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Data Essentials in SwiftUI
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ry-itto
July 09, 2020
Programming
1
490
Data Essentials in SwiftUI
集まれSwift好き!Swift愛好会スピンオフ WWDC20セッション要約会 @オンライン
ry-itto
July 09, 2020
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Transcript
3ZPZB*UP !SZJUUP %BUB&TTFOUJBMTJO4XJGU6* ू·Ε4XJGU͖ʂ4XJGUѪձεϐϯΦϑ88%$ηογϣϯཁձ!ΦϯϥΠϯ
ࣗݾհ ҏ౻྇ !SZJUUP ձେֶֶ෦ੜ Χϐόϥ͕͖
ηογϣϯͷ༰ w 4XJGU6*Ͱͷσʔλϑϩʔ w ΞϓϦͷσʔλϞσϧઃܭ w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
ηογϣϯͷ༰ w 4XJGU6*Ͱͷσʔλϑϩʔ w ΞϓϦͷσʔλϞσϧઃܭ w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
4XJGU6*Ͱͷσʔλϑϩʔ ϏϡʔΛ࡞Δ࣌ʹߟ͍͑ͨ̏ͭͷ࣭ w ࡞͢ΔϏϡʔͰඞཁͳσʔλԿ͔ʁ w ࡞͢ΔϏϡʔͰσʔλΛͲͷΑ͏ʹૢ࡞͢Δ͔ʁ w σʔλͲ͔͜ΒདྷΔʢ͞ΕΔʣͷ͔ʁ
4XJGU6*Ͱͷσʔλϑϩʔ ϏϡʔΛ࡞Δ࣌ʹߟ͍͑ͨ̏ͭͷ࣭ w ࡞͢ΔϏϡʔͰඞཁͳσʔλԿ͔ʁ CPPLͱ͍͏#PPLܕͷ QSPHSFTTͱ͍͏%PVCMFܕͷ ͦΕͧΕ͕͋ΕϏϡʔΛදࣔͰ͖ͦ͏ɻ w ࡞͢ΔϏϡʔͰσʔλΛͲͷΑ͏ʹૢ࡞͢Δ ͔ʁ
ಛʹͳͦ͞͏ w σʔλͲ͔͜ΒདྷΔʢ͞ΕΔʣͷ͔ʁ ͜ͷϏϡʔΛ͏ϏϡʔͰ͞ΕΔ͜ͱʹͳΓͦ͏ɻ struct BookCard : View { let book: Book let progress: Double var body: some View { HStack { Cover(book.coverName) VStack(alignment: .leading) { TitleText(book.title) AuthorText(book.author) } Spacer() RingProgressView(value: progress) } } }
4XJGU6*Ͱͷσʔλϑϩʔ ϏϡʔΛ࡞Δ࣌ʹߟ͍͑ͨ̏ͭͷ࣭ w ࡞͢ΔϏϡʔͰඞཁͳσʔλԿ͔ʁ CPPLͱ͍͏#PPLܕͷ QSPHSFTTͱ͍͏%PVCMFܕͷ ͦΕͧΕ͕͋ΕϏϡʔΛදࣔͰ͖ͦ͏ɻ w ࡞͢ΔϏϡʔͰσʔλΛͲͷΑ͏ʹૢ࡞͢ Δ͔ʁ
ಛʹͳͦ͞͏ w σʔλͲ͔͜ΒདྷΔʢ͞ΕΔʣͷ͔ʁ ͜ͷϏϡʔΛ͏ϏϡʔͰ͞ΕΔ͜ͱʹͳΓͦ͏ɻ struct BookCard : View { let book: Book let progress: Double var body: some View { HStack { Cover(book.coverName) VStack(alignment: .leading) { TitleText(book.title) AuthorText(book.author) } Spacer() RingProgressView(value: progress) } } } l4PVSDFPG5SVUIzͱ͍͏ݴ༿ͰηογϣϯͰѻΘΕΔ
4XJGU6*Ͱͷσʔλϑϩʔ ϏϡʔͰͷσʔλอ࣋ɺͦΕͧΕͲΜͳ࣌ʹ͏ʁ ϓϩύςΟϏϡʔʹΑͬͯมߋ͞Εͳ͍σʔλ !4UBUFϏϡʔʹΑͬͯอ࣋͞ΕΔҰ࣌తͳσʔλΛѻ͏ !#JOEJOHଞͷϏϡʔʹΑͬͯอ࣋͞Ε͍ͯΔσʔλΛมߋ͍ͨ͠߹
ηογϣϯͷ༰ w 4XJGU6*Ͱͷσʔλϑϩʔ w ΞϓϦͷσʔλϞσϧઃܭ w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
