͕ͣΕͯͯ΋େৎ෉ͳ͸
    ͣʂ
    • Sourceryʹ͓͚ΔStencilͷจ๏͸ https://github.com/
    SwiftGen/StencilSwiftKit ʹ͋Γ·͢ʂ
    

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