TCAでViewStoreにKeyPath DynamicMemberLookupが使われてる件

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TCAͰViewStoreͷStateʹ KeyPath DynamicMemberLookup͕ɹ ࢖ΘΕͯΔ݅ @yimajo 2020/11/22 #fa_ios iOSΞϓϦ։ൃͷͨΊͷFunctional Architecture৘ใڞ༗ձ2

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TCA͸KeyPathʹΑΔ DynamicMemberLookup࢖ͬͯΜͷ͓΋͢ Εʔʂ ͜Ε͸͍͍ײ͡ͷ࢖͍ํ΍ʔ

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ຊ౰ʹͦ͏͔ʁ ඞવੑͷ͋Δ࢖͍ํ͔ʁ

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͍΍͍΍͍΍ɺ͍͍Ͱ͠ΐɻ Swift 4͘Β͍͔Βͷ KeyPath ɺ ͦͯ͠ Swift 4.2 ͔Βͷ Dynamic Member Lookupɺ ͜ΕΛ্ख͍͜ͱ૊Έ߹Θͤͨ Swift 5.1 ͔Βͷ Key Path ʹΑΔ Dynamic Member Lookup ΍Μɺ ͜ΕΛ࢖ͬͯΔͱؒ઀తʹͰ΋StateʹܕͰΞΫηε Ͱ͖ͯؾ࣋ͪ͑ʔΜ΍ɺͦΕҎ্ͷԿ͕͋Μͷ΍ʔʁ

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͜Ε͸ͩΊͩɺௐ΂ͯ ߟ͑௚ͯ͠ΈΑ͏͔…

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ࠓճͷ࿩ͷ֓ཁ

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ࠓճͷ࿩ͷ֓ཁ • TCAͰ͸KeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕࢖ΘΕ͍ͯΔ

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ࠓճͷ࿩ͷ֓ཁ • TCAͰ͸KeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕࢖ΘΕ͍ͯΔ • SwiftUI.View ͔Β State ͷ஋ΛݟΔͱ͖ͳͲ

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ࠓճͷ࿩ͷ֓ཁ • TCAͰ͸KeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕࢖ΘΕ͍ͯΔ • SwiftUI.View ͔Β State ͷ஋ΛݟΔͱ͖ͳͲ • ҙຯ͋Δͷʁ௕ॴ͸͋Δͷʁඞવੑ͸ʁ

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ࠓճͷ࿩ͷ֓ཁ • TCAͰ͸KeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕࢖ΘΕ͍ͯΔ • SwiftUI.View ͔Β State ͷ஋ΛݟΔͱ͖ͳͲ • ҙຯ͋Δͷʁ௕ॴ͸͋Δͷʁඞવੑ͸ʁ • ͜Ε͸ SwiftUI.View ͚ͩݟͯΔͱҙຯ΍ඞવੑ͸෼͔ΓͮΒ͍͔΋

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۩ମྫ

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TCA ͷ SwiftUI Χ΢ϯλʔαϯϓϧ

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TCA ͷ SwiftUI Χ΢ϯλʔαϯϓϧ

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TCA ͷ SwiftUI Χ΢ϯλʔαϯϓϧ • SwiftUI͕storeΛอ࣋

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TCA ͷ SwiftUI Χ΢ϯλʔαϯϓϧ • SwiftUI͕storeΛอ࣋ • store͔ΒviewStoreม਺औΓग़͠

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TCA ͷ SwiftUI Χ΢ϯλʔαϯϓϧ • SwiftUI͕storeΛอ࣋ • store͔ΒviewStoreม਺औΓग़͠ • viewStoreܦ༝ͰcountʹΞΫηε

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4XJGU6*7JFX 4UPSF4UBUF "DUJPO 4UBUF ViewStore

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bow-swift/bow-arch ൺֱͱͯ͠

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bow-swift/bow-arch ൺֱͱͯ͠

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bow-swift/bow-arch • SwiftUI.View͕stateͱhandleΛอ࣋ ൺֱͱͯ͠

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bow-swift/bow-arch • SwiftUI.View͕stateͱhandleΛอ࣋ • handle͕Stateͷૢ࡞ ൺֱͱͯ͠

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bow-swift/bow-arch • SwiftUI.View͕stateͱhandleΛอ࣋ • handle͕Stateͷૢ࡞ • ͍ΘΏΔReducer ൺֱͱͯ͠

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4XJGU6*7JFX 4UBUF )BOEMF

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࣮ࡍ TCA Ͱ KeyPath Member Lookup ͨ͘͠ͳΔؾ࣋ͪ΋෼͔Δ͕ ͳͯ͘΋ྑ͍ؾ΋͢Δ

