SwiftUIにおける依存性逆転原則の戦略 / A strategy to import Dependency-Inversion-Principle in SwiftUI apps

Transcript

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2. } var employedBy = "YUMEMI Inc." var job = "iOS Tech Lead" var favoriteLanguage = "Swift" var twitter = "@lovee" var qiita = "lovee" var github = "el-hoshino" var additionalInfo = """ ݘ೿ͳͷʹೣΛอޢͯ͠͠·ͬͨ """ final class Me: Developable, Talkable {
4. struct LandmarkList: View { @EnvironmentObject var modelData: ModelData @State private var showFavoritesOnly = false var body: some View { // ... } } IUUQTEFWFMPQFSBQQMFDPNUVUPSJBMTTXJGUVJ
5. final class ModelData: ObservableObject { @Published var landmarks: [Landmark] = [ // ... ] } IUUQTEFWFMPQFSBQQMFDPNUVUPSJBMTTXJGUVJ
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8. ͳͥ۩৅ʹґଘ͢Δͷ͸ѱ͍จ໌͔ final class SomeComponent { var p: Int = 0 func f() {} // ... } final class SomeObject { let component: SomeComponent init(component: SomeComponent) { self.component = component } func doSomething() { component.f() } } func test_doSomething() { final class MockComponent: SomeComponent { override init() { super.init() self.p = 100 } override func f() {} } let object = SomeObject(component: MockComponent()) object.doSomething() } Inheritance from a final class 'SomeComponent' Instance method overrides a 'final' instance method
9. ͳͥ۩৅ʹґଘ͢Δͷ͸ѱ͍จ໌͔ class SomeComponent { var p: Int = 0 func f() {} // ... } final class SomeObject { let component: SomeComponent init(component: SomeComponent) { self.component = component } func doSomething() { component.f() } } func test_doSomething() { final class MockComponent: SomeComponent { override init() { super.init() self.p = 100 } override func f() {} } let object = SomeObject(component: MockComponent()) object.doSomething() } pOBM
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12. ͳͥ۩৅ʹґଘ͢Δͷ͸ѱ͍จ໌͔ class SomeComponent { func a() {} func b() {} } final class ObjectA { let component: SomeComponent func doSomething() { component.a() } } final class ObjectB { } func test_doSomethingA() { final class MockComponent: SomeComponent { override func a() { // } override func b() { XCTFai() } } let object = ObjectA(component: MockComponent()) object.doSomething() } B
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17. Ԡ༻ͯ͠ΈΔͱ protocol ComponentProtocol { func f() } final class SomeObject { let component: ComponentProtocol init(component: ComponentProtocol) { self.component = component } func doSomething() { component.f() } } final class SomeComponent { var p: Int = 0 } extension SomeComponent: ComponentProtocol { func f() {} }
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27. ํ๏
    ɿδΣωϦΫεΛ࢖͏ protocol SomeObject: ObservableObject { var int: Int { get } } struct MyView<Object: SomeObject>: View { @StateObject var object: Object var body: some View { Text("\(object.int)") } } final class Counter: SomeObject { @Published var int = 0 } δΣωϦΫεΛೖΕͯ͋͛Ε͹
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29. ํ๏
    ɿδΣωϦΫεΛ࢖͏ protocol SomeObject: ObservableObject { var int: Int { get } } struct MyView<Object: SomeObject>: View { @EnvironmentObject var object: Object var body: some View { Text("\(object.int)") } } final class Counter: SomeObject { @Published var int = 0 } return MyView<Counter>() 4UBUF0CKFDU
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35. ํ๏
    ɿܕফڈΛ࢖͏ protocol SomeObject: ObservableObject { var int: Int { get } } struct MyView: View { @EnvironmentObject var object: AnySomeObject var body: some View { Text("\(object.int)") } } final class Counter: SomeObject { @Published var int = 0 } return MyView() δΣωϦοΫܕ͕ͳ͘ͳͬͯεοΩϦ ܕফڈͨ͠ܕΛ࢖͏ͷͰ
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39. ํ๏
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40. ํ๏
    ɿܕফڈΛ࢖͏ final class AnySomeObject: SomeObject { private let object: SomeObjectBox fileprivate init<O: SomeObject>(_ object: O) where O.ObjectWillChangePublisher == ObservableObjectPublisher { self.object = AnySomeObjectBox(object) } var int: Int { return object.int } var objectWillChange: ObservableObjectPublisher { return object.objectWillChange } } 4UFQ
    
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41. ํ๏
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42. ํ๏
    ɿܕফڈΛ࢖͏ protocol SomeObject: ObservableObject { var int: Int { get } } struct MyView: View { @EnvironmentObject var object: AnySomeObject var body: some View { Text("\(object.int)") } } final class Counter: SomeObject { @Published var int = 0 } return MyView()
43. ํ๏
    ɿܕফڈΛ࢖͏ protocol SomeObject: ObservableObject { var int: Int { get } } struct MyView: View { @EnvironmentObject var object: AnySomeObject var body: some View { Text("\(object.int)") } } final class Counter: SomeObject { @Published var int = 0 } return MyView() .environmentObject(Counter().eraseToAnySomeObject()) &OWJSPONFOU0CKFDU
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46. ͜ͷΑ͏ʹ
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