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TCAでViewStoreにKeyPath DynamicMemberLookupが使われてる件
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yimajo
November 22, 2020
Programming
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1.1k
TCAでViewStoreにKeyPath DynamicMemberLookupが使われてる件
iOSアプリ開発のためのFunctional Architecture情報共有会2 の発表資料です。
https://connpass.com/event/194239/
yimajo
November 22, 2020
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Transcript
TCAͰViewStoreͷStateʹ KeyPath DynamicMemberLookup͕ɹ ΘΕͯΔ݅ @yimajo 2020/11/22 #fa_ios iOSΞϓϦ։ൃͷͨΊͷFunctional Architectureใڞ༗ձ2
TCAKeyPathʹΑΔ DynamicMemberLookupͬͯΜͷ͓͢ Εʔʂ ͜Ε͍͍ײ͡ͷ͍ํʔ
ຊʹͦ͏͔ʁ ඞવੑͷ͋Δ͍ํ͔ʁ
͍͍͍ɺ͍͍Ͱ͠ΐɻ Swift 4͘Β͍͔Βͷ KeyPath ɺ ͦͯ͠ Swift 4.2 ͔Βͷ Dynamic
Member Lookupɺ ͜ΕΛ্ख͍͜ͱΈ߹Θͤͨ Swift 5.1 ͔Βͷ Key Path ʹΑΔ Dynamic Member Lookup Μɺ ͜ΕΛͬͯΔͱؒతʹͰStateʹܕͰΞΫηε Ͱ͖ͯؾ࣋ͪ͑ʔΜɺͦΕҎ্ͷԿ͕͋Μͷʔʁ
͜ΕͩΊͩɺௐͯ ߟ͑ͯ͠ΈΑ͏͔…
ࠓճͷͷ֓ཁ
ࠓճͷͷ֓ཁ • TCAͰKeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕ΘΕ͍ͯΔ
ࠓճͷͷ֓ཁ • TCAͰKeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕ΘΕ͍ͯΔ •
SwiftUI.View ͔Β State ͷΛݟΔͱ͖ͳͲ
ࠓճͷͷ֓ཁ • TCAͰKeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕ΘΕ͍ͯΔ •
SwiftUI.View ͔Β State ͷΛݟΔͱ͖ͳͲ • ҙຯ͋Δͷʁॴ͋Δͷʁඞવੑʁ
ࠓճͷͷ֓ཁ • TCAͰKeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕ΘΕ͍ͯΔ •
SwiftUI.View ͔Β State ͷΛݟΔͱ͖ͳͲ • ҙຯ͋Δͷʁॴ͋Δͷʁඞવੑʁ • ͜Ε SwiftUI.View ͚ͩݟͯΔͱҙຯඞવੑ͔ΓͮΒ͍͔
ࠓճͷͷ֓ཁ • TCAͰKeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕ΘΕ͍ͯΔ •
SwiftUI.View ͔Β State ͷΛݟΔͱ͖ͳͲ • ҙຯ͋Δͷʁॴ͋Δͷʁඞવੑʁ • ͜Ε SwiftUI.View ͚ͩݟͯΔͱҙຯඞવੑ͔ΓͮΒ͍͔ • TCAͰͳ͍ઃܭҰԠৼΓฦΔ
ࠓճͷͷ֓ཁ • TCAͰKeyPathʹΑΔDynamic Member LookupʢҎ߱ KeyPath Member Lookupʣ ͕ΘΕ͍ͯΔ •
SwiftUI.View ͔Β State ͷΛݟΔͱ͖ͳͲ • ҙຯ͋Δͷʁॴ͋Δͷʁඞવੑʁ • ͜Ε SwiftUI.View ͚ͩݟͯΔͱҙຯඞવੑ͔ΓͮΒ͍͔ • TCAͰͳ͍ઃܭҰԠৼΓฦΔ • UIKit ͔Β͏߹ΛͬͯΔͱඞવੑ͕͋ΔΑ͏ʹࢥ͑Δ
۩ମྫ
TCA ͷ SwiftUI Χϯλʔαϯϓϧ
TCA ͷ SwiftUI Χϯλʔαϯϓϧ
TCA ͷ SwiftUI Χϯλʔαϯϓϧ • SwiftUI͕storeΛอ࣋
TCA ͷ SwiftUI Χϯλʔαϯϓϧ • SwiftUI͕storeΛอ࣋ • store͔ΒviewStoreมऔΓग़͠
TCA ͷ SwiftUI Χϯλʔαϯϓϧ • SwiftUI͕storeΛอ࣋ • store͔ΒviewStoreมऔΓग़͠ • viewStoreܦ༝ͰcountʹΞΫηε
4XJGU6*7JFX 4UPSF4UBUF "DUJPO 4UBUF ViewStore
bow-swift/bow-arch ൺֱͱͯ͠
bow-swift/bow-arch ൺֱͱͯ͠
bow-swift/bow-arch • SwiftUI.View͕stateͱhandleΛอ࣋ ൺֱͱͯ͠
bow-swift/bow-arch • SwiftUI.View͕stateͱhandleΛอ࣋ • handle͕Stateͷૢ࡞ ൺֱͱͯ͠
