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

Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved.
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iOSDC Japan 2021
 
Day 2
#iosdc #d

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Copyright © 2021 treastrain / Tanaka RyogaɹAll rights reserved. 3

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ਓͷ໊લ
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? ? ? ? ? ?
Date
String

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NumberFormatter | Apple Developer Documentation

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// 1000 ͷͱ͖͸ "1,000"

// 1000000 ͷͱ͖͸ "1,000,000"

// 3141.59 ͷͱ͖͸ "3,141.59"

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let formatter = NumberFormatter()

formatter.numberStyle = .decimal

print(formatter.string(from: 1521)) // Optional("1,521")

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print(Locale.current) // en_FR (current)



print(formatter.string(from: 1.521)) // Optional("1,521")

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print(Locale.current) // ar_EG (current)



print(formatter.string(from: 1.521)) // Optional(“١٫٥٢١")

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/// 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

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print(1521.formatted()) // "1,521"

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struct ContentView: View {

var body: some View {

// Formatted Number: 1,521

Text("Formatted Number: \(1521.formatted())")

}

}

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123

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Formatters
40
1
Numbers & Currency
Integer
੔਺
123
1234

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੔਺
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formatter.numberStyle = .none

print(formatter.string(from: 1234.5678)) // Optional("1235")

formatter.roundingMode = .down

print(formatter.string(from: 1234.5678)) // Optional("1234")

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1,000
Formatters
40
2
Decimal
Numbers & Currency
ਐ਺
123

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ਐ਺
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ਐ਺
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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")




formatter.maximumSignificantDigits = 5

print(formatter.string(from: 1234.5678)) // Optional("1,234.6")

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50%
Formatters
40
3
Percent
ύʔηϯτʢඦ෼཰ʣ Numbers & Currency
123

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ύʔηϯτʢඦ෼཰ʣ
1FSDFOU
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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%

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1.62E2
Formatters
40
4
Scientific
Պֶʢࢦ਺ʣදه Numbers & Currency
123

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Պֶʢࢦ਺ʣදه
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formatter.numberStyle = .scientific

print(formatter.string(from: 162)) // Optional("1.62E2")

formatter.exponentSymbol = "e"

print(formatter.string(from: 31.4)) // Optional("3.14e1")

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two thousand
 
twenty-one
Formatters
40
5
Spell Out
௲Γ Numbers & Currency
123

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௲Γ
4QFMM0VU
41

formatter.numberStyle = .spellOut


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")

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1st
Formatters
40
6
Ordinal
ং਺ Numbers & Currency
123

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ং਺
0SEJOBM
43

formatter.numberStyle = .ordinal


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")


print(formatter.string(from: 1)) // Optional("ୈ1")




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¥1,538
Formatters
40
7
Currency
௨՟ Numbers & Currency

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௨՟
$VSSFODZ
45

formatter.numberStyle = .currency


print(formatter.string(from: 100)) // Optional("¥100")


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")


print(120.formatted(.currency(code: "JPY"))) // ¥120

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Formatters
40
8
Currency Plural
௨՟ʢ୯Ґෳ਺ܗରԠʣ Numbers & Currency
226.78
 
US dollars

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௨՟ʢ୯Ґෳ਺ܗରԠʣ
$VSSFODZ1MVSBM
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formatter.numberStyle = .currencyPlural


print(formatter.string(from: 100)) // Optional("100 ԁ")

formatter.locale = Locale(identifier: "en_JP")

print(formatter.string(from: 100)) // Optional("100 Japanese yen")


print(formatter.string(from: 100)) // Optional("100.00 US dollars")


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")

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JPY 1,538
Formatters
40
9
Currency
 
ISO Code
௨՟ίʔυ Numbers & Currency

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௨՟ίʔυ
$VSSFODZ*40$PEF
49

formatter.numberStyle = .currencyISOCode


print(formatter.string(from: 100)) // Optional("JPY 100")


print(formatter.string(from: 100)) // Optional("USD 100.00")

formatter.locale = Locale(identifier: "en_GB")

print(formatter.string(from: 100)) // Optional("GBP 100.00")


print(formatter.string(from: 100)) // Optional("HKD 100.00")

