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iOSࣗಈੜͷເΛ
ݟΔ͔ʁ
5BLFTIJ*IBSB
QPUBUPUJQT
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ࣗݾհ
• Takeshi Ihara
• Recruit Marketing Partners
• iOS Engineer
• Twitter: @nonchalant0303
• GitHub: Nonchalant
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Dependency Injection (DI)
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DI Library
• DIKit
• Swinject
• Typhoon
• Cleanse
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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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protocol UseCase {}
struct UseCaseImpl: UseCase {}
let container = Container()
container.register(UseCase.self) { _ in
UseCaseImpl()
}
let useCase =
container.resolve(UseCase.self)!
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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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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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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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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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// SourceryͷΠϯετʔϧ
brew install sourcery
// ϑΝΠϧੜ
sourcery \
—sources Project/UseCase \
—templates UseCase.stencil \
—output .
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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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Summary
• ϘΠϥʔϓϨʔτίʔυΨϯΨϯࣗಈੜ͠Α͏ʂ
• ໋໊نଇΛ͔ͳΓར༻͚ͨ͠ͲɺSourcery͋Δ
Protocolʹద߹͍ͯ͠Δܕ͚ͩΛநग़Ͱ͖ΔͷͰ
Interface, ImplementsͰPrefix͕ͣΕͯͯେৎͳ
ͣʂ
• Sourceryʹ͓͚ΔStencilͷจ๏ https://github.com/
SwiftGen/StencilSwiftKit ʹ͋Γ·͢ʂ