Refactor with using `available` and `deprecated`

potatotips#80

Transcript

1. !@LJ
   BWBJMBCMFͱEFQSFDBUFEΛ࢖ͬͯ
   ޮ཰త͔ͭ҆શʹ
   ϦϑΝΫλϦϯάΛਐΊΔ
   
   QPUBUPUJQT
   

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2. "CPVUNF
   struct Me {
   
   
   let name = "Takuhiro Muta"
   
   
   let aka = "417.72KI"
   
   
   let company = "(redacted)"
   
   
   let twitter = "417_72ki"
   
   
   let qiita = "417_72ki"
   
   
   let gitHub = "417-72KI"
   
   
   let products = [
   
   
   "MockUserDefaults",
   
   
   "MultipartFormDataParser",
   
   
   "BuildConfig.swift",
   
   
   "SSGH"
   
   
   ]
   
   
   let contributing = [
   
   
   "Danger-Swift",
   
   
   "octokit.swift",
   
   
   "etc..."
   
   
   ]
   
   
   }
   

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3. طଘίʔυʹUZQPΛݟ͚ͭͨΒ
   Ͳ͏͠·͔͢ʁ
   

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4. w मਖ਼͢Δ
   w ݟͳ͔ͬͨ͜ͱʹ͢Δ
   

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5. w मਖ਼͢Δ
   w 3FGBDUPS3FOBNF
   w 'JOEBOE3FQMBDFJO1BDLBHF
   w ݟͳ͔ͬͨ͜ͱʹ͢Δ
   

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6. w मਖ਼͢Δ
   w 3FGBDUPS3FOBNF
   w 'JOEBOE3FQMBDFJO1BDLBHF
   w ݟͳ͔ͬͨ͜ͱʹ͢Δ
   

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7. 3FGBDUPS3FOBNF
   

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8. 😩
   

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9. w मਖ਼͢Δ
   w 3FGBDUPS3FOBNF
   w 'JOEBOE3FQMBDFJO1BDLBHF
   w ݟͳ͔ͬͨ͜ͱʹ͢Δ
   

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10. 'JOEBOE3FQMBDFJO1BDLBHF
    

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11. 'JOEBOE3FQMBDFJO1BDLBHF
    w Ұݟྑͦ͞͏ʹݟ͑Δ͕
    w ͤʔͷͰҰ੪ʹॻ͖׵ΘΔ
    w ໢ཏੑ͸େৎ෉ʁ
    w ౰֘GVODUJPOҎ֎ʹಉ͡UZQP͕͋ͬͨ࣌ͦͬͪ΋มΘΔ
    w ςετ͖͠ΕΔʁ
    w UZQPΛमਖ਼ͨ݁͠ՌผͷGVODUJPOͱඃͬͨ
    w ҙਤͤ͵όάͷ஀ੜ
    🤔
    

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12. 'JOEBOE3FQMBDFJO1BDLBHF
    // A.swift
    
    
    func doSomesing() {
    
    
    // do something
    
    
    }
    
    
    // C.swift
    
    
    func doSomething(with foo: Foo = .init()) {
    
    
    // do something with `foo`
    
    
    }
    // B.swift
    
    
    func call() {
    
    
    doSomesing()
    
    
    }
    
    
    // D.swift
    
    
    func callWithFoo() {
    
    
    doSomething()
    
    
    }
    

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13. 'JOEBOE3FQMBDFJO1BDLBHF
    // A.swift
    
    
    func doSomething() {
    
    
    // do something
    
    
    }
    
    
    // C.swift
    
    
    func doSomething(with foo: Foo = .init()) {
    
    
    // do something with `foo`
    
    
    }
    // B.swift
    
    
    func call() {
    
    
    doSomething()
    
    
    }
    
    
    // D.swift
    
    
    func callWithFoo() {
    
    
    doSomething()
    
