そろそろ FormatStyle

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 2 treastrain / Tanaka Ryoga @treastrainɹhttps://tret.jp Swift 🦅 / Core NFC 📶 - Japan NFC Reader 💳 - PadDisplay 📺 - XCIntelligenceBridge 🌉 DeNA Co., Ltd. - iOS App Developer ( April 2021 - Current)

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. What’s new for Apple developers - Apple Developer https://developer.apple.com/whats-new/ iOS 15 ( 2021 ) iOS 16 ( 2022 ) iOS 17 ( 2023 ) iOS 18 ( 2024 ) iOS 26 ( 2025 ) 11

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date) } } } 20 􀒊 Initializer 'init(_:)' requires that 'Date' conform to 'StringProtocol'

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Objective-C ͷ࣌୅͔Βଘࡏ͢Δ NSFormatter 40 NSDateFormatterɹNSDateIntervalFormatterɹ NSISO8601DateFormatterɹNSRelativeDateTimeFormatterɹ NSDateComponentsFormatterɹNSNumberFormatterɹ NSByteCountFormatterDateFormatterɹ NSPersonNameComponentsFormatterɹ NSMeasurementFormatterɹNSEnergyFormatterɹ NSLengthFormatterɹNSMassFormatterɹNSListFormatter

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Swift ͔Β Objective-C ͷࢿ࢈Λ࢖͏ SE - 0086 Drop NS Prefix in Swift Foundation 41 DateFormatterɹDateIntervalFormatterɹ ISO8601DateFormatterɹRelativeDateTimeFormatterɹ DateComponentsFormatterɹNumberFormatterɹ ByteCountFormatterDateFormatterɹ PersonNameComponentsFormatterɹ MeasurementFormatterɹEnergyFormatterɹ LengthFormatterɹMassFormatterɹListFormatter

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 44 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateStyle = .long formatter.timeStyle = .short

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 45 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateStyle = .long formatter.timeStyle = .short let formattedDate: String = formatter.string(from: date) // 2024೥12݄31೔ 23:59

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 46 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateStyle = .long formatter.timeStyle = .none let formattedDate: String = formatter.string(from: date) // 2024೥12݄31೔

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 47 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateFormat = "Y೥M݄"

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 48 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateFormat = "Y೥M݄" let formattedDate: String = formatter.string(from: date) // 2025೥12݄ 😔

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 49 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateFormat = "Y೥M݄" let formattedDate: String = formatter.string(from: date) // 2025೥12݄ 😔 Unicode Locale Data Markup Language (LDML)

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 51 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateFormat = "Y೥M݄" let formattedDate: String = formatter.string(from: date) // 2025೥12݄

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 52 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateFormat = "y೥M݄" let formattedDate: String = formatter.string(from: date) // 2024೥12݄

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 53 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateFormat = "y೥M݄" let formattedDate: String = formatter.string(from: date) // 2024೥12݄ December 2024...?

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 54 import Foundation let date = Date(timeIntervalSinceReferenceDate: 757349999) // 2024೥12݄31೔ 23:59:59ʢ೔ຊ࣌ؒʣ let formatter = DateFormatter() formatter.dateFormat = "y೥M݄" let formattedDate: String = formatter.string(from: date) // 2024೥12݄

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ͜Ε·Ͱͷ Formatter Swift ͔Β࢖͏ͱ͖ʹؾΛ͚ͭΔ͜ͱ • จࣈྻʹΑΔϑΥʔϚοτܗࣜͷࢦఆ͕ՄೳɺίϯύΠϧ࣌ʹݕূ͞Εͳ͍ • Formatter ͷΠϯελϯεͷੜ੒ɾϓϩύςΟͷมߋͷίετ͕ߴ͍ • Πϯελϯεੜ੒ɾϓϩύςΟมߋͷճ਺ΛݮΒͨ͢Ίʹ ΩϟογϡΛҙࣝͨ͠Γɺࣗ෼ͰͦͷͨΊͷ࣮૷Λͨ͠Γ͢Δඞཁ • ΫϥεʢࢀরܕʣͰ͋Δ • ໋ྩܕͷ API σβΠϯ 66

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 69 nentsFormatStyleɹIntegerFormatStyle.CurrencyɹStringStyleɹDecimal.FormatStyl ateOffsetɹDuration.TimeFormatStyleɹDate.AttributedStyleɹMeasurement.Attribu FormatStyleɹSystemFormatStyle.DateReferenceɹDateComponents.HTTPFormatSt utedɹListFormatStyleɹMeasurement.FormatStyle.ByteCountɹDate.IntervalForma ributedɹDecimal.FormatStyleɹDate.ISO8601FormatStyleɹIntegerFormatStyle.Per edɹURL.FormatStyleɹDate.FormatStyle.AttributedