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

Transcript

1. 3ZPZB
   *UP !SZJUUP
   
    %BUB
   &TTFOUJBMT
   JO
   4XJGU6* ू·Ε4XJGU޷͖ʂ4XJGUѪ޷ձεϐϯΦϑ
   88%$ηογϣϯཁ໿ձ
   !ΦϯϥΠϯ
   
2. ࣗݾ঺հ ҏ౻྇໵ !SZJUUP
   ձ௡େֶֶ෦೥ੜ
   Χϐόϥ͕޷͖
3. ηογϣϯͷ಺༰ w 4XJGU6*
   Ͱͷσʔλϑϩʔ
   w ΞϓϦͷσʔλϞσϧઃܭ
   w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
4. ηογϣϯͷ಺༰ w 4XJGU6*
   Ͱͷσʔλϑϩʔ
   w ΞϓϦͷσʔλϞσϧઃܭ
   w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
5. 4XJGU6*
   Ͱͷσʔλϑϩʔ ϏϡʔΛ࡞Δ࣌ʹߟ͍͑ͨ̏ͭͷ࣭໰ w ࡞੒͢ΔϏϡʔͰඞཁͳσʔλ͸Կ͔ʁ
   w ࡞੒͢ΔϏϡʔͰ͸σʔλΛͲͷΑ͏ʹૢ࡞͢Δ͔ʁ
   w σʔλ͸Ͳ͔͜ΒདྷΔʢ౉͞ΕΔʣͷ͔ʁ
   
6. 4XJGU6*
   Ͱͷσʔλϑϩʔ ϏϡʔΛ࡞Δ࣌ʹߟ͍͑ͨ̏ͭͷ࣭໰ w ࡞੒͢ΔϏϡʔͰඞཁͳσʔλ͸Կ͔ʁ
   CPPL
   ͱ͍͏
   #PPL
   ܕͷ஋
   QSPHSFTT
   ͱ͍͏
   %PVCMF
   ܕͷ஋
   ͦΕͧΕ͕͋Ε͹ϏϡʔΛදࣔͰ͖ͦ͏ɻ
   w ࡞੒͢ΔϏϡʔͰ͸σʔλΛͲͷΑ͏ʹૢ࡞͢Δ ͔ʁ
   ಛʹͳͦ͞͏
   w σʔλ͸Ͳ͔͜ΒདྷΔʢ౉͞ΕΔʣͷ͔ʁ
   ͜ͷϏϡʔΛ࢖͏ϏϡʔͰ౉͞ΕΔ͜ͱʹͳΓͦ͏ɻ
   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) } } }
7. 4XJGU6*
   Ͱͷσʔλϑϩʔ ϏϡʔΛ࡞Δ࣌ʹߟ͍͑ͨ̏ͭͷ࣭໰ w ࡞੒͢ΔϏϡʔͰඞཁͳσʔλ͸Կ͔ʁ
   CPPL
   ͱ͍͏
   #PPL
   ܕͷ஋
   QSPHSFTT
   ͱ͍͏
   %PVCMF
   ܕͷ஋
   ͦΕͧΕ͕͋Ε͹ϏϡʔΛදࣔͰ͖ͦ͏ɻ
   w ࡞੒͢ΔϏϡʔͰ͸σʔλΛͲͷΑ͏ʹૢ࡞͢ Δ͔ʁ
   ಛʹͳͦ͞͏
   w σʔλ͸Ͳ͔͜ΒདྷΔʢ౉͞ΕΔʣͷ͔ʁ
   ͜ͷϏϡʔΛ࢖͏ϏϡʔͰ౉͞ΕΔ͜ͱʹͳΓͦ͏ɻ
   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) } } } l4PVSDF
   PG
   5SVUIz
   ͱ͍͏ݴ༿Ͱηογϣϯ಺Ͱ͸ѻΘΕΔ
8. 4XJGU6*
   Ͱͷσʔλϑϩʔ ϏϡʔͰͷσʔλอ࣋ɺͦΕͧΕͲΜͳ࣌ʹ࢖͏ʁ ϓϩύςΟ
   
