(Appleが)やりたい放題 Swift Attributes

札幌iPhoneアプリ開発者勉強協会資料
https://devsap.connpass.com/event/207402/

題目
1) SwiftUIで説明しづらい@定義
2) Swift Attributesを大枠で分けてみる
3) Swift Attributesから見るSwiftの進化
4) まとめ

Transcript

1. "QQMF͕
   ΍Γ͍ͨ์୊
   4XJGU"UUSJCVUFT
   

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2. ࣗݾ঺հ
   

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3. ೳొཁ !OPUPSPJE
   
   w J04ΞϓϦ։ൃऀ
   w ԰߸͍Γ·͢ిࢉاը
   w !OPUPSPJE
   w !JSJNBTV
   w ࠷ۙͷಈ޲
   w ϒϩά࡮৽͠·ͨ͠
   

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4. ॆిใࠂ͞Μ #BUUFSFDFJWFS
   
   w όοςϦʔϞχλʔ ϢʔςΟϦςΟʔ
   
   w ࠷େ୆ ࣮ػϦϞʔτ୆
   
   w ख࣋ͪͷJ1IPOF͔Βଞʹ͍࣋ͬͯΔ
   J1IPOF J1BEͳͲͷػثͷόοςϦʔঢ়ଶ֬
   ೝՄೳ
   w ࣗ୐ʹ͋ΔJ1IPOFͷόοςϦʔঢ়ଶ֬ೝՄ
   ೳ
   

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5. ॆిใࠂ͞Μ #BUUFSFDFJWFS
   
   w "QQMF8BUDIରԠ
   w $PNQMJDBUJPOTରԠ
   w ॆి׬ྃ௨஌
   w ॆి׬ྃΛ఻͑ͯ͘ΕΔ௨஌Λ௥Ճ
   w ҎԼʹࢦఆ͢Δ͜ͱͰόοςϦʔΛέ
   Ξ͢Δ͜ͱ͕Մೳ
   w Կ͔ͱߴ͍J1IPOFΛ௕࣋ͪͤ͞Δͷʹ༗༻
   

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6. ࿩͢͜ͱ
   w 4XJGU"UUSJCVUFTͷେ࿮
   w 4XJGU6*ͱ4XJGU"UUSJCVUFTͷؔ܎
   w "QQMFͷͱΓ͏Δಈ͖Λ༧ଌ͢Δ
   

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7. ࿩͞ͳ͍͜ͱ
   w 4XJGU"UUSJCVUFTͷৄࡉ
   w ιʔείʔυΛ࢖ͬͨղઆ
   

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8. ୊໨
   w 4XJGU6*Ͱઆ໌ͮ͠Β͍!ఆٛ
   w 4XJGU"UUSJCVUFTΛେ࿮Ͱ෼͚ͯΈΔ
   w 4XJGU"UUSJCVUFT͔ΒݟΔ4XJGUͷਐԽ
   w ·ͱΊ
   

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9. 4XJGU6*Ͱઆ໌ͮ͠Β͍!ఆٛ
   

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10. J045FDI#MPH JSJNBTVDPN
    ઈࢍ౤ߘதͰ͢
    

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11. 4XJGU6* J04ΞϓϦΛओʹ౤ߘ
    

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12. ϒϩάهࣄΛ
    ݕ౼͍ͯͨ͋͠Δ೔
    

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13. TextFieldͷهࣄΛॻ͜͏
    

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14. import SwiftUI
    
    
    struct ContentView: View {
    
    
    @State var myfield = ""
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    var body: some View {
    
    
    VStack {
    
    
    Spacer()
    
    
    TextField("Label", text: $my
    
    
    .padding(EdgeInsets(top:
    .background(
    
    
    Rectangle()
    
    
    .stroke(Color.gr
    
    
    )
    
    
    .padding()
    
    
    TextField("Label", text: $my
    
    
    .padding(EdgeInsets(top:
    
    
    

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15. import SwiftUI
    
    
    struct ContentView: View {
    
    
    @State var myfield = ""
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    @ScaledMetric(relativeTo: .body) var
    
    
    var body: some View {
    
    
    VStack {
    
    
    Spacer()
    
    
    TextField("Label", text: $my
    
    
    .padding(EdgeInsets(top:
    .background(
    
    
    Rectangle()
    
    
    .stroke(Color.gr
    
    
    )
    
    
    .padding()
    
    
    TextField("Label", text: $my
    
    
    .padding(EdgeInsets(top:
    
    
    