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UIKitͰͷTCAͷ࢖͍ํΛݟͯΈΔ

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TCAͰUIKitͰͷ Χ΢ϯλʔαϯϓϧ … লུ

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TCAͰUIKitͰͷ Χ΢ϯλʔαϯϓϧ … লུ

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TCAͰUIKitͰͷ Χ΢ϯλʔαϯϓϧ • viewStore.publisher Ͱ $0.count … লུ

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TCAͰUIKitͰͷ Χ΢ϯλʔαϯϓϧ • viewStore.publisher Ͱ $0.count • ͦͷ஋ΛUITextLabelͷtextʹ … লུ

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TCAͰUIKitͰͷ Χ΢ϯλʔαϯϓϧ • viewStore.publisher Ͱ $0.count • ͦͷ஋ΛUITextLabelͷtextʹ … লུ ͭ·Γ State ͕ Publisher ͰऔಘͰ͖Δ

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ViewStoreΈͯΈΔ

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ViewStoreΈͯΈΔ • publisher: StorePublisher

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ViewStoreΈͯΈΔ • publisher: StorePublisher StorePublisher Λ ͞Βʹৄ͘͠஌Γ͍ͨ

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StorePublisherΈͯΈΔ

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StorePublisherΈͯΈΔ • StorePublisher͸Publisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ

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StorePublisherΈͯΈΔ • StorePublisher͸Publisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ

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StorePublisherΈͯΈΔ • StorePublisher͸Publisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ • ͞Βʹ subscript Ͱmapͯ͠Δ

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StorePublisherΈͯΈΔ • StorePublisher͸Publisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ • ͞Βʹ subscript Ͱmapͯ͠Δ ͭ·ΓɺStorePublisherʹରͯ͠΋ KeyPath Member Lookup ͯ͠ map ͠ Publisher Λฦͯ͠Δ

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→ self.viewStore.publisher.count .assign(to: \.text, on: countLabel) .store(in: &self.cancellables) ͭ·Γ …

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→ self.viewStore.publisher.count .assign(to: \.text, on: countLabel) .store(in: &self.cancellables) ࠨͷΑ͏ʹࣗલͰ .publisher ʹ .map Λॻ͔ͳ͍͍ͯ͘ʂ ͭ·Γ …

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→ self.viewStore.publisher.count .assign(to: \.text, on: countLabel) .store(in: &self.cancellables) ࠨͷΑ͏ʹࣗલͰ .publisher ʹ .map Λॻ͔ͳ͍͍ͯ͘ʂ KeyPath Member Lookup ࢖ͬͯলུͰ͖Δʢӈʣɻ ͭ·Γ …

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No content

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\\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏ม਺͸ݟ͑ͳͯ͘ྑͦ͞͏ ///

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↓ \\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏ม਺͸ݟ͑ͳͯ͘ྑͦ͞͏ ///

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↓ ετϦʔϜΛѻΘͣ State ͷϓϩύςΟ͕ཉ͍͠ͱ͖΋ɺ \\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏ม਺͸ݟ͑ͳͯ͘ྑͦ͞͏ ///

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↓ ετϦʔϜΛѻΘͣ State ͷϓϩύςΟ͕ཉ͍͠ͱ͖΋ɺ State ͱ͍͏ม਺͸ݟ͑ͳ͍΄͏͕ରশੑ͕͋Δ…͔΋… \\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏ม਺͸ݟ͑ͳͯ͘ྑͦ͞͏ ///

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7JFX4UPSF 4UBUF viewStore.count ͍ͩ͘͞ state.count: Int ฦ͢ viewStore.publisher.count ͍ͩ͘͞ StorePublisher͔Β StorePublisherͳ count ฦ͢ ϓϩύςΟͷ ஋͕ཉ͍͠ 1VCMJTIFSΛ TJOLͯ͠ Ͳ͏ʹ͔͍ͨ͠

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͓ΘΓʹ: ٞ࿦ͷϙΠϯτ • KeyPath Member Lookup ͳͯ͘΋ྑ͍ͱ͸ࢥ͏͚Ͳ΋ • Publisherͱͯ͠ཉ͍͠৔߹ͷΠϯλϑΣʔεͰ͸৑௕͞Λল͚ͯΔ • StateͷϓϩύςΟ͕΄͍͠ͱ͖΋ɺKeyPath Member LookupΛ ࢖ͬͨ΄͏͕ରশੑ΍౷Ұײ͕͋Δͷ͸෼͔Δ