   ϏϡʔʹΑͬͯมߋ͞Εͳ͍σʔλ
   !4UBUF
   
   ϏϡʔʹΑͬͯอ࣋͞ΕΔҰ࣌తͳσʔλΛѻ͏
   !#JOEJOH
   
   ଞͷϏϡʔʹΑͬͯอ࣋͞Ε͍ͯΔσʔλΛมߋ͍ͨ͠৔߹
   
9. ηογϣϯͷ಺༰ w 4XJGU6*
   Ͱͷσʔλϑϩʔ
   w ΞϓϦͷσʔλϞσϧઃܭ
   w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
10. ΞϓϦͷσʔλϞσϧઃܭ σʔλϞσϧఆٛ w 0CTFSWBCMF0CKFDU
    Λ࢖͏
    w !1VCMJTIFE
    Λ࢖͏
    w ̎ͭ໨ͷ࣭໰
    ࡞੒͢ΔϏϡʔͰ͸σʔλΛͲͷΑ͏ʹૢ࡞͢ Δ͔ʁ
    ʹ౴͑Δͷ͸༰қ class CurrentlyReading: ObservableObject { let book: Book @Published var progress = ReadingProgress() @Published var isFinished = false var currentProgress: Double { isFinished ? 1.0 : progress.progress } }
11. ΞϓϦͷσʔλϞσϧઃܭ ϏϡʔͰ࡞ͬͨϞσϧΛ࢖͏ w ଞͷ̎ͭͷ࣭໰ʹ͍ͭͯ͸ʁ
    w ࡞੒͢ΔϏϡʔͰඞཁͳσʔλ͸Կ͔ʁ
    w ࡞੒͢ΔϏϡʔͰ͸σʔλΛͲͷΑ͏ʹૢ࡞͢Δ͔ʁ
    w σʔλ͸Ͳ͔͜ΒདྷΔʢ౉͞ΕΔʣͷ͔ʁ
    
12. ΞϓϦͷσʔλϞσϧઃܭ ϏϡʔͰ࡞ͬͨϞσϧΛ࢖͏ w ѻ͏ͨΊͷ
    1SPQFSUZ8SBQQFS
    ͕̏ͭ
    w !0CTFSWFE0CKFDU
    w !&OWJSPONFOU0CKFDU
    w !4UBUF0CKFDU
    /FX
13. ΞϓϦͷσʔλϞσϧઃܭ ϏϡʔͰ࡞ͬͨϞσϧΛ࢖͏ !0CTFSWFE0CKFDU
    
    
    σʔλͷґଘؔ܎Λ࡞Δ
    !&OWJSPONFOU0CKFDU
    
    
    Ϗϡʔ֊૚ؒͷ
    0CTFSWBCMF0CKFDU
    ͷѻ͍Λศརʹ͢Δ
    !4UBUF0CKFDU
    /FX
    
    
    0CTFSWBCMF0CKFDU
    ΛϏϡʔͷϥΠϑαΠΫϧʹ݁ͼ͚ͭΔ
14. ηογϣϯͷ಺༰ w 4XJGU6*
    Ͱͷσʔλϑϩʔ
    w ΞϓϦͷσʔλϞσϧઃܭ
    w ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ
15. ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ ໰୊ w ࢠͷϏϡʔͰϞσϧΛϓϩύςΟͰ ͍࣋ͬͯͯɺͦ͜ͰॳظԽ͍ͯ͠Δ ৔߹
    w 3FBEJOH-JTU7JFXFS
    ͕ࡍϨϯμϦϯά͞ ΕΔͨͼʹϞσϧͷΠϯελϯε͕ੜ੒ ͞Εͯ͠·͏ struct ReadingListViewer: View { var body: some View { NavigationView { ReadingList() Placeholder() } } } struct ReadingList: View { @ObservedObject var store = ReadingListStore() var body: some View { // ... } }
16. ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ ղܾࡦ w !4UBUF0CKFDU
    Λ୅ΘΓʹ࢖͏͜ͱ Ͱղܾ͕Ͱ͖ΔʢΒ͍͠ʣ
    w !4UBUF0CKFDU
    Λ࢖༻͢Δͱ
    4XJGU6*
    ͕ ద੾ͳλΠϛϯάͰΠϯελϯεԽΛ͠ ͯ͘ΕΔͱͷ͜ͱ struct ReadingListViewer: View { var body: some View { NavigationView { ReadingList() Placeholder() } } } struct ReadingList: View { @StateObject var store = ReadingListStore() var body: some View { // ... } }
17. ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ ୭͕σʔλΛ࣋ͭͷ͔ w ڞ௨ͷ૆ઌʹ࣋ͭ
    w !4UBUF0CKFDU
    Λ࢖ͬͯͦͷϏϡʔࣗ਎͕࣋ͭ
    w ΞϓϦ಺ͷάϩʔόϧͳσʔλͱͯ࣋ͭ͠
    w "QQ
    Λܧঝͨ͠Ϗϡʔʹ
    !4UBUF
    ͳͲΛར༻ͯ͠એݴͯ͋͛͠Δ
18. ࣮ࡍʹΞϓϦʹऔΓೖΕΔࡍͷςΫχοΫ σʔλͷӬଓԽ w 4DFOF4UPSBHF
    w 4XJGU6*
    ͕؅ཧ͍ͯ͠ΔϏϡʔͰ͔͠࢖͑ͳ͍
    w ߲໨ͷબ୒ঢ়ଶͳͲΛอଘ
    w "QQ4UPSBHF
    w 6TFS%FGBVMU
    Λ࢖༻ͨ͠άϩʔόϧετϨʔδ
    w ઃఆͳͲͷখ͞ͳσʔλΛอଘ
19. ͓·͚ ৽͘͠௥Ճ͞ΕͨΠϕϯτιʔε w PO$IBOHF
    w PO0QFO63-
    w PO$POUJOVF6TFS"DUJWJUZ