    
    }
    😱
    

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14. w मਖ਼͢Δ
    w 3FGBDUPS3FOBNF
    w 'JOEBOE3FQMBDFJO1BDLBHF
    w ݟͳ͔ͬͨ͜ͱʹ͢Δ
    

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15. w मਖ਼͢Δ
    w 3FGBDUPS3FOBNF
    w 'JOEBOE3FQMBDFJO1BDLBHF
    w 6TFABWBJMBCMFABOEAEFQSFDBUFEA
    w ݟͳ͔ͬͨ͜ͱʹ͢Δ
    

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16. BWBJMBCMFʹ͍ͭͯ
    BWBJMBCMFͱ͸
    w ʮಛఆͷ04όʔδϣϯ͔Β࢖͑Δ࢖͑ͳ͘ͳΔʯͱ͍ͬͨ৘ใΛऔΓѻ͏
    BUUSJCVUF
    w Ϗϧυ࣌ʹܯࠂΤϥʔͷܗͰϑΟʔυόοΫͯ͘͠ΕΔ
    

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17. BWBJMBCMFʹ͍ͭͯ
    ओͳΦϓγϣϯ
    w ܯࠂ
    w EFQSFDBUFEඇਪ঑ όʔδϣϯলུՄ
    
    w ϏϧυΤϥʔ
    w PCTPMFUFEഇࢭ όʔδϣϯলུෆՄ
    
    w VOBWBJMBCMFར༻ෆՄ όʔδϣϯࢦఆෆՄ
    
    

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18. BWBJMBCMFʹ͍ͭͯ
    ओͳΦϓγϣϯ
    w ͦͷଞ
    w SFOBNFEϦωʔϜઌͷ"1*GVODUJPO໊
    

    ࢦఆ͢Δͱ9DPEF্ͰαδΣετΑ͠ͳʹஔ׵ͯ͘͠ΕΔ
    w NFTTBHFܯࠂΤϥʔϝοηʔδ
    

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19. BWBJMBCMFEFQSFDBUFEΛ࢖ͬͯUZQPΛमਖ਼
    ϝϦοτ
    w ཁमਖ਼ՕॴͷಛఆΛίϯύΠϥʹؙ౤͛Ͱ͖Δ
    w શ෦ม͑Δඞཁ͕ແ͍ͷͰஈ֊తʹϦϑΝΫλϦϯάΛਐΊΒΕΔ
    w FYվमର৅ʹͳͬͨΒରԠ͢Δ
    w FYςετίʔυͷ͋Δݺͼग़͠ݩ͔ΒରԠ͍ͯ͘͠
    w ӨڹൣғΛ࠷খݶʹ཈͑ΒΕΔ
    

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20. BWBJMBCMFEFQSFDBUFEΛ࢖ͬͯUZQPΛमਖ਼
    σϝϦοτ
    w Өڹൣғ͕ଟ͚Ε͹ଟ͍΄Ͳܯࠂ਺͕૿͑Δ
    w ಉ͡಺༰ͷܯࠂ͕ζϥοͱฒͿ
    w $*ͷग़ྗΛπʔϧͰऔͬͯͨΓ͍ͯ͠Δͱπϥ͍͔΋
    w SFOBNFEͰͷࣗಈม׵͸ҰׅͰͰ͖ͳ͍
    w ·ͱΊͯ΍Ζ͏ͱ͢Δͱෆศ
    

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21. func doSomesing() {
    
    
    // do something
    
    
    }
    

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22. func doSomesing() {
    
    
    doSomething()
    
    
    }
    
    
    func doSomething() {
    
    
    // do something
    
    
    }
    

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23. @available(*, deprecated, renamed: "doSomething()")
    
    
    func doSomesing() {
    
    
    doSomething()
    
    
    }
    
    
    func doSomething() {
    
    
    // do something
    
    
    }
    

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24. View Slide

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26. View Slide

27. Ԡ༻ฤ
    

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28. αϙʔτόʔδϣϯͷؔ܎Ͱ
    ࢖͑ͳ͍"1*Λ࢖͍͍ͨ
    