ΞϓϦͷσʔλϞσϧઃܭ σʔλϞσϧఆٛ w 0CTFSWBCMF0CKFDUΛ͏ w !1VCMJTIFEΛ͏ w ̎ͭͷ࣭ ࡞͢ΔϏϡʔͰσʔλΛͲͷΑ͏ʹૢ࡞͢ Δ͔ʁ
ʹ͑Δͷ༰қ class CurrentlyReading: ObservableObject { let book: Book @Published var progress = ReadingProgress() @Published var isFinished = false var currentProgress: Double { isFinished ? 1.0 : progress.progress } }
ΞϓϦͷσʔλϞσϧઃܭ ϏϡʔͰ࡞ͬͨϞσϧΛ͏ w ଞͷ̎ͭͷ࣭ʹ͍ͭͯʁ w ࡞͢ΔϏϡʔͰඞཁͳσʔλԿ͔ʁ w ࡞͢ΔϏϡʔͰσʔλΛͲͷΑ͏ʹૢ࡞͢Δ͔ʁ w σʔλͲ͔͜ΒདྷΔʢ͞ΕΔʣͷ͔ʁ
ΞϓϦͷσʔλϞσϧઃܭ ϏϡʔͰ࡞ͬͨϞσϧΛ͏ w ѻ͏ͨΊͷ1SPQFSUZ8SBQQFS͕̏ͭ w !0CTFSWFE0CKFDU w !&OWJSPONFOU0CKFDU w !4UBUF0CKFDU
/FX
ΞϓϦͷσʔλϞσϧઃܭ ϏϡʔͰ࡞ͬͨϞσϧΛ͏ !0CTFSWFE0CKFDU σʔλͷґଘؔΛ࡞Δ !&OWJSPONFOU0CKFDU Ϗϡʔ֊ؒͷ0CTFSWBCMF0CKFDUͷѻ͍Λศརʹ͢Δ !4UBUF0CKFDU /FX 0CTFSWBCMF0CKFDUΛϏϡʔͷϥΠϑαΠΫϧʹ݁ͼ͚ͭΔ
ηογϣϯͷ༰ w 4XJGU6*Ͱͷσʔλϑϩʔ w ΞϓϦͷσʔλϞσϧઃܭ w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ w ࢠͷϏϡʔͰϞσϧΛϓϩύςΟͰ ͍࣋ͬͯͯɺͦ͜ͰॳظԽ͍ͯ͠Δ ߹ w 3FBEJOH-JTU7JFXFS͕ࡍϨϯμϦϯά͞ ΕΔͨͼʹϞσϧͷΠϯελϯε͕ੜ ͞Εͯ͠·͏
struct ReadingListViewer: View { var body: some View { NavigationView { ReadingList() Placeholder() } } } struct ReadingList: View { @ObservedObject var store = ReadingListStore() var body: some View { // ... } }
࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ ղܾࡦ w !4UBUF0CKFDUΛΘΓʹ͏͜ͱ Ͱղܾ͕Ͱ͖ΔʢΒ͍͠ʣ w !4UBUF0CKFDUΛ༻͢Δͱ4XJGU6*͕ దͳλΠϛϯάͰΠϯελϯεԽΛ͠ ͯ͘ΕΔͱͷ͜ͱ struct
ReadingListViewer: View { var body: some View { NavigationView { ReadingList() Placeholder() } } } struct ReadingList: View { @StateObject var store = ReadingListStore() var body: some View { // ... } }
࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ ୭͕σʔλΛ࣋ͭͷ͔ w ڞ௨ͷઌʹ࣋ͭ w !4UBUF0CKFDUΛͬͯͦͷϏϡʔ͕ࣗ࣋ͭ w ΞϓϦͷάϩʔόϧͳσʔλͱͯ࣋ͭ͠ w "QQΛܧঝͨ͠Ϗϡʔʹ!4UBUFͳͲΛར༻ͯ͠એݴͯ͋͛͠Δ
࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ σʔλͷӬଓԽ w 4DFOF4UPSBHF w 4XJGU6*͕ཧ͍ͯ͠ΔϏϡʔͰ͔͑͠ͳ͍ w ߲ͷબঢ়ଶͳͲΛอଘ w "QQ4UPSBHF
w 6TFS%FGBVMUΛ༻ͨ͠άϩʔόϧετϨʔδ w ઃఆͳͲͷখ͞ͳσʔλΛอଘ
͓·͚ ৽͘͠Ճ͞ΕͨΠϕϯτιʔε w PO$IBOHF w PO0QFO63- w PO$POUJOVF6TFS"DUJWJUZ