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16. !4UBUF
    !4DBMF.FUSJD
    ͱ͸Կ
    

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17. !ఆٛʹ͍ͭͯ
    આ໌ͨ͜͠ͱ͕ͳ͍ɻ
    

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18. ͦ΋ͦ΋!ఆٛͱ͍͏
    ໊শͰ͢Βͳ͍ɻ
    

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19. !ఆٛͱ͸ͳΜͳͷ͔
    

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20. QSPQFSUZ8SBQQFS
    ωλόϨ
    ͩΑɻ
    

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21. ͦΜͳࣄ͸
    Θ͔͍ͬͯΔͷͩΑɻ
    

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22. !ఆٛपΓେ࿮Ͱௐ΂ͯ
    "QQMFͷ܏޲Λ஌Γ͍ͨɻ
    

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23. 4XJGU"UUSJCVUFΛେ࿮Ͱ
    ·ͱΊ͍ͯΔ
    

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24. !ఆٛͷਖ਼໊ࣜশ͸
    4XJGU"UUSJCVUFT
    

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25. 4XJGU"UUSJCVUFࢀߟαΠτ
    w 4XJGUͷBUUSJCVUFશղઆʛશछ2JJUB
    w IUUQTRJJUBDPNTIUOLHNJUFNTDCBCDECD
    w "UUSJCVUFTŠ5IF4XJGU1SPHSBNNJOH-BOHVBHF 4XJGU
    
    w IUUQTEPDTTXJGUPSHTXJGUCPPL3FGFSFODF.BOVBM
    "UUSJCVUFTIUNM
    

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26. 4XJGU"UUSJCVUFTᶃ
    4XJGUʹ͸ɺએݴʹద༻͞ΕΔଐੑͱܕʹద
    ༻͞ΕΔଐੑͷछྨ͕͋Γ·͢ɻଐੑ͸ɺ
    એݴ·ͨ͸ܕʹؔ͢Δ௥Ճ৘ใΛఏڙ͠·
    ͢ɻ %FFQ-຋༁
    ɻ
    

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27. 4XJGU"UUSJCVUFTᶄ
    • @attribute name
    
    
    • @attribute name(attribute arguments)
    

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28. 4XJGU"UUSJCVUFTᶅ
    J044%,࣌఺Ͱछྨ
    

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29. BWBJMBCMF JOMJOBCMF PCKD 6*"QQMJDBUJPO.BJO VOLOPXO
    EJTDBSEBCMF3FTVMU NBJO PCKD.FNCFST VTBCMF'SPN*OMJOF
    EZOBNJD$BMMBCMF OPOPCKD QSPQFSUZ8SBQQFS
    XBSO@VORVBMJ
    fi
    FE@BD
    DFTT
    EZOBNJD.FNCFS-P
    PLVQ
    /4"QQMJDBUJPO.BJO SFTVMU#VJMEFS BVUPDMPTVSF
    GSP[FO /4$PQZJOH
    SFRVJSFT@TUPSFE@QSP
    QFSUZ@JOJUT
    DPOWFOUJPO
    (,*OTQFDUBCMF /4.BOBHFE UFTUBCMF FTDBQJOH
    

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30. ެࣜͷϖʔδͰ͸ΞϧϑΝϕοτॱ
    ಛʹάϧʔϓԽ͞Ε͍ͯͳ͍
    

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31. ଟ͍ͷͰେ࿮Ͱ෼ྨͯ͠Έͨ
    

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32. େ࿮Ͱ෼ྨᶃ
    B ઌୡݴޠͱͷޓ׵ੑ
    C 4XJGUݴޠͷ࢓༷Λิ଍͢Δ΋ͷ
    D ϑϨʔϜϫʔΫ։ൃͷαϙʔτ
    E 4UPSZCPBSETʹؔ͢Δಛघࣄ৘ʹΑΔ΋ͷ
    F ݻ༗ϑϨʔϜϫʔΫ΁ͷରԠ
    G ֎తͳ࢓༷มߋʹରԠ͢Δඞཁ͕͋Δ΋ͷ
    

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33. େ࿮Ͱ෼ྨᶄ
    H Ϗϧυ࣌ͷνϡʔχϯάΛ໌ࣔ͢Δ΋ͷ
    I ςετ࣌ͷརศੑΛਤΔ΋ͷ
    J ஗ԆධՁɾಈతࢀরΛಋೖ͍ͨ͠΋ͷ
    K ଞݴޠͱͷݺͼग़͠ํ๏Λॊೈʹ͢Δ΋ͷ
    L 4XJGUݴޠࣗମΛ֦ு͢Δ΋ͷ
    