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(
¥1,538
)
Formatters
40
10
Currency
Accounting
ձܭ Numbers & Currency

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ձܭ
$VSSFODZ"DDPVOUJOH
51

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")

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Formatters
40
11
Person’s Name
Names
ਓͷ໊લ
AI
ࢁా
क
ु
จ

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ਓͷ໊લ
1FSTPO`T/BNF
53
let formatter = PersonNameComponentsFormatter()

var nameComponents = PersonNameComponents()

nameComponents.familyName = "Tanaka"

nameComponents.givenName = "Ryoga"

nameComponents.nickname = "treastrain"


print(formatter.string(from: nameComponents)) // Ryoga Tanaka


print(formatter.string(from: nameComponents)) // Tanaka Ryoga

formatter.style = .abbreviated

print(formatter.string(from: nameComponents)) // TR


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

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ਓͷ໊લ
1FSTPO`T/BNF
54

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


print(nameComponents.formatted()) // ᖂᖒᒇҰ

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ਓͷ໊લ
1FSTPO`T/BNF
55

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

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2021/09/19
11
:
30
:
00
Formatters
40
12
Dates
Dates & Times
೔࣌

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೔࣌
%BUFT
57
let date = Date(timeIntervalSince1970: 1632018600)

let formatter = DateFormatter()

formatter.dateStyle = .medium

formatter.timeStyle = .short


print(formatter.string(from: date)) // 2021/09/19 11:30


print(formatter.string(from: date)) // Sep 19, 2021 at 11:30 AM


print(formatter.string(from: date)) // 2021೥9݄19೔ ্ޕ11:30


print(date.formatted(date: .complete, time: .shortened)) // 2021೥9݄19೔ ೔༵೔ 11:30

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೔࣌
%BUFT
58



formatter.calendar = Calendar(identifier: .japanese)

formatter.dateFormat = "GyMMM"

print(formatter.string(from: date)) // ྩ࿨39݄


formatter.calendar = Calendar(identifier: .gregorian)

formatter.dateFormat = "GyMMM"

print(formatter.string(from: date)) // AD2021Sep

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˞࣮ࡍͷݪҼʹ͍ͭͯ͸ෆ໌Ͱ͢ɻ
 
˞ݱࡏ͸मਖ਼͞Ε͍ͯ·͢ɻ

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೔࣌
%BUFT
60



formatter.calendar = Calendar(identifier: .japanese)

formatter.setLocalizedDateFormatFromTemplate("GyMMM")

print(formatter.string(from: date)) // ྩ࿨3೥9݄


formatter.calendar = Calendar(identifier: .gregorian)

formatter.setLocalizedDateFormatFromTemplate("GyMMM")

print(formatter.string(from: date)) // Sep 2021 AD

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2 days,
 
1 hr, 50 min
Formatters
40
13
Quantities of
Time
Dates & Times
࣌ؒ

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࣌ؒ
2VBOUJUJFTPG5JNF
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")

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2 days ago
Formatters
40
14
Relative
 
Date or Time
Dates & Times
૬ରతͳ೔࣌

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૬ରతͳ೔࣌
3FMBUJWF%BUFPS5JNF
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

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૬ରతͳ೔࣌
3FMBUJWF%BUFPS5JNF
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

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Fri, Sep 17,
 
2021 17
:
00
 
–
 
Sun, Sep 19,
 
2021 18
:
50
Formatters
40
15
Time Intervals
Dates & Times
ִ࣌ؒؒ

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ִ࣌ؒؒ
5JNF*OUFSWBMT
67
let startDate = Date(timeIntervalSince1970: 1631865600)

let endDate = Date(timeIntervalSince1970: 1632045000)

let formatter = DateIntervalFormatter()


print(formatter.string(from: startDate, to: endDate)) // 9/17/21, 5:00 PM – 9/19/21, 6:50 PM


print(formatter.string(from: startDate, to: endDate)) // 17/9/2021 Լޕ5:00ࢸ19/9/2021 Լޕ6:50


