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Demystify SwiftUI 要約 / Summary of Demystify Swi...
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Elvis Shi
June 28, 2021
Programming
730
3
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Demystify SwiftUI 要約 / Summary of Demystify SwiftUI
Elvis Shi
June 28, 2021
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Transcript
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} var employedBy = "YUMEMI Inc." var job = "iOS
Tech Lead" var favoriteLanguage = "Swift" var twitter = "@lovee" var qiita = "lovee" var github = "el-hoshino" var additionalInfo = """ ΠψͰ͕͢ɺԿ͔ʁ """ final class Me: Developable, Talkable {
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࣌ؒ ͦͦ ҧ͏ೣʁ
ࣸਅ͚ͩͰஅ͕Ͱ͖ͳ͍ w ҧ͏ೣͰͱͯࣅͯΔ͔͠Εͳ͍ w ಉ͡ೣͰ࣌ظʹΑͬͯݟ͕ͨҧ͏͔͠Εͳ͍ w அ͢ΔͨΊʹՃͷใ͕ඞཁ w ໊લ w
࠼ w FUD *EFOUJUZ
4XJGU6*Λཧղ͢ΔͨΊͷେϙΠϯτ w *EFOUJUZ w -JGFUJNF w %FQFOEFODZ 4XJGU6*͕͋ͳͨͷࢥ͏௨Γͷಈ࡞Λ͍ͯ͠ͳ͔ͬͨΒɺ େ͜ΕΒͷѻ͍͕ؒҧ͍ͬͯΔ͔Βɻ
*EFOUJUZ w େϙΠϯτͷதͰҰ൪ॏཁ w -JGFUJNF%FQFOEFODZɺ*EFOUJUZ͕͋Δ͔Β ͦ͜Γཱͭ w 4XJGU6*ʹछྨͷ*EFOUJUZ͕͋Δ w &YQMJDJU*EFOUJUZʢ໌ࣔత*%ʣ
w 4USVDUVSBM*EFOUJUZʢߏత*%ʣ
&YQMJDJU*EFOUJUZ w ಈతʹมΘΔϏϡʔʹɺ ΤϯδχΞ͕͚ͭΔ*% w ର͕Identifiable ʹద߹͍ͯ͠ͳ͍߹ *%ͷKeyPathΛࢦఆ ͢Δඞཁ͕͋Δ ForEach(cats,
id: \.name) { cat in Text("\(cat.age)ࡀ") } Explicit Identity
&YQMJDJU*EFOUJUZʹٻΊΒΕΔੑ࣭ w ϢχʔΫੑ w ଞͷରͱඃ͍ͬͯ ͚ͳ͍ w ෆมੑ w ͍ͭɺԿճݺͼग़ͯ͠
มΘ͍͚ͬͯͳ͍ ForEach(cats, id: \.name) { cat in Text("\(cat.age)ࡀ") } Explicit Identity
4USVDUVSBM*EFOUJUZ w ߏʹΑͬͯࣗಈతʹ ͚ΒΕΔ*% w JGจTXJUDIจͷذ ͕͋ͬͨΒҧ͏*%͕ ͚ΒΕΔ Structural Identity
if flag { Text("A") } else { Text("B") }
4USVDUVSBM*EFOUJUZͱͷ͖߹͍ํ w ಉ͡ϏϡʔͳΒɺذΛ ͯ͠ߦ͚ͳ͍ w ذΛͤͣʹ͏·͘ *OFSU.PEJ fi FSͳͲΛ ׆༻
Structural Identity if flag { Text("A") } else { Text("B") } ద༻ͯ͠ϏϡʔͷඳըʹӨڹ͠ͳ͍.PEJ fi FSɻ PQBDJUZ QBEEJOH FUD
ͳͥ*EFOUJUZ͕ॏཁ͔ w "OJNBUJPO͢Δͱ͖ͳͲͷஅࠜڌ w Ҡಈ͖͔͢ΫϩεϑΣʔυ͖͔͢ w Ϗϡʔͷ-JGFUJNFΛܾΊΔࠜڌ w ඞཁͳ͘ͳͬͨΒϝϞϦ͔Βফ͢
-JGFUJNF w 4XJGU6*ͷϏϡʔλΠϓܕ w ϏϡʔλΠϓͨͩͷϏϡʔඳըϨγϐ w ϏϡʔλΠϓͷΠϯελϯεࣗମඇৗʹ໋ w ͔͠͠Ϗϡʔͷੜଘظؒͬͱ͍ w
Ϗϡʔඞཁ͕͋ͬͨΒੜ͞Εɺඞཁͳ͘ͳͬͨΒফ͞ΕΔ w ੜ͞ΕͨΒonAppearɺফ͞ΕͨΒonDisappear͕ݺ ΕΔ w @State@StateObjectϏϡʔ͕ඞཁͳ͘ͳͬͨΒফ ͞ΕΔ
-JGFUJNF fl BHUSVF UBQ ࣌ؒ fl BHGBMTF struct Demo:
View { var flag: Bool var body: some View { if flag { Counter() .background(Color.blue) } else { Counter() .background(Color.red) } } } struct Counter: View { @State private var count = 0 var body: some View { Text("\(count)") .onTapGesture { count += 1 } } } fl BHUSVF ফ͞ΕΔ
-JGFUJNF fl BHUSVF UBQ ࣌ؒ fl BHGBMTF struct Demo:
View { var flag: Bool var body: some View { Counter() .background( flag ? Color.blue : Color.red ) } } struct Counter: View { @State private var count = 0 var body: some View { Text("\(count)") .onTapGesture { count += 1 } } } fl BHUSVF ফ͞Εͳ͍ Dependency
%FQFOEFODZ w %FQFOEFODZͨͩͷϏϡʔͷೖྗ w @State@StateObject͚ͩͰͳ͘ɺ @Bindingͨͩͷvarશͯ%FQFOEFODZ w bodyҎ֎શͯ%FQFOEFODZͱߟ͑ͯͳ͍ w %FQFOEFODZ͕มΘͬͨΒɺͦΕʹඥͮ͘Ϗϡʔ͕
࠶ඳը͞ΕΔ w CPEZ͕ݺΕ࣮ͯߦ͞ΕΔ
%FQFOEFODZ 7JFX 7JFX 7JFX 7JFX %FQFOEFODZ %FQFOEFODZ %FQFOEFODZ
·ͱΊ w *EFOUJUZΛ੍͢Δͷ4XJGU6*Λ੍͢Δ w -JGFUJNFΛҙ͠ͳ͍ͱඞཁͳঢ়ଶ͕ফ͑ͯ͠·͏ w %FQFOEFODZͰ࠷ඳը͢ΔϏϡʔΛநग़͍ͯ͠Δ
ࢀߟ IUUQTEFWFMPQFSBQQMFDPNWJEFPTQMBZXXED