Lightweight Dependency Injection tips

https://potatotips.connpass.com/event/55019/

Transcript

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    ҙਤ͠ͳ͍༻్Ͱ࢖ΘΕͨ৔߹ʹɺͰ͖ΔݶΓ ίϯύΠϥΤϥʔΛग़͢ίʔυΛॻ͖͍ͨ
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18. ೉͍͜͠ͱ͸͍ͯ͠ͳͯ͘ɺ
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19. protocol DependencyInjectable { associatedtype Dependency static func make(withDependency dependency: Dependency) -> Self }
20. ࢖͍ํ
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21. final class WebViewController: UIViewController, DependencyInjectable { private var url: URL! typealias Dependency = URL static func make(withDependency dependency: Dependency) -> WebViewController { let vc = WebViewController.instantiateInitialViewController(with: "WebViewController") vc.url = dependency return vc } } ґଘ͢ΔΦϒδΣΫτͷఆٛ
22. final class WebViewController: UIViewController, DependencyInjectable { private var url: URL! typealias Dependency = URL static func make(withDependency dependency: Dependency) -> WebViewController { let vc = WebViewController.instantiateInitialViewController(with: "WebViewController") vc.url = dependency return vc } } %*ͳ7JFX$POUSPMMFSͷΠϯελϯε͸ɺ
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23. 4FHVFͷ৔߹
24. override func prepare(for segue: UIStoryboardSegue, sender: Any?) { switch segue.destination { case let vc as WebViewController: vc.url = url default: break } }  VSMΛ֎෦ʹެ։͢Δඞཁ͕͋Δ
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25. final class WebViewController: UIViewController, DependencyInjectable { private var url: URL! typealias Dependency = URL static func make(withDependency dependency: Dependency) -> WebViewController { let vc = WebViewController.instantiateInitialViewController(with: "WebViewController") vc.url = dependency return vc } }  VSMΛQSJWBUFʹͰ͖Δ
     ΠϯελϯεԽͷํ๏͕౷Ұ͞Ε͍ͯΔ͜ͱͰ%3:ݪଇΛकΕΔ
26. final class WebViewController: UIViewController, DependencyInjectable { private var url: URL! typealias Dependency = URL static func make(withDependency dependency: Dependency) -> WebViewController { let vc = WebViewController.instantiateInitialViewController(with: "WebViewController") vc.url = dependency return vc } } ͜Ε͚ͩݟΔͱ4FHVFͷํ͕ศརʹݟ͑Δ͕ɺ΋ͬͱෳࡶͳґଘੑ Λ஫ೖ͢Δඞཁ͕Ͱ͖ͨ৔߹ʹɺ4FHVFΛ࢖ͬͨํࣜ͸͔ͳΓ໘౗ ͳ͜ͱʹͳΔ
27. final class WebViewController: UIViewController, DependencyInjectable { private var url: URL! private var customUserAgent: String? struct Dependency { let url: URL let customUserAgent: String? } static func make(withDependency dependency: Dependency) -> WebViewController { let vc = WebViewController.instantiateInitialViewController(with: "WebViewController") vc.url = dependency.url vc.customUserAgent = dependency.customUserAgent return vc } } ྫͱͯ͠͸ɺ8FC7JFXʹઃఆ͢ΔDVTUPN6TF"HFOUΛมߋ͢Δඞཁ ͕͋Δ৔߹ɺ͜ͷΑ͏ʹ%FQFOEFODZ
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28. ࢖͍ํ
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29. let vc = WebViewController.make(withDependency: url) navigationController?.pushViewController(vc, animated: true)
30. let vc = WebViewController.make(withDependency: url) navigationController?.pushViewController(vc, animated: true)
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32. extension UIViewController { func present<DI: DependencyInjectable>(viewControllerType: DI.Type, dependency: DI.Dependency, withNavigationType navigationType: UINavigationController.Type? = nil, animated: Bool = true, completion: (() -> Swift.Void)? = nil) where DI: UIViewController { let vc = viewControllerType.make(withDependency: dependency) if let navigationType = navigationType { let nav = navigationType.init(rootViewController: vc) present(nav, animated: animated, completion: completion) } else { present(vc, animated: animated, completion: completion) } } func push<DI: DependencyInjectable>(viewControllerType: DI.Type, dependency: DI.Dependency, animated: Bool = true) where DI: UIViewController { let vc = viewControllerType.make(withDependency: dependency) navigationController?.pushViewController(vc, animated: animated) } } %FQFOEFODZ*OKFDUBCMFΛ࢖ͬͯભҠ࣌ͷίʔυΛந৅Խ
33. push(viewControllerType: WebViewController.self, dependency: url) present(viewControllerType: WebViewController.self, dependency: url, withNavigationType: CustomNavigationController.self) %FQFOEFODZ*OKFDUBCMFϓϩτίϧͷந৅Խͷ͓ӄͰɺ
    ͜Μͳײ͡Ͱָʹॻ͚ΔΑ͏ʹͳͬͨʂ
34. push(viewControllerType: WebViewController.self, dependency: url) present(viewControllerType: WebViewController.self, dependency: url, withNavigationType: CustomNavigationController.self) ͍͖ͳΓ͜͜ʹͨͲΓண͍ͨΘ͚Ͱ͸ͳ͘ɺϦϑΝΫλϦϯάΛ ܁Γฦ͍ͯ͘͠தͰ͍·ͷܗʹͳ͍ͬͯͬͨ
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