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೔(೔)

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2021
-
09
-
19
 
T11
:
30
:
00
+
09
:
00
Formatters
40
16
ISO 8601 Format
Dates & Times
*40ܗࣜͷ೔࣌

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*40ܗࣜͷ೔࣌
*40'PSNBU
69

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


print(date.formatted(.iso8601)) // 2021-09-19T02:30:00Z

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31.25 GB
Formatters
40
17
Data Sizes
Data Sizes
σʔλαΠζ

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σʔλαΠζ
%BUB4J[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


print(byteCount.formatted(.byteCount(style: .file))) // 29.51 GB

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631.9 km
Formatters
40
18
Length
Physical Dimension
௕͞

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௕͞
-FOHUI
73
let formatter = MeasurementFormatter()


var length = Measurement(value: 900, unit: .meters)

print(formatter.string(from: length)) // 0.9 km

length = length + Measurement(value: 631, unit: .kilometers)

print(formatter.string(from: length)) // 631.9 km


print(formatter.string(from: length)) // 392.644 mi

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15.11 km²
Formatters
40
19
Area
Physical Dimension
໘ੵ

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໘ੵ
"SFB
75


var area = Measurement(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

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l௕͞zΛ࢖ͬͯ໘ੵ͸ٻΊΒΕΔ͔ʁ
/P
76
let length1 = Measurement(value: 10, unit: .meters)

let length2 = Measurement(value: 20, unit: .meters)

let length3 = length1 + length2 // 30 m

// Binary operator '*' cannot be applied to two 'Measurement' operands

// let length4 = length1 * length2

let length5 = 5 * length1 // 50 m

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525 ml
Formatters
40
20
Volume
Physical Dimension
ମੵ

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ମੵ
7PMVNF
78


let volume1 = Measurement(value: 525, unit: .milliliters)

print(formatter.string(from: volume1)) // 0.525 L


var volume2 = Measurement(value: 1, unit: .gallons)

print(formatter.string(from: volume2)) // 1 gal

volume2.convert(to: .imperialGallons)

print(formatter.string(from: volume2)) // 0.833 gal Imp.

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1.047 rad
Formatters
40
21
Angle
Physical Dimension
֯౓

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֯౓
"OHMF
80


var angle = Measurement(value: 60, unit: .degrees)

print(formatter.string(from: angle)) // 60౓

angle.convert(to: .radians)

print(formatter.string(from: angle)) // 1.047 rad

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0.187 kg
Formatters
40
22
Mass
Mass, Weight & Force
࣭ྔ

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1,013.25 hPa
Formatters
40
23
Pressure
Mass, Weight & Force
ѹྗ

View Slide

࣭ྔɾѹྗ
.BTT1SFTTVSF
83


let mass = Measurement(value: 187, unit: .grams)

print(formatter.string(from: mass)) // 0.187 kg

let pressure = Measurement(value: 1013.25, unit: .hectopascals)

print(formatter.string(from: pressure)) // 1,013.25 hPa

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9.81 m/s²
Formatters
40
24
Acceleration
Time & Motion
Ճ଎౓

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Ճ଎౓
"DDFMFSBUJPO
85


var acceleration = Measurement(value: 1, unit: .gravity) // 1 G

print(formatter.string(from: acceleration))

acceleration.convert(to: .metersPerSecondSquared)

print(formatter.string(from: acceleration)) // 9.81 m/s²

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3.967 hr
Formatters
40
25
Duration
Time & Motion
ܧଓ࣌ؒ

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50 Hz
Formatters
40
26
Frequency
Time & Motion
प೾਺

