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Demystify SwiftUI 要約 / Summary of Demystify Swi...
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Elvis Shi
June 28, 2021
Programming
740
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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࠼ w FUD *EFOUJUZ
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*EFOUJUZ w େϙΠϯτͷதͰҰ൪ॏཁ w -JGFUJNF%FQFOEFODZɺ*EFOUJUZ͕͋Δ͔Β ͦ͜Γཱͭ w 4XJGU6*ʹछྨͷ*EFOUJUZ͕͋Δ w &YQMJDJU*EFOUJUZʢ໌ࣔత*%ʣ
w 4USVDUVSBM*EFOUJUZʢߏత*%ʣ
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id: \.name) { cat in Text("\(cat.age)ࡀ") } Explicit Identity
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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") }
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Structural Identity if flag { Text("A") } else { Text("B") } ద༻ͯ͠ϏϡʔͷඳըʹӨڹ͠ͳ͍.PEJ fi FSɻ PQBDJUZ QBEEJOH FUD
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-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
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࠶ඳը͞ΕΔ w CPEZ͕ݺΕ࣮ͯߦ͞ΕΔ
%FQFOEFODZ 7JFX 7JFX 7JFX 7JFX %FQFOEFODZ %FQFOEFODZ %FQFOEFODZ
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ࢀߟ IUUQTEFWFMPQFSBQQMFDPNWJEFPTQMBZXXED