あらゆる情報を 楽に正しく String にフォーマットする 〜令和2021年から脱却せよ〜 / Easily and correctly format any information into a String

あらゆる情報を
楽に正しく String にフォーマットする 〜令和2021年から脱却せよ〜 / Easily and correctly format any information into a String

iOSDC Japan 2021　
Day 2
2021/09/19 11:30〜 Track D レギュラートーク（40分）
https://fortee.jp/iosdc-japan-2021/proposal/fa01a205-29bd-413d-8ba8-257555d4c7d0

https://www.youtube.com/watch?v=otyiNlEAeRI

Transcript

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6. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 6
7. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 7 Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved.
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13. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 13 ? ? ? ? ? ? Date String
14. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 14 NumberFormatter | Apple Developer Documentation
15. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ͋ͳ͕ͨ஌͍ͬͯΔ
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16. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ͜ͷηογϣϯͰ෼͔Δ͜ͱ $POUFOUT w ͳͥ
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17. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ͳͥ
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18. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ಠ࣮ࣗ૷͕ෆཁͰ͋Δ /P
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    w ܻ͓͖ʹʮ ʯΛೖΕΔ 18 // 1000 ͷͱ͖͸ "1,000" // 1000000 ͷͱ͖͸ "1,000,000" // 3141.59 ͷͱ͖͸ "3,141.59"
19. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ಠ࣮ࣗ૷͕ෆཁͰ͋Δ /P
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    w ܻ͓͖ʹʮ ʯΛೖΕΔ 19 let formatter = NumberFormatter() formatter.numberStyle = .decimal print(formatter.string(from: 1521)) // Optional("1,521")
20. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ಠ࣮ࣗ૷͕ෆཁͰ͋Δ /P
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23. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ϩʔΧϥΠζͷαϙʔτ 4VQQPSU
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24. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ͜ͷηογϣϯͰ෼͔Δ͜ͱ $POUFOUT w ͳͥ
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    BWBJMBCMF 25 /// A type that can convert a given data type into a representation. @available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) public protocol FormatStyle : Decodable, Encodable, Hashable
26. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 'PSNBU4UZMF /P
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    BWBJMBCMF 26 let formatter = NumberFormatter() formatter.numberStyle = .decimal print(formatter.string(from: 1521)) // Optional("1,521") print(1521.formatted()) // "1,521"
27. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 'PSNBU4UZMF /P
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    BWBJMBCMF 27 struct ContentView: View { var body: some View { // Formatted Number: 1,521 Text("Formatted Number: \(1521.formatted())") } }
28. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ͜ͷηογϣϯͰ෼͔Δ͜ͱ $POUFOUT w ͳͥ
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29. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 'PSNBU
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30. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 30 123
31. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 31 Formatters 40 1 Numbers & Currency Integer ੔਺ 123 1234
32. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ੔਺ *OUFHFS w ਺ࣈΛ੔਺ʹͨ͠
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    w ࢛ࣺޒೖɺ੾Γࣺͯɾ੾Γ্͛ͳͲͷΦϓγϣϯ 32 let formatter = NumberFormatter() formatter.numberStyle = .none print(formatter.string(from: 1234.5678)) // Optional("1235") formatter.roundingMode = .down print(formatter.string(from: 1234.5678)) // Optional("1234")
33. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 33 1,000 Formatters 40 2 Decimal Numbers & Currency ਐ਺ 123
34. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ਐ਺ %FDJNBM w ਺ࣈΛਐ਺දهʹͨ͠
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35. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ਐ਺ %FDJNBM 35 let formatter = NumberFormatter() formatter.numberStyle = .decimal print(formatter.string(from: 1234.5678)) // Optional("1,234.568") print(formatter.groupingSize) // 3 print(formatter.groupingSeparator) // Optional(",") print(formatter.decimalSeparator) // Optional(".") formatter.formatWidth = 5 print(formatter.string(from: 1)) // Optional(" 1") print(formatter.string(from: 12)) // Optional(" 12") print(formatter.string(from: 123)) // Optional(" 123") print(formatter.string(from: 1234)) // Optional("1,234") formatter.maximumSignificantDigits = 5 print(formatter.string(from: 1234.5678)) // Optional("1,234.6")
36. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 36 50% Formatters 40 3 Percent ύʔηϯτʢඦ෼཰ʣ Numbers & Currency 123
37. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ύʔηϯτʢඦ෼཰ʣ 1FSDFOU 37 let formatter = NumberFormatter() formatter.numberStyle = .percent print(formatter.string(from: 0.1)) // Optional("10%") print(formatter.string(from: 0.05)) // Optional("5%") print(formatter.string(from: -0.28)) // Optional("-28%") formatter.locale = Locale(identifier: "ar_EG") print(formatter.string(from: 0.01)) // Optional("١٪") print(formatter.percentSymbol) // Optional("٪") formatter.locale = Locale(identifier: "ja_JP") formatter.percentSymbol = "ύʔηϯτ" print(formatter.string(from: 0.03)) // Optional("3ύʔηϯτ") // available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) print(0.02.formatted(.percent)) // 2%
38. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 38 1.62E2 Formatters 40 4 Scientific Պֶʢࢦ਺ʣදه
    Numbers & Currency 123
39. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. Պֶʢࢦ਺ʣදه
    4DJFOUJ fi D 39 let formatter = NumberFormatter() formatter.numberStyle = .scientific print(formatter.string(from: 162)) // Optional("1.62E2") formatter.exponentSymbol = "e" print(formatter.string(from: 31.4)) // Optional("3.14e1")
40. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 40 two thousand 
 twenty-one Formatters 40 5 Spell Out ௲Γ Numbers & Currency 123
41. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ௲Γ 4QFMM
    0VU 41 let formatter = NumberFormatter() formatter.numberStyle = .spellOut formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: 162)) // Optional("ඦ࿡ेೋ") print(formatter.string(from: 31.4)) // Optional("ࡾेҰɾ࢛") print(formatter.string(from: -256)) // Optional("ϚΠφεೋඦޒे࿡") formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: 162)) // Optional("one hundred sixty-two") print(formatter.string(from: 31.4)) // Optional("thirty-one point four") print(formatter.string(from: -256)) // Optional("minus two hundred fifty-six")
42. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 42 1st Formatters 40 6 Ordinal ং਺ Numbers & Currency 123
43. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ং਺ 0SEJOBM 43 let formatter = NumberFormatter() formatter.numberStyle = .ordinal formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: 1)) // Optional("1st") print(formatter.string(from: 2)) // Optional("2nd") print(formatter.string(from: 3)) // Optional("3rd") print(formatter.string(from: 4)) // Optional("4th") formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: 1)) // Optional("ୈ1") print(formatter.string(from: 2)) // Optional("ୈ2") print(formatter.string(from: 3)) // Optional("ୈ3") print(formatter.string(from: 4)) // Optional("ୈ4")
44. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 44 ¥1,538 Formatters 40 7 Currency ௨՟ Numbers & Currency
45. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ௨՟ $VSSFODZ 45 let formatter = NumberFormatter() formatter.numberStyle = .currency formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: 100)) // Optional("¥100") formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: 100)) // Optional("$100.00") formatter.locale = Locale(identifier: "zh_HK") print(formatter.string(from: 100)) // Optional("HK$100.00") formatter.maximumFractionDigits = 0 print(formatter.string(from: 100)) // Optional("HK$100") // available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) print(120.formatted(.currency(code: "JPY"))) // ¥120
46. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 46 Formatters 40 8 Currency Plural ௨՟ʢ୯Ґෳ਺ܗରԠʣ Numbers & Currency 226.78 
 US dollars
47. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ௨՟ʢ୯Ґෳ਺ܗରԠʣ $VSSFODZ
    1MVSBM 47 let formatter = NumberFormatter() formatter.numberStyle = .currencyPlural formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: 100)) // Optional("100 ԁ") formatter.locale = Locale(identifier: "en_JP") print(formatter.string(from: 100)) // Optional("100 Japanese yen") formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: 100)) // Optional("100.00 US dollars") formatter.locale = Locale(identifier: "zh_HK") print(formatter.string(from: 100)) // Optional("100.00 ߓݩ") formatter.locale = Locale(identifier: "en_HK") print(formatter.string(from: 100)) // Optional("100.00 Hong Kong dollars")
48. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 48 JPY 1,538 Formatters 40 9 Currency 
 ISO Code ௨՟ίʔυ Numbers & Currency
49. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ௨՟ίʔυ $VSSFODZ
    *40
    $PEF 49 let formatter = NumberFormatter() formatter.numberStyle = .currencyISOCode formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: 100)) // Optional("JPY 100") formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: 100)) // Optional("USD 100.00") formatter.locale = Locale(identifier: "en_GB") print(formatter.string(from: 100)) // Optional("GBP 100.00") formatter.locale = Locale(identifier: "zh_HK") print(formatter.string(from: 100)) // Optional("HKD 100.00")
50. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 50 ( ¥1,538 ) Formatters 40 10 Currency Accounting ձܭ Numbers & Currency
51. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ձܭ $VSSFODZ
    "DDPVOUJOH 51 let formatter = NumberFormatter() formatter.numberStyle = .currencyAccounting print(formatter.string(from: 1537)) // Optional("¥1,537") print(formatter.string(from: -1537)) // Optional("(¥1,537)") print(formatter.negativePrefix) // Optional("(¥") print(formatter.negativeSuffix) // Optional(")") formatter.negativePrefix = "△" formatter.negativeSuffix = "" print(formatter.string(from: -1200)) // Optional("△1,200")
52. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 52 Formatters 40 11 Person’s Name Names ਓͷ໊લ AI ࢁా क ु จ
53. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ਓͷ໊લ 1FSTPO`T
    /BNF 53 let formatter = PersonNameComponentsFormatter() var nameComponents = PersonNameComponents() nameComponents.familyName = "Tanaka" nameComponents.givenName = "Ryoga" nameComponents.nickname = "treastrain" formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: nameComponents)) // Ryoga Tanaka formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: nameComponents)) // Tanaka Ryoga formatter.style = .abbreviated print(formatter.string(from: nameComponents)) // TR // available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) print(nameComponents.formatted()) // Tanaka Ryoga print(nameComponents.formatted(.name(style: .short))) // treastrain print(nameComponents.formatted(.name(style: .medium))) // Tanaka Ryoga print(nameComponents.formatted(.name(style: .long))) // Tanaka Ryoga print(nameComponents.formatted(.name(style: .abbreviated))) // TR
54. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ਓͷ໊લ 1FSTPO`T