View Slide

ܧଓ࣌ؒɾप೾਺
%VSBUJPO'SFRVFODZ
88


var duration = Measurement(value: 1, unit: .hours)

duration = duration + Measurement(value: 30, unit: .minutes)

print(formatter.string(from: duration)) // 5,400ඵ

duration.convert(to: .hours)


print(formatter.string(from: duration)) // 1.5࣌ؒ

let frequency = Measurement(value: 50, unit: .hertz)

print(formatter.string(from: frequency)) // 50 Hz

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320 km/h
Formatters
40
27
Speed
Time & Motion
଎͞

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଎͞
4QFFE
90


let speed = Measurement(value: 320, unit: .kilometersPerHour)

print(formatter.string(from: speed)) // 320 km/h


print(formatter.string(from: speed)) // 198.839 mph

View Slide

9.8 J
Formatters
40
28
Energy
Energy, Heat, & Light
ΤωϧΪʔ

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61 W
Formatters
40
29
Power
ిྗ

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ΤωϧΪʔɾిྗ
&OFSHZ1PXFS
93


var energy = Measurement(value: 418400, unit: .joules)

print(formatter.string(from: energy)) // 100 kcal

energy.convert(to: .kilowattHours)


print(formatter.string(from: energy)) // 0.116 kWh

var power = Measurement(value: 61, unit: .watts)

print(formatter.string(from: power)) // 61 W

power.convert(to: .horsepower)

print(formatter.string(from: power)) // 0.082അྗ

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273.15 K
Formatters
40
30
Temperature
Թ౓

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500 lx
Formatters
40
Illuminance
31
র౓

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Թ౓ɾর౓
5FNQFSBUVSF*MMVNJOBODF
96


var temperature = Measurement(value: 273.15, unit: .kelvin)

print(formatter.string(from: temperature)) // 0°C

temperature.convert(to: .fahrenheit)


print(formatter.string(from: temperature)) // 32°F

let illuminance = Measurement(value: 500, unit: .lux)

print(formatter.string(from: illuminance)) // 500 lx

View Slide

2,815 mAh
Formatters
40
32
Electric Charge
Electricity
ిՙ

View Slide

500 mA
Formatters
40
33
Electric Current
Electricity
ిྲྀ

View Slide

141.421 V
Formatters
40
34
Electric
 
Potential Difference
Electricity
ిҐࠩʢిѹʣ

View Slide

2.4 kΩ
Formatters
40
35
Electric Resistance
Electricity
ిؾ఍߅

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ిՙɾిྲྀɾిҐࠩʢిѹʣɾిؾ఍߅
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ff
FSFODF3FTJTUBODF
101


let q = Measurement(value: 2815, unit: .milliampereHours)

print(formatter.string(from: q)) // 2,815 mAh

let i = Measurement(value: 0.5, unit: .milliamperes)

print(formatter.string(from: i)) // 500 mA

let e = Measurement(value: 141.421, unit: .volts)

print(formatter.string(from: e)) // 141.421 V

let r = Measurement(value: 2.4, unit: .kiloohms)

print(formatter.string(from: r)) // 2,400 Ω

View Slide

0.154 g/L
Formatters
40
36
Concentration of
Mass
Concentration &
Dispersion
࣭ྔೱ౓

View Slide

410.5 ppm
Formatters
40
37
Dispersion
Concentration &
Dispersion
෼ࢄ

View Slide

࣭ྔೱ౓ɾ෼ࢄ
$PODFOUSBUJPOPG.BTT%JTQFSTJPO
104


let concentrationOfMass = Measurement(value: 0.154,
unit: .gramsPerLiter)

print(formatter.string(from: concentrationOfMass)) // 0.154 g/L

let dispersion = Measurement(value: 410.5, unit: .partsPerMillion)