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34. Bઌୡݴޠͱͷޓ׵ੑ
    w $ݴޠΛݺͼग़͠Մೳʹ 0CKFDUJF$Λݺͼग़͠Մೳʹ
    w ؔ਺ϙΠϯλͷޓ׵ੑࢦఆ !DPOWFOUJPO
    
    w ໭Γ஋͕͋Δ͕ෆཁѻ͍ʹରԠ͢ΔͨΊ !EJTDBSEBCMF3FTVMU
    
    w 0CKFDUJWF$ͷϓϩύςΟͷίϐʔଐੑରԠ !/4$PQZJOH
    
    w NBJOؔ਺ͷӅṭ !6*"QQMJDBUJPO.BJO !/4"QQMJDBUJPO.BJO
    
    w ϚϧνϓϥοτϑΥʔϜʹ΋ରԠͨ͠NBJOؔ਺ͷӅṭ !NBJO
    
    

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35. C4XJGUݴޠͷ࢓༷Λิ଍͢Δ΋ͷ
    w είʔϓ֎Ͱ΋Ϋϩʔδϟʔอ࣋Λ໌ࣔ͢Δ΋ͷ !FTDBQJOH
    
    

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36. DϑϨʔϜϫʔΫ։ൃͷαϙʔτ
    w ϑϨʔϜϫʔΫར༻ऀʹඇਪ঑Ͱ͋Δ͜ͱΛࣔ͢(@available)
    
    w SwiftͰ࡞੒͞ΕͨϑϨʔϜϫʔΫ
    
    w ʙΛObjectie-C͔Βݺͼग़͠Մೳʹ(@objc)
    
    w ʙΛObjective-C͔Βݺͼग़͠ෆՄʹ(@nonobjc)
    
    w ʙΛObjective-C͔ΒҰׅͰݺͼग़͠Մೳʹ(@objcMembers)
    
    w τοϓϨϕϧͷΦϒδΣΫτ͕ଞϑϨʔϜϫʔΫͱࠞࡏΛආ͚Δ(@warn_unquali
    fi
    ed_access)
    
    w ໌ࣔతʹকདྷόʔδϣϯͰͷվมΛ੍ݶ͢Δ΋ͷ(@frozen)
    

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37. E4UPSZCPBSETʹؔ͢Δಛघࣄ৘ʹΑΔ΋ͷ
    w 4XJGUݴޠͷݫີ͔͞Βݴ͏ͱ*OUFSGBDF#VJMEFSͷ"DUJPO 0VUMFU͸͔ͳΓ
    ಛघͳಈ͖
    
    w @IBAction
    
    w @IBOutlet
    
    w @IBDesignable
    
    w @IBInspectable
    
    w @IBSegueAction
    

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38. Fݻ༗ϑϨʔϜϫʔΫ΁ͷରԠ
    w (BNF,JUʹରԠ͢Δ΋ͷ !(,*OTQFDUBCMF
    
    w $PSF%BUBʹରԠ͢Δ΋ͷ !/4.BOBHFE
    
    w !SFRVJSFT@TUPSFE@QSPQFSUZ@JOJUT
    

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39. G֎తͳ࢓༷มߋʹରԠ͢Δඞཁ͕͋Δ΋ͷ
    w ྻڍʹະ஌ͷఆؚ͕ٛ·Εͨ৔߹ͷ৚݅هड़ !VOLOPXO
    
    

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40. HϏϧυ࣌ͷνϡʔχϯάΛ໌ࣔ͢Δ΋ͷ
    w ΠϯϥΠϯల։ʹؔ͢Δ΋ͷ(@inlinable)
    
    w ΠϯϥΠϯల։಺Ͱͷར༻ʹ੍ݶ͢Δ΋ͷ(@usableFromInline)
    

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41. Iςετ࣌ͷརศੑΛਤΔ΋ͷ
    w ςετ࣌ʹΞΫηεՄೳͱ͢Δ(@testable)
    

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42. J஗ԆධՁΛಋೖ͍ͨ͠΋ͷ
    w Ҿ਺Ͱ౉͞Εͨ஋ΛΫϩʔδϟʔԽ͠஗ԆධՁͤ͞Δ(@autoclosure)
    