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29. αϙʔτόʔδϣϯͷؔ܎Ͱ࢖͑ͳ͍"1*
    ˞J04ͷ"QQΛ૝ఆ
    w JGBWBJMBCMFΛ࢖ͬͯ
    w 8PSLBSPVOEͱซ༻͢Δ
    w ্ҐόʔδϣϯͷΈ࢖͑ΔΑ͏ʹ͢Δ
    w FY
    w "UUSJCVUFE4USJOH J04d
    
    w QSFTFOUBUJPO%FUFOUT J04d
    
    

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30. αϙʔτόʔδϣϯͷؔ܎Ͱ࢖͑ͳ͍"1*
    ˞J04ͷ"QQΛ૝ఆ
    w JGBWBJMBCMFΛ࢖ͬͯ
    w 8PSLBSPVOEͱซ༻͢Δ
    w ্ҐόʔδϣϯͷΈ࢖͑ΔΑ͏ʹ͢Δ
    w FY
    w "UUSJCVUFE4USJOH J04d
    
    w QSFTFOUBUJPO%FUFOUT J04d
    
    

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31. "UUSJCVUFE4USJOH
    var attributedString: AttributedString { // ← 'AttributedString' is
    
    
    only available in iOS 15 or newer
    
    
    var str = AttributedString("Foo Bar Baz Qux Quux")
    
    
    if let range = str.range(of: "Bar") {
    
    
    str[range].foregroundColor = .red
    
    
    }
    
    
    if let range = str.range(of: "Baz") {
    
    
    str[range].font = .title
    
    
    }
    
    
    if let range = str.range(of: "Qux") {
    
    
    str[range].font = .footnote
    
    
    str[range].foregroundColor = .green
    
    
    }
    
    
    return str
    
    
    }
    var body: some View {
    
    
    VStack {
    
    
    Text(attributedString) // ← 'init(_:)'
    
    
    is only available in iOS 15.0 or newer
    
    
    }
    
    
    }
    
    
    

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32. "UUSJCVUFE4USJOH
    @available(iOS 15, *)
    
    
    var attributedString: AttributedString {
    
    
    var str = AttributedString("Foo Bar Baz Qux Quux")
    
    
    if let range = str.range(of: "Bar") {
    
    
    str[range].foregroundColor = .red
    
    
    }
    
    
    if let range = str.range(of: "Baz") {
    
    
    str[range].font = .title
    
    
    }
    
    
    if let range = str.range(of: "Qux") {
    
    
    str[range].font = .footnote
    
    
    str[range].foregroundColor = .green
    
    
    }
    
    
    return str
    
    
    }
    var body: some View {
    
    
    VStack {
    
    
    Text(attributedString) // ← 'init(_:)'
    
    
    is only available in iOS 15.0 or newer
    
    
    }
    
    
    }
    
    
    

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33. "UUSJCVUFE4USJOH
    var body: some View {
    
    
    VStack {
    
    
    if #available(iOS 15, *) {
    
    
    Text(attributedString)
    
    
    } else {
    
    
    Text("Foo")
    
    
    + Text(" ")
    
    
    + Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    + Text(" ")
    
    
    + Text("Baz")
    
    
    .font(.title)
    
    
    + Text(" ")
    
    
    + Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    + Text(" ")
    
    
    + Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    @available(iOS 15, *)
    
    
    var attributedString: AttributedString {
    
    
    var str = AttributedString("Foo Bar Baz Qux Quux")
    
    
    if let range = str.range(of: "Bar") {
    
    
    str[range].foregroundColor = .red
    
    
    }
    
    
    if let range = str.range(of: "Baz") {
    
    
    str[range].font = .title
    
    
    }
    
    
    if let range = str.range(of: "Qux") {
    
    
    str[range].font = .footnote
    
    
    str[range].foregroundColor = .green
    
    
    }
    
    
    return str
    
    
    }
    

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34. "UUSJCVUFE4USJOH
    var body: some View {
    