    /BNF 54 let formatter = PersonNameComponentsFormatter() var nameComponents = PersonNameComponents() nameComponents.familyName = "ᖂᖒ" nameComponents.givenName = "ᒇҰ" nameComponents.nameSuffix = "ઌੜ" nameComponents.nickname = "͍͑ͪΌΜ" formatter.style = .abbreviated print(formatter.string(from: nameComponents)) // ᖂᖒ formatter.style = .short print(formatter.string(from: nameComponents)) // ͍͑ͪΌΜ formatter.style = .medium print(formatter.string(from: nameComponents)) // ᖂᖒᒇҰ formatter.style = .long print(formatter.string(from: nameComponents)) // ᖂᖒᒇҰઌੜ // available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) print(nameComponents.formatted()) // ᖂᖒᒇҰ
55. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ਓͷ໊લ 1FSTPO`T
    /BNF 55 let formatter = PersonNameComponentsFormatter() var components = formatter.personNameComponents(from: "וম͞Μ ଠ࿠") print(components?.familyName) // Optional("וম͞Μ") print(components?.middleName) // nil print(components?.givenName) // Optional("ଠ࿠") components = formatter.personNameComponents(from: "John Appleseed") print(components?.familyName) // Optional("Appleseed") print(components?.middleName) // nil print(components?.givenName) // Optional("John") // iOSDC Japan 2020 - Day 0 - Track B // ͋ͳͨͷ஌Βͳ͍࿈བྷઌͷੈք by ೔޲ڧ / coffeegyunyu // Λͥͻࢀর͍ͩ͘͞
56. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 56 2021/09/19 11 : 30 : 00 Formatters 40 12 Dates Dates & Times ೔࣌
57. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ೔࣌ %BUFT 57 let date = Date(timeIntervalSince1970: 1632018600) let formatter = DateFormatter() formatter.dateStyle = .medium formatter.timeStyle = .short formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: date)) // 2021/09/19 11:30 formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: date)) // Sep 19, 2021 at 11:30 AM formatter.locale = Locale(identifier: "zh_HK") print(formatter.string(from: date)) // 2021೥9݄19೔ ্ޕ11:30 // available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) print(date.formatted(date: .complete, time: .shortened)) // 2021೥9݄19೔ ೔༵೔ 11:30
58. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ೔࣌ %BUFT 58 let date = Date(timeIntervalSince1970: 1632018600) let formatter = DateFormatter() formatter.locale = Locale(identifier: "ja_JP") formatter.calendar = Calendar(identifier: .japanese) formatter.dateFormat = "GyMMM" print(formatter.string(from: date)) // ྩ࿨39݄ formatter.locale = Locale(identifier: "en_US") formatter.calendar = Calendar(identifier: .gregorian) formatter.dateFormat = "GyMMM" print(formatter.string(from: date)) // AD2021Sep
59. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 59 ˞࣮ࡍͷݪҼʹ͍ͭͯ͸ෆ໌Ͱ͢ɻ 
 ˞ݱࡏ͸मਖ਼͞Ε͍ͯ·͢ɻ
60. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ೔࣌ %BUFT 60 let date = Date(timeIntervalSince1970: 1632018600) let formatter = DateFormatter() formatter.locale = Locale(identifier: "ja_JP") formatter.calendar = Calendar(identifier: .japanese) formatter.setLocalizedDateFormatFromTemplate("GyMMM") print(formatter.string(from: date)) // ྩ࿨3೥9݄ formatter.locale = Locale(identifier: "en_US") formatter.calendar = Calendar(identifier: .gregorian) formatter.setLocalizedDateFormatFromTemplate("GyMMM") print(formatter.string(from: date)) // Sep 2021 AD
61. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 61 2 days, 
 1 hr, 50 min Formatters 40 13 Quantities of Time Dates & Times ࣌ؒ
62. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ࣌ؒ 2VBOUJUJFT
    PG
    5JNF 62 // ͸΍Ϳ͞44߸ ৽വؗ๺ే~౦ژ ॴཁ࣌ؒ let components = DateComponents(hour: 3, minute: 58) let formatter = DateComponentsFormatter() formatter.calendar?.locale = Locale(identifier: "ja_JP") formatter.unitsStyle = .positional print(formatter.string(from: components)) // Optional("3:58") formatter.unitsStyle = .abbreviated print(formatter.string(from: components)) // Optional("3࣌ؒ58෼") formatter.unitsStyle = .spellOut print(formatter.string(from: components)) // Optional("ࡾ࣌ؒ ޒेീ෼") formatter.calendar?.locale = Locale(identifier: "en_US") formatter.unitsStyle = .positional print(formatter.string(from: components)) // Optional("3:58") formatter.unitsStyle = .abbreviated print(formatter.string(from: components)) // Optional("3h 58m") formatter.unitsStyle = .spellOut print(formatter.string(from: components)) // Optional("three hours, fifty-eight minutes")
63. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 63 2 days ago Formatters 40 14 Relative 
 Date or Time Dates & Times ૬ରతͳ೔࣌
64. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ૬ରతͳ೔࣌ 3FMBUJWF
    %BUF
    PS
    5JNF 64 let formatter = RelativeDateTimeFormatter() formatter.dateTimeStyle = .numeric print(formatter.localizedString(from: DateComponents(month: -1))) // 1 ͔݄લ print(formatter.localizedString(from: DateComponents(month: 0))) // 0 ͔݄ޙ print(formatter.localizedString(from: DateComponents(month: 1))) // 1 ͔݄ޙ formatter.dateTimeStyle = .named print(formatter.localizedString(from: DateComponents(month: -1))) // ઌ݄ print(formatter.localizedString(from: DateComponents(month: 0))) // ࠓ݄ print(formatter.localizedString(from: DateComponents(month: 1))) // དྷ݄
65. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ૬ରతͳ೔࣌ 3FMBUJWF
    %BUF
    PS
    5JNF 65 let formatter = RelativeDateTimeFormatter() formatter.dateTimeStyle = .named print(formatter.localizedString(from: DateComponents(day: -3))) // 3 ೔લ print(formatter.localizedString(from: DateComponents(day: -2))) // Ұࡢ೔ print(formatter.localizedString(from: DateComponents(day: -1))) // ࡢ೔ print(formatter.localizedString(from: DateComponents(day: 0))) // ࠓ೔ print(formatter.localizedString(from: DateComponents(day: 1))) // ໌೔ print(formatter.localizedString(from: DateComponents(day: 2))) // ໌ޙ೔ print(formatter.localizedString(from: DateComponents(day: 3))) // 3 ೔ޙ
66. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 66 Fri, Sep 17, 
 2021 17 : 00 
 – 
 Sun, Sep 19, 
 2021 18 : 50 Formatters 40 15 Time Intervals Dates & Times ִ࣌ؒؒ
67. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ִ࣌ؒؒ 5JNF
    *OUFSWBMT 67 let startDate = Date(timeIntervalSince1970: 1631865600) let endDate = Date(timeIntervalSince1970: 1632045000) let formatter = DateIntervalFormatter() formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: startDate, to: endDate)) // 9/17/21, 5:00 PM – 9/19/21, 6:50 PM formatter.locale = Locale(identifier: "zh_HK") print(formatter.string(from: startDate, to: endDate)) // 17/9/2021 Լޕ5:00ࢸ19/9/2021 Լޕ6:50 formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: startDate, to: endDate)) // 2021/09/17 17:00ʙ2021/09/19 18:50 formatter.dateTemplate = "EEE, MMM d, ''yyyy" print(formatter.string(from: startDate, to: endDate)) // 2021೥9݄17೔(ۚ)ʙ19೔(೔)
68. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 68 2021 - 09 - 19 
 T11 : 30 : 00 + 09 : 00 Formatters 40 16 ISO 8601 Format Dates & Times *40
    
    ܗࣜͷ೔࣌
69. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. *40
    
    ܗࣜͷ೔࣌ *40
    
    'PSNBU 69 let date = Date(timeIntervalSince1970: 1632018600) let formatter = ISO8601DateFormatter() print(formatter.string(from: date)) // 2021-09-19T02:30:00Z formatter.timeZone = TimeZone(identifier: "Asia/Tokyo") print(formatter.string(from: date)) // 2021-09-19T11:30:00+09:00 // available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) print(date.formatted(.iso8601)) // 2021-09-19T02:30:00Z
70. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 70 31.25 GB Formatters 40 17 Data Sizes Data Sizes σʔλαΠζ
71. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. σʔλαΠζ %BUB