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43. Kଞݴޠͱͷݺͼग़͠ํ๏Λॊೈʹ͢Δ΋ͷ
    w ߏ଄ମΛॊೈͳҾ਺Ͱݺͼग़ͤΔ༷ʹ͢Δ΋ͷ(@dynamicCallable)
    
    w ߏ଄ମΛ࣮૷࣌ʹଘࡏ͠ͳ͍ϓϩύςΟ΁ΞΫηεՄೳͱ͢Δ΋ͷ
    (@dynamicMemberLookup)
    

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44. LݴޠࣗମΛ֦ு͢Δ΋ͷ
    w ม਺ʹ෇ՃͰ͖Δ4XJGU"UUSJCVUFΛ֦ு͢Δ !QSPQFSUZ8SBQQFS
    
    
    w ؔ਺ͷ໭Γ஋Λ༧໿ݴޠʹ·Ͱհೖ͠ػೳ֦ு͢Δ΋ͷ(@resultBuilder)
    

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45. 4XJGU"UUSJCVUFTͷҹ৅͸
    ࡶଟͳػೳͷू߹ʹݟ͑Δ
    

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46. ࡶଟ͕ͩ਺Λҙࣝ͠ͳ͍ͷ͸
    ༻్͝ͱ8FCͰݕࡧͯ͠࢖͏
    

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47. 4XJGU"UUSJCVUFʹݴޠࣗମΛ֦ு͢Δ
    ػೳ͕૿͑ͨ͜ͱͰݕࡧΩʔϫʔυΛ
    બͿͷʹ೉ّ
    

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48. 4XJGU"UUSJCVUFT͔ΒݟΔ
    4XJGUͷਐԽ
    

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49. छʹ෼͚͕ͨ
    

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50. छͰ΋ଟ͍Θ
    

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51. छ͔ΒछΛϐοΫΞοϓ
    

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52. 4XJGUਐԽͷྺ࢙ᶃ
    w 4XJGUॳظ
    w !*#0VUMFU !*#"DUJPO
    w $ݴޠɺ0CKFDUJWF$ͷػೳݺͼग़͠ɺ4%,ରԠ
    

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53. Bઌୡݴޠͱͷޓ׵ੑ
    w $ݴޠΛݺͼग़͠Մೳʹ 0CKFDUJF$Λݺͼग़͠Մೳʹ
    w ؔ਺ϙΠϯλͷޓ׵ੑࢦఆ !DPOWFOUJPO
    
    w ໭Γ஋͕͋Δ͕ෆཁѻ͍ʹରԠ͢ΔͨΊ !EJTDBSEBCMF3FTVMU
    
    w 0CKFDUJWF$ͷϓϩύςΟͷίϐʔଐੑରԠ !/4$PQZJOH
    
    w NBJOؔ਺ͷӅṭ !6*"QQMJDBUJPO.BJO !/4"QQMJDBUJPO.BJO
    
    w ϚϧνϓϥοτϑΥʔϜʹ΋ରԠͨ͠NBJOؔ਺ͷӅṭ !NBJO
    
    

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54. E4UPSZCPBSETʹؔ͢Δಛघࣄ৘ʹΑΔ΋ͷ
    w 4XJGUݴޠͷݫີ͔͞Βݴ͏ͱ*OUFSGBDF#VJMEFSͷ"DUJPO 0VUMFU͸͔ͳΓ
    ಛघͳಈ͖
    
    w @IBAction
    
    w @IBOutlet
    
    w @IBDesignable
    
    w @IBInspectable
    
    w @IBSegueAction
    

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55. 4XJGUਐԽͷྺ࢙ᶄ
    w 4XJGU࢓༷҆ఆظ
    w 4XJGUͷ࢓༷͕ݻ·Γ࢝Ί֦ுػೳ͕4XJGU"UUSJCVUF΁௥Ճ͢ΔΑ͏ʹ
    w 4XJGU͚ͩͰϑϨʔϜϫʔΫ࣮૷Մೳʹ
    

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56. DϑϨʔϜϫʔΫ։ൃͷαϙʔτ
    w ϑϨʔϜϫʔΫར༻ऀʹඇਪ঑Ͱ͋Δ͜ͱΛࣔ͢(@available)
    
    w SwiftͰ࡞੒͞ΕͨϑϨʔϜϫʔΫ
    
    w ʙΛObjectie-C͔Βݺͼग़͠Մೳʹ(@objc)
    
    w ʙΛObjective-C͔Βݺͼग़͠ෆՄʹ(@nonobjc)
    
    w ʙΛObjective-C͔ΒҰׅͰݺͼग़͠Մೳʹ(@objcMembers)
    
    w τοϓϨϕϧͷΦϒδΣΫτ͕ଞϑϨʔϜϫʔΫͱࠞࡏΛආ͚Δ(@warn_unquali
    fi
    ed_access)
    
    w ໌ࣔతʹকདྷόʔδϣϯͰͷվมΛ੍ݶ͢Δ΋ͷ(@frozen)
    