print(formatter.string(from: dispersion)) // 410.5 ppm

View Slide

3.115 L/100km
Formatters
40
38
Fuel Efficiency
Fuel Efficiency
೩අ

View Slide

೩අ
'VFM&
ff i
DJFODZ
106


let fuelEfficiency = Measurement(value: 3.115,
unit: .litersPer100Kilometers)

print(formatter.string(from: fuelEfficiency)) // 3.115 L/100km

View Slide

29.104 GiB
Formatters
40
39
Amount of
Information
Data Storage
৘ใྔ

View Slide

৘ใྔ
"NPVOUPG*OGPSNBUJPO
108


var amount = Measurement(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

View Slide

iPhone,
 
iPad,
 
and iPod touch
Formatters
40
40
Lists
Lists
Ϧετ

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Ϧετ
-JTUT
110
let formatter = ListFormatter()

var items = ["ΓΜ͝", "όφφ", "ΦϨϯδ"]


print(formatter.string(from: items)) // Optional("ΓΜ͝ɺόφφɺΦϨϯδ")

items = ["Apple", "Banana", "Orange"]


print(formatter.string(from: items)) // Optional("Apple, Banana, and Orange")

View Slide

Ϧετ
-JTUT
111

var items = ["೔ຊޠ", "ӳޠ", "εϖΠϯޠ"]


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")

View Slide

Ϧετ
-JTUT
112
// ஋ஈҰཡ

let items = [120, 250, 370, 490, 610, 730, 860, 980, 1100]

let itemFormatter = NumberFormatter()

itemFormatter.numberStyle = .currency


formatter.itemFormatter = itemFormatter

print(formatter.string(from: items))

// Optional("¥120ɺ¥250ɺ¥370ɺ¥490ɺ¥610ɺ¥730ɺ¥860ɺ¥980ɺ¥1,100")

View Slide

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w ޻਺Λ୹ॖͰ͖Δɾߟྀ࿙ΕΛ๷͛Δ
w ϩʔΧϥΠζڧྗͳαϙʔτ
w GPSNBUUFE
ɺ'PSNBU4UZMFͰ୹͘ॻ͘͜ͱ͕Ͱ͖Δ
w ඪ४Ͱ༻ҙ͞Ε͍ͯΔ'PSNBUUFSͷ͢΂ͯͷ࢖༻ྫ
w 'PSNBUUFSͷଘࡏ͚ͩͰ΋஌ͬͯ΄͍͠
113

View Slide

ࢀߟจݙ
3FGFSFODFT"DLOPXMFEHFNFOUT
w 'PSNBUUFSTσʔλΛώϡʔϚϯϑϨϯυϦʔʹɹ"QQMF88%$
 
IUUQTEFWFMPQFSBQQMFDPNWJEFPTQMBZXXED
w ͋ͳͨͷ஌Βͳ͍࿈བྷઌͷੈքCZ!DP
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τ͸ࣗ෼Ͱ࣮૷͠ͳ͍ͰCZ!USFBTUSBJOɹ2JJUBJ04"EWFOU$BMFOEBS
 
IUUQTRJJUBDPNUSFBTUSBJOJUFNTFFDFGGBBE
w 4USFBNMJOFZPVSMPDBMJ[FETUSJOHTɹ"QQMF88%$
 
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114

View Slide

J1IPOFͷྐྵ๏Λʮ࿨ྐྵʯʹ͢Δͱ࠶ݱͰ͖·͢

View Slide

͋Γ͕ͱ͏͍͟͝·ͨ͠ʂɹɹɹɹɹɹɹɹɹIUUQTUSFUKQɹ⏩
͋ΒΏΔ৘ใΛ
 
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ʙྩ࿨೥͔Β୤٫ͤΑʙ
116
iOSDC Japan 2021
 
Day 2
#iosdc #d

View Slide

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

treastrain / Tanaka Ryoga

More Decks by treastrain / Tanaka Ryoga

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Transcript

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

treastrain / Tanaka Ryoga

More Decks by treastrain / Tanaka Ryoga

Other Decks in Programming

Featured

Transcript

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