    
    VStack {
    
    
    if #available(iOS 15, *) {
    
    
    Text(attributedString)
    
    
    } else {
    
    
    AttributedText {
    
    
    Text("Foo")
    
    
    Text(" ")
    
    
    Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    Text(" ")
    
    
    Text("Baz")
    
    
    .font(.title)
    
    
    Text(" ")
    
    
    Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    Text(" ")
    
    
    Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    struct AttributedText: View {
    
    
    typealias Body = Text
    
    
    var text: Text
    
    
    init(@Builder builder: () -> Text) {
    
    
    text = builder()
    
    
    }
    
    
    var body: Text {
    
    
    text
    
    
    }
    
    
    }
    
    
    extension AttributedText {
    
    
    @resultBuilder
    
    
    enum Builder { ɾɾɾ }
    
    
    }
    

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35. JGBWBJMBCMFͷपғ͸೥ޙʹ
    ٕज़తෛ࠴ʹͳΔ͜ͱ͕֬ఆ͍ͯ͠Δ
    🤔
    

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36. Ͱ΋೥ޙʹ֮͑ͯΔอূ͸ແ͍
    😅
    

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37. "UUSJCVUFE4USJOH
    ໿ଋ͞Εٕͨज़తෛ࠴Λ຤୅·Ͱ͓֮͑ͯͨ͘Ίʹ
    var body: some View {
    
    
    VStack {
    
    
    AttributedText {
    
    
    Text("Foo")
    
    
    Text(" ")
    
    
    Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    Text(" ")
    
    
    Text("Baz")
    
    
    .font(.title)
    
    
    Text(" ")
    
    
    Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    Text(" ")
    
    
    Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    struct AttributedText: View {
    
    
    typealias Body = Text
    
    
    var text: Text
    
    
    init(@Builder builder: () -> Text) {
    
    
    text = builder()
    
    
    }
    
    
    var body: Text {
    
    
    text
    
    
    }
    
    
    }
    
    
    extension AttributedText {
    
    
    @resultBuilder
    
    
    enum Builder { ɾɾɾ }
    
    
    }
    

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38. "UUSJCVUFE4USJOH
    .JOJNVN%FQMPZNFOU5BSHFU͕ҎԼͷؒ͸ܯࠂ͕ग़ͳ͍
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    struct AttributedText: View {
    
    
    typealias Body = Text
    
    
    var text: Text
    
    
    init(@Builder builder: () -> Text) {
    
    
    text = builder()
    
    
    }
    
    
    var body: Text {
    
    
    text
    
    
    }
    
    
    }
    
    
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    extension AttributedText {
    
    
    @resultBuilder
    
    
    enum Builder { ɾɾɾ }
    
    
    }
    var body: some View {
    
    
    VStack {
    
    
    AttributedText {
    
    
    Text("Foo")
    
    
    Text(" ")
    
    
    Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    Text(" ")
    
    
    Text("Baz")
    
    
    .font(.title)
    
    
    Text(" ")
    
    
    Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    Text(" ")
    
    
    Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    

    View Slide

39. "UUSJCVUFE4USJOH
    .JOJNVN%FQMPZNFOU5BSHFUΛʹͨ͠Βܯࠂ͕ग़Δ
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    struct AttributedText: View {
    
    
    typealias Body = Text
    
    
    var text: Text
    
    
    init(@Builder builder: () -> Text) {
    
    
    text = builder()
    
    
    }
    
    
    var body: Text {
    
    
    text
    
    
    }
    
    
    }
    
    
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    extension AttributedText {
    
    
    @resultBuilder
    
    
    enum Builder { ɾɾɾ }
    
    
    }
    var body: some View {
    
    
    VStack {
    
    
    AttributedText { // ←
    'AttributedText' was deprecated in iOS
    15.0: Use `Text` with `AttributedString`
    
    
    Text("Foo")
    
    
    Text(" ")
    
    
    Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    Text(" ")
    
    
    Text("Baz")
    
    
    .font(.title)
    
    
    Text(" ")
    