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57. 4XJGUਐԽͷྺ࢙ᶅ
    w ࠷ۙ ʙ
    
    w ଞݴޠͰͷݺͼग़͠Λ༻ҙʹ͢ΔͨΊಈతࢀরΛ࠶औΓࠐΈ
    w !ఆٛΛ֦ுͰ͖ΔΑ͏ʹ
    w ໭Γ஋ͷ֦ு ༧໿ޠ·Ͱؔ༩͢Δڍಈมߋ͕Մೳ
    
    

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58. 4XJGUͷΞοϓσʔτྺ࢙ᶅ
    w ࠷ۙ ʙ
    
    w ଞݴޠͰͷݺͼग़͠Λ༻ҙʹ͢ΔͨΊಈతࢀরΛ࠶औΓࠐΈ
    w !ఆٛΛ֦ுͰ͖ΔΑ͏ʹ
    w ໭Γ஋ͷ֦ு ༧໿ޠ·Ͱؔ༩͢Δڍಈมߋ͕Մೳ
    
    ॏཁ
    

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59. LݴޠࣗମΛ֦ு͢Δ΋ͷ
    w ม਺ʹ෇ՃͰ͖Δ4XJGU"UUSJCVUFΛ֦ு͢Δ !QSPQFSUZ8SBQQFS
    
    
    w ؔ਺ͷ໭Γ஋Λ༧໿ݴޠʹ·Ͱհೖ͠ػೳ֦ு͢Δ΋ͷ(@resultBuilder)
    

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60. 4XJGU6*Ͱͷ4XJGU"UUSJCVUF
    w !SFTVMU#VJMEFS !@GVODUJPO#VJMEFS͔Β໊শมߋ
    
    w 4XJGUͷ༧໿ޠɺฒͼ·Ͱؔ༩ 4XJGU6*্ͰͷJGจ
    
    w هड़ϧʔϧΛڧ੍ 4XJGU6*Ͱ͸ݴޠͷ%4-Խʹ࢖༻
    
    w هड़ΤϥʔΛίϯύΠϥϨϕϧͰิ଍Ͱ͖Δ
    w !QSPQFSUZ8SBQQFS
    w ม਺ʹ෇༩͢Δ4XJGU"UUSJCVUFΛ֦ு ಠࣗఆٛͷ௥Ճ
    
    w 4XJGU6*Ͱ͸ม਺ͷମࡋΛอͪͭͭ୺తʹػೳ෇༩ʹ࢖༻
    

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61. struct ContentView: View {
    
    
    @State var isRounded = true // propertyWrapper
    
    
    // ViewͷBody͸1ͭͷView͔͠هड़Ͱ͖ͳ͍
    
    
    var body: some View {
    
    
    // isRounded ʙ else ·Ͱ͸resultBuilderʹΑΔهड़ϧʔϧͰ͋ͬͯݴޠͷifจͱ͸ҟͳΔ
    
    
    // ৗʹܕ͸ҧ͏͕1ͭͷViewΛฦ͢
    
    
    if isRounded {
    
    
    RoundedRectangle(cornerRadius: 20)
    
    
    .foregroundColor(.orange)
    
    
    .frame(width: 72, height: 72)
    
    
    .onTapGesture {
    
    
    isRounded = !isRounded
    
    
    }
    
    
    } else {
    
    
    Rectangle()
    
    
    .foregroundColor(.blue)
    
    
    .frame(width: 72, height: 72)
    
    
    .onTapGesture {
    
    
    isRounded = !isRounded
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    

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62. struct ContentView: View {
    
    
    @State var isRounded = true // propertyWrapper
    
    
    // ViewͷBody͸1ͭͷView͔͠هड़Ͱ͖ͳ͍
    
    
    var body: some View {
    
    
    // isRounded ʙ else ·Ͱ͸resultBuilderʹΑΔهड़ϧʔϧͰ͋ͬͯݴޠͷifจͱ͸ҟͳΔ
    
    
    // ৗʹܕ͸ҧ͏͕1ͭͷViewΛฦ͢
    
    
    if isRounded {
    
    
    RoundedRectangle(cornerRadius: 20)
    
    
    .foregroundColor(.orange)
    
    
    .frame(width: 72, height: 72)
    
    
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