bow-swift/bow-arch • SwiftUI.View͕stateͱhandleΛอ࣋ • handle͕Stateͷૢ࡞ • ͍ΘΏΔReducer ൺֱͱͯ͠
4XJGU6*7JFX 4UBUF )BOEMF
࣮ࡍ TCA Ͱ KeyPath Member Lookup ͨ͘͠ͳΔؾ͔࣋ͪΔ͕ ͳͯ͘ྑ͍ؾ͢Δ
UIKitͰͷTCAͷ͍ํΛݟͯΈΔ
TCAͰUIKitͰͷ Χϯλʔαϯϓϧ … লུ
TCAͰUIKitͰͷ Χϯλʔαϯϓϧ … লུ
TCAͰUIKitͰͷ Χϯλʔαϯϓϧ • viewStore.publisher Ͱ $0.count … লུ
TCAͰUIKitͰͷ Χϯλʔαϯϓϧ • viewStore.publisher Ͱ $0.count • ͦͷΛUITextLabelͷtextʹ … লུ
TCAͰUIKitͰͷ Χϯλʔαϯϓϧ • viewStore.publisher Ͱ $0.count • ͦͷΛUITextLabelͷtextʹ … লུ
ͭ·Γ State ͕ Publisher ͰऔಘͰ͖Δ
ViewStoreΈͯΈΔ
ViewStoreΈͯΈΔ • publisher: StorePublisher<State>
ViewStoreΈͯΈΔ • publisher: StorePublisher<State> StorePublisher Λ ͞Βʹৄ͘͠Γ͍ͨ
StorePublisherΈͯΈΔ
StorePublisherΈͯΈΔ • StorePublisherPublisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ
StorePublisherΈͯΈΔ • StorePublisherPublisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ
StorePublisherΈͯΈΔ • StorePublisherPublisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ • ͞Βʹ subscript Ͱmapͯ͠Δ
StorePublisherΈͯΈΔ • StorePublisherPublisherʹ४ڌͯ͠ ͍ΔͷͰStateΛετϦʔϜʹྲྀͤΔ • ͞Βʹ subscript Ͱmapͯ͠Δ ͭ·ΓɺStorePublisherʹରͯ͠ KeyPath
Member Lookup ͯ͠ map ͠ Publisher Λฦͯ͠Δ
→ self.viewStore.publisher.count .assign(to: \.text, on: countLabel) .store(in: &self.cancellables) ͭ·Γ …
→ self.viewStore.publisher.count .assign(to: \.text, on: countLabel) .store(in: &self.cancellables) ࠨͷΑ͏ʹࣗલͰ .publisher
ʹ .map Λॻ͔ͳ͍͍ͯ͘ʂ ͭ·Γ …
→ self.viewStore.publisher.count .assign(to: \.text, on: countLabel) .store(in: &self.cancellables) ࠨͷΑ͏ʹࣗલͰ .publisher
ʹ .map Λॻ͔ͳ͍͍ͯ͘ʂ KeyPath Member Lookup ͬͯলུͰ͖Δʢӈʣɻ ͭ·Γ …
None
\\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏มݟ͑ͳͯ͘ྑͦ͞͏ ///
↓ \\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏มݟ͑ͳͯ͘ྑͦ͞͏ ///
↓ ετϦʔϜΛѻΘͣ State ͷϓϩύςΟ͕ཉ͍͠ͱ͖ɺ \\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏มݟ͑ͳͯ͘ྑͦ͞͏ ///
↓ ετϦʔϜΛѻΘͣ State ͷϓϩύςΟ͕ཉ͍͠ͱ͖ɺ State ͱ͍͏มݟ͑ͳ͍΄͏͕ରশੑ͕͋Δ…͔… \\\ ετϦʔϜΛѻ͏ͱ͖ State ͱ͍͏มݟ͑ͳͯ͘ྑͦ͞͏
///
7JFX4UPSF 4UBUF viewStore.count ͍ͩ͘͞ state.count: Int ฦ͢ viewStore.publisher.count ͍ͩ͘͞ StorePublisher<State>͔Β
StorePublisher<Int>ͳ count ฦ͢ ϓϩύςΟͷ ͕ཉ͍͠ 1VCMJTIFSΛ TJOLͯ͠ Ͳ͏ʹ͔͍ͨ͠
͓ΘΓʹ: ٞͷϙΠϯτ • KeyPath Member Lookup ͳͯ͘ྑ͍ͱࢥ͏͚Ͳ • Publisherͱͯ͠ཉ͍͠߹ͷΠϯλϑΣʔεͰ͞Λল͚ͯΔ •
StateͷϓϩύςΟ͕΄͍͠ͱ͖ɺKeyPath Member LookupΛ ͬͨ΄͏͕ରশੑ౷Ұײ͕͋Δͷ͔Δ