    
    Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    Text(" ")
    
    
    Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    

    View Slide

40. "UUSJCVUFE4USJOH
    .JOJNVN%FQMPZNFOU5BSHFUΛʹͨ͠ΒϏϧυΤϥʔʹ
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    struct AttributedText: View {
    
    
    typealias Body = Text
    
    
    var text: Text
    
    
    init(@Builder builder: () -> Text) {
    
    
    text = builder()
    
    
    }
    
    
    var body: Text {
    
    
    text
    
    
    }
    
    
    }
    
    
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    extension AttributedText {
    
    
    @resultBuilder
    
    
    enum Builder { ɾɾɾ }
    
    
    }
    var body: some View {
    
    
    VStack {
    
    
    AttributedText { // ←
    'AttributedText' is unavailable in iOS:
    Use `Text` with `AttributedString`
    
    
    Text("Foo")
    
    
    Text(" ")
    
    
    Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    Text(" ")
    
    
    Text("Baz")
    
    
    .font(.title)
    
    
    Text(" ")
    
    
    Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    Text(" ")
    
    
    Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    

    View Slide

41. "UUSJCVUFE4USJOH
    JGBWBJMBCMF
    \^FMTF\^ͰׅΒΕΔͱܯࠂ͕ग़ͳ͍
    var body: some View {
    
    
    VStack {
    
    
    if #available(iOS 15, *) {
    
    
    Text(attributedString)
    
    
    } else {
    
    
    AttributedText {
    
    
    Text("Foo")
    
    
    Text(" ")
    
    
    Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    Text(" ")
    
    
    Text("Baz")
    
    
    .font(.title)
    
    
    Text(" ")
    
    
    Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    Text(" ")
    
    
    Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    struct AttributedText: View {
    
    
    typealias Body = Text
    
    
    var text: Text
    
    
    init(@Builder builder: () -> Text) {
    
    
    text = builder()
    
    
    }
    
    
    var body: Text {
    
    
    text
    
    
    }
    
    
    }
    
    
    @available(iOS, deprecated: 15.0, obsoleted: 16.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    extension AttributedText {
    
    
    @resultBuilder
    
    
    enum Builder { ɾɾɾ }
    
    
    }
    

    View Slide

42. var body: some View {
    
    
    VStack {
    
    
    if #available(iOS 15, *) {
    
    
    Text(attributedString)
    
    
    } else {
    
    
    AttributedText { // ←
    'AttributedText' is unavailable in iOS: Use
    `Text` with `AttributedString`
    
    
    Text("Foo")
    
    
    Text(" ")
    
    
    Text("Bar")
    
    
    .foregroundColor(.red)
    
    
    Text(" ")
    
    
    Text("Baz")
    
    
    .font(.title)
    
    
    Text(" ")
    
    
    Text("Qux")
    
    
    .font(.footnote)
    
    
    .foregroundColor(.green)
    
    
    Text(" ")
    
    
    Text("Quux")
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    "UUSJCVUFE4USJOH
    PCTPMFUFEʹ͢ΔͱΤϥʔʹͳΔ
    @available(iOS, obsoleted: 15.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    struct AttributedText: View {
    
    
    typealias Body = Text
    
    
    var text: Text
    
    
    init(@Builder builder: () -> Text) {
    
    
    text = builder()
    
    
    }
    
    
    var body: Text {
    
    
    text
    
    
    }
    
    
    }
    
    
    @available(iOS, obsoleted: 15.0,
    
    
    message: "Use `Text` with `AttributedString`")
    
    
    extension AttributedText {
    
    
    @resultBuilder
    
    
    enum Builder { ɾɾɾ }
    
    
    }
    

    View Slide

43. αϙʔτόʔδϣϯͷؔ܎Ͱ࢖͑ͳ͍"1*
    ˞J04ͷ"QQΛ૝ఆ
    w JGBWBJMBCMFΛ࢖ͬͯ
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    w "UUSJCVUFE4USJOH J04d
    
    w QSFTFOUBUJPO%FUFOUT J04d
    
    