    4J[FT 71 // Xcode 12.5.1 ͷαΠζ: 29,509,386,405όΠτ let byteCount: Int64 = 29509386405 let formatter = ByteCountFormatter() formatter.countStyle = .file print(formatter.string(fromByteCount: byteCount)) // 29.51 GB formatter.countStyle = .memory print(formatter.string(fromByteCount: byteCount)) // 27.48 GB formatter.countStyle = .file formatter.allowedUnits = .useMB print(formatter.string(fromByteCount: byteCount)) // 29,509.4 MB // available(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *) print(byteCount.formatted(.byteCount(style: .file))) // 29.51 GB
72. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 72 631.9 km Formatters 40 18 Length Physical Dimension ௕͞
73. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ௕͞ -FOHUI 73 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var length = Measurement<UnitLength>(value: 900, unit: .meters) print(formatter.string(from: length)) // 0.9 km length = length + Measurement<UnitLength>(value: 631, unit: .kilometers) print(formatter.string(from: length)) // 631.9 km formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: length)) // 392.644 mi
74. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 74 15.11 km² Formatters 40 19 Area Physical Dimension ໘ੵ
75. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ໘ੵ "SFB 75 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var area = Measurement<UnitArea>(value: 15.11, unit: .squareKilometers) print(formatter.string(from: area)) // 15.11 km² area.convert(to: .ares) formatter.unitOptions = .providedUnit print(formatter.string(from: area)) // 151,100 a
76. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. l௕͞zΛ࢖ͬͯ໘ੵ͸ٻΊΒΕΔ͔ʁ /P 76 let length1 = Measurement<UnitLength>(value: 10, unit: .meters) let length2 = Measurement<UnitLength>(value: 20, unit: .meters) let length3 = length1 + length2 // 30 m // Binary operator '*' cannot be applied to two 'Measurement<UnitLength>' operands // let length4 = length1 * length2 let length5 = 5 * length1 // 50 m
77. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 77 525 ml Formatters 40 20 Volume Physical Dimension ମੵ
78. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ମੵ 7PMVNF 78 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") let volume1 = Measurement<UnitVolume>(value: 525, unit: .milliliters) print(formatter.string(from: volume1)) // 0.525 L formatter.unitOptions = .providedUnit var volume2 = Measurement<UnitVolume>(value: 1, unit: .gallons) print(formatter.string(from: volume2)) // 1 gal volume2.convert(to: .imperialGallons) print(formatter.string(from: volume2)) // 0.833 gal Imp.
79. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 79 1.047 rad Formatters 40 21 Angle Physical Dimension ֯౓
80. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ֯౓ "OHMF 80 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var angle = Measurement<UnitAngle>(value: 60, unit: .degrees) print(formatter.string(from: angle)) // 60౓ angle.convert(to: .radians) print(formatter.string(from: angle)) // 1.047 rad
81. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 81 0.187 kg Formatters 40 22 Mass Mass, Weight & Force ࣭ྔ
82. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 82 1,013.25 hPa Formatters 40 23 Pressure Mass, Weight & Force ѹྗ
83. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ࣭ྔɾѹྗ .BTT
    
    1SFTTVSF 83 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") let mass = Measurement<UnitMass>(value: 187, unit: .grams) print(formatter.string(from: mass)) // 0.187 kg let pressure = Measurement<UnitPressure>(value: 1013.25, unit: .hectopascals) print(formatter.string(from: pressure)) // 1,013.25 hPa
84. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 84 9.81 m/s² Formatters 40 24 Acceleration Time & Motion Ճ଎౓
85. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. Ճ଎౓ "DDFMFSBUJPO 85 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var acceleration = Measurement<UnitAcceleration>(value: 1, unit: .gravity) // 1 G print(formatter.string(from: acceleration)) acceleration.convert(to: .metersPerSecondSquared) print(formatter.string(from: acceleration)) // 9.81 m/s²
86. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 86 3.967 hr Formatters 40 25 Duration Time & Motion ܧଓ࣌ؒ
87. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 87 50 Hz Formatters 40 26 Frequency Time & Motion प೾਺
88. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ܧଓ࣌ؒɾप೾਺ %VSBUJPO
    
    'SFRVFODZ 88 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var duration = Measurement<UnitDuration>(value: 1, unit: .hours) duration = duration + Measurement<UnitDuration>(value: 30, unit: .minutes) print(formatter.string(from: duration)) // 5,400ඵ duration.convert(to: .hours) formatter.unitOptions = .providedUnit print(formatter.string(from: duration)) // 1.5࣌ؒ let frequency = Measurement<UnitFrequency>(value: 50, unit: .hertz) print(formatter.string(from: frequency)) // 50 Hz
89. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 89 320 km/h Formatters 40 27 Speed Time & Motion ଎͞
90. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ଎͞ 4QFFE 90 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") let speed = Measurement<UnitSpeed>(value: 320, unit: .kilometersPerHour) print(formatter.string(from: speed)) // 320 km/h formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: speed)) // 198.839 mph
91. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 91 9.8 J Formatters 40 28 Energy Energy, Heat, & Light ΤωϧΪʔ
92. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 92 61 W Formatters 40 29 Power Energy, Heat, & Light ిྗ
93. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ΤωϧΪʔɾిྗ &OFSHZ
    
    1PXFS 93 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var energy = Measurement<UnitEnergy>(value: 418400, unit: .joules) print(formatter.string(from: energy)) // 100 kcal energy.convert(to: .kilowattHours) formatter.unitOptions = .providedUnit print(formatter.string(from: energy)) // 0.116 kWh var power = Measurement<UnitPower>(value: 61, unit: .watts) print(formatter.string(from: power)) // 61 W power.convert(to: .horsepower) print(formatter.string(from: power)) // 0.082അྗ
94. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 94 273.15 K Formatters 40 30 Temperature Energy, Heat, & Light Թ౓
95. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 95 500 lx Formatters 40 Illuminance 31 Energy, Heat, & Light র౓
96. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. Թ౓ɾর౓ 5FNQFSBUVSF
    
    *MMVNJOBODF 96 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var temperature = Measurement<UnitTemperature>(value: 273.15, unit: .kelvin) print(formatter.string(from: temperature)) // 0°C temperature.convert(to: .fahrenheit) formatter.unitOptions = .providedUnit print(formatter.string(from: temperature)) // 32°F let illuminance = Measurement<UnitIlluminance>(value: 500, unit: .lux) print(formatter.string(from: illuminance)) // 500 lx
97. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 97 2,815 mAh Formatters 40 32 Electric Charge Electricity ిՙ
98. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 98 500 mA Formatters 40 33 Electric Current Electricity ిྲྀ
99. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 99 141.421 V Formatters 40 34 Electric 
 Potential Difference Electricity ిҐࠩʢిѹʣ
100. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 100 2.4 kΩ Formatters 40 35 Electric Resistance Electricity ిؾ఍߅
101. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ిՙɾిྲྀɾిҐࠩʢిѹʣɾిؾ఍߅ &MFDUSJD
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     3FTJTUBODF 101 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") let q = Measurement<UnitElectricCharge>(value: 2815, unit: .milliampereHours) print(formatter.string(from: q)) // 2,815 mAh let i = Measurement<UnitElectricCurrent>(value: 0.5, unit: .milliamperes) print(formatter.string(from: i)) // 500 mA let e = Measurement<UnitElectricPotentialDifference>(value: 141.421, unit: .volts) print(formatter.string(from: e)) // 141.421 V let r = Measurement<UnitElectricResistance>(value: 2.4, unit: .kiloohms) print(formatter.string(from: r)) // 2,400 Ω
102. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 102 0.154 g/L Formatters 40 36 Concentration of Mass Concentration & Dispersion ࣭ྔೱ౓
103. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 103 410.5 ppm Formatters 40 37 Dispersion Concentration & Dispersion ෼ࢄ
104. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ࣭ྔೱ౓ɾ෼ࢄ $PODFOUSBUJPO
     PG
     .BTT
     
     %JTQFSTJPO 104 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") let concentrationOfMass = Measurement<UnitConcentrationMass>(value: 0.154, unit: .gramsPerLiter) print(formatter.string(from: concentrationOfMass)) // 0.154 g/L let dispersion = Measurement<UnitDispersion>(value: 410.5, unit: .partsPerMillion) print(formatter.string(from: dispersion)) // 410.5 ppm
105. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 105 3.115 L/100km Formatters 40 38 Fuel Efficiency Fuel Efficiency ೩අ
106. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ೩අ 'VFM
     & ff i DJFODZ 106 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") let fuelEfficiency = Measurement<UnitFuelEfficiency>(value: 3.115, unit: .litersPer100Kilometers) print(formatter.string(from: fuelEfficiency)) // 3.115 L/100km
107. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 107 29.104 GiB Formatters 40 39 Amount of Information Data Storage ৘ใྔ
108. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ৘ใྔ "NPVOU
     PG
     *OGPSNBUJPO 108 let formatter = MeasurementFormatter() formatter.locale = Locale(identifier: "ja_JP") var amount = Measurement<UnitInformationStorage>(value: 29.51, unit: .gigabytes) print(formatter.string(from: amount)) // 29.51 GB amount.convert(to: .gigabits) print(formatter.string(from: amount)) // 236.08 Gb let byteCountFormatter = ByteCountFormatter() print(byteCountFormatter.string(from: amount)) // 29.51 GB
109. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 109 iPhone, 
 iPad, 
 and iPod touch Formatters 40 40 Lists Lists Ϧετ
110. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. Ϧετ -JTUT 110 let formatter = ListFormatter() var items = ["ΓΜ͝", "όφφ", "ΦϨϯδ"] formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: items)) // Optional("ΓΜ͝ɺόφφɺΦϨϯδ") items = ["Apple", "Banana", "Orange"] formatter.locale = Locale(identifier: "en_US") print(formatter.string(from: items)) // Optional("Apple, Banana, and Orange")
111. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. Ϧετ -JTUT 111 let formatter = ListFormatter() var items = ["೔ຊޠ", "ӳޠ", "εϖΠϯޠ"] formatter.locale = Locale(identifier: "ja_JP") print(formatter.string(from: items)) // Optional("೔ຊޠɺӳޠɺεϖΠϯޠ") formatter.locale = Locale(identifier: "es_ES") items = ["Japonés", "Inglés", "Español"] print(formatter.string(from: items)) // Optional("Japonés, Inglés y Español") items = ["Japonés", "Español", "Inglés"] print(formatter.string(from: items)) // Optional("Japonés, Español e Inglés")
112. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. Ϧετ -JTUT 112 // ஋ஈҰཡ let items = [120, 250, 370, 490, 610, 730, 860, 980, 1100] let itemFormatter = NumberFormatter() itemFormatter.numberStyle = .currency let formatter = ListFormatter() formatter.itemFormatter = itemFormatter print(formatter.string(from: items)) // Optional("¥120ɺ¥250ɺ¥370ɺ¥490ɺ¥610ɺ¥730ɺ¥860ɺ¥980ɺ¥1,100")
113. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ·ͱΊ $POUFOUT w ͳͥ
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115. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 115 J1IPOF
     ͷྐྵ๏Λʮ࿨ྐྵʯʹ͢Δͱ࠶ݱͰ͖·͢
116. Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂɹɹɹɹɹɹɹɹɹIUUQTUSFUKQɹ⏩ ͋ΒΏΔ৘ใΛ 
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     ʙ 116 iOSDC Japan 2021 
 Day 2 #iosdc #d