    View Slide

44. QSFTFOUBUJPO%FUFOUT
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    SheetView()
    
    
    .presentationDetents([.medium]) // ← 'presentationDetents' is only available in iOS 16.0 or newer
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    

    View Slide

45. QSFTFOUBUJPO%FUFOUT
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    if #available(iOS 16.0, *) {
    
    
    SheetView()
    
    
    .presentationDetents([.medium])
    
    
    } else {
    
    
    SheetView()
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    

    View Slide

46. QSFTFOUBUJPO%FUFOUT
    GVODUJPOʹ੾Γग़͢
    extension View {
    
    
    @ViewBuilder
    
    
    func halfSheetIfAble(height: CGFloat? = nil) -> some View {
    
    
    if #available(iOS 16.0, *) {
    
    
    if let height {
    
    
    presentationDetents([.height(height)])
    
    
    } else {
    
    
    presentationDetents([.medium])
    
    
    }
    
    
    } else {
    
    
    self
    
    
    }
    
    
    }
    
    
    }
    
    
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    SheetView()
    
    
    .halfSheetIfAble()
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    
    
    

    View Slide

47. QSFTFOUBUJPO%FUFOUT
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    SheetView()
    
    
    .halfSheetIfAble()
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    
    
    @available(iOS, deprecated: 16, message: "Use
    
    
    `presentationDetents` directly.")
    
    
    extension View {
    
    
    @ViewBuilder
    
    
    func halfSheetIfAble(height: CGFloat? = nil) -> some View {
    
    
    if #available(iOS 16.0, *) {
    
    
    if let height {
    
    
    presentationDetents([.height(height)])
    
    
    } else {
    
    
    presentationDetents([.medium])
    
    
    }
    
    
    } else {
    
    
    self
    
    
    }
    
    
    }
    
    
    }
    
    
    

    View Slide

48. QSFTFOUBUJPO%FUFOUT
    .JOJNVN%FQMPZNFOU5BSHFUΛʹ͢Δͱܯࠂ͕ग़Δ
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    SheetView()
    
    
    .halfSheetIfAble() // ←
    'halfSheetIfAble(height:)' was deprecated in iOS
    16: Use `presentationDetents` directly.
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    
    
    @available(iOS, deprecated: 16, message: "Use
    
    
    `presentationDetents` directly.")
    
    
    extension View {
    
    
    @ViewBuilder
    
    
    func halfSheetIfAble(height: CGFloat? = nil) -> some View {
    
    
    if #available(iOS 16.0, *) {
    
    
    if let height {
    
    
    presentationDetents([.height(height)])
    
    
    } else {
    
    
    presentationDetents([.medium])
    
    
    }
    
    
    } else {
    
    
    self
    
    
    }
    
    
    }
    
    
    }
    
    
    

    View Slide

49. QSFTFOUBUJPO%FUFOUT
    ผղಉ໊ͷCBDLQPSUGVODUJPOΛ༻ҙ͢Δ
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    SheetView()
    
    
    .presentationDetents([.medium])
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    @available(iOS, obsoleted: 16, message: "Use `presentationDetents` in SwiftUI
    directly.")
    
    
    extension View {
    
    
    @ViewBuilder
    
    
    func presentationDetents(_ detents: Set) -> some View {
    
    
    if #available(iOS 16.0, *) {
    
    
    presentationDetents(Set(detents.map(\.detent)))
    
    
    } else {
    
    
    self
    
    
    }
    
    
    }
    
    
    }
    
    
    /// Backporting for `SwiftUI.PresentationDetent`
    
    
    enum PresentationDetent: Hashable {
    
    
    ɾɾɾ
    
    
    }
    
    
    @available(iOS 16.0, *)
    
    
    extension PresentationDetent {
    
    
    var detent: SwiftUI.PresentationDetent {
    
    
    switch self {
    
    
    case .medium: return .medium
    
    
    ɾɾɾ
    
    
    }
    
    
    }
    
    
    }
    

    View Slide

50. QSFTFOUBUJPO%FUFOUT
    .JOJNVN%FQMPZNFOU5BSHFUΛʹ͢ΔͱϏϧυΤϥʔ
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    SheetView()
    
    
    .presentationDetents([.medium]) /
    / ← Ambiguous use of 'medium'
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    @available(iOS, deprecated: 16, message: "Use `presentationDetents` in SwiftUI
    directly.")
    
    
    extension View {
    
    
    @ViewBuilder
    
    
    func presentationDetents(_ detents: Set) -> some View {
    
    
    if #available(iOS 16.0, *) {
    
    
    presentationDetents(Set(detents.map(\.detent)))
    
    
    } else {
    
    
    self
    
    
    }
    
    
    }
    
    
    }
    
    
    /// Backporting for `SwiftUI.PresentationDetent`
    
    
    enum PresentationDetent: Hashable {
    
    
    ɾɾɾ
    
    
    }
    
    
    @available(iOS 16.0, *)
    
    
    extension PresentationDetent {
    
    
    var detent: SwiftUI.PresentationDetent {
    
    
    switch self {
    
    
    case .medium: return .medium
    
    
    ɾɾɾ
    
    
    }
    
    
    }
    
    
    }
    

    View Slide

51. QSFTFOUBUJPO%FUFOUT
    CBDLQPSUGVODUJPOΛফͤ͹ܯࠂ΋ফ͑Δ
    struct ContentView: View {
    
    
    @State private var isPresenting = false
    
    
    var body: some View {
    
    
    VStack {
    
    
    Button {
    
    
    isPresenting = true
    
    
    } label: {
    
    
    VStack {
    
    
    Image(systemName: "globe")
    
    
    .imageScale(.large)
    
    
    Text("Hello, world!")
    
    
    }.foregroundColor(.accentColor)
    
    
    .padding()
    
    
    }
    
    
    .sheet(isPresented: $isPresenting) {
    
    
    SheetView()
    
    
    .presentationDetents([.medium])
    
    
    }
    
    
    }
    
    
    }
    
    
    }
    //@available(iOS, obsoleted: 16, message: "Use `presentationDetents` in SwiftUI
    directly.")
    
    
    //extension View {
    
    
    // @ViewBuilder
    
    
    // func presentationDetents(_ detents: Set) -> some View {
    
    
    // if #available(iOS 16.0, *) {
    
    
    // presentationDetents(Set(detents.map(\.detent)))
    
    
    // } else {
    
    
    // self
    
    
    // }
    
    
    // }
    
    
    //}
    
    
    //
    
    
    ///// Backporting for `SwiftUI.PresentationDetent`
    
    
    //enum PresentationDetent: Hashable {
    
    
    // ɾɾɾ
    
    
    //}
    
    
    //
    
    
    //@available(iOS 16.0, *)
    
    
    //extension PresentationDetent {
    
    
    // var detent: SwiftUI.PresentationDetent {
    
    
    // switch self {
    
    
    // case .medium: return .medium
    
    
    // ɾɾɾ
    
    
    // }
    
    
    // }
    
    
    //}
    

    View Slide

52. ·ͱΊ
    w BWBJMBCMFͱEFQSFDBUFEΛ࢖͏͜ͱͰӨڹൣғΛߜͬͨϦϑΝΫλϦϯά͕
    Մೳ
    w ͤʔͷͰ΍ΔΑΓ҆શ
    w ର৅͸ίϯύΠϥ͕ܯࠂΤϥʔʹͯ͘͠ΕΔͷͰQBTTJWFʹಈ͚Δ
    w SFNJOEFSతͳ໾ׂΛՌͨ͢
    w ݟམͱ͕͠ݮΔͷͰޮ཰61
    

    View Slide

53. 'JO
    IUUQTHJUIVCDPN,*4XJGU"WBJMBCMF4BNQMF
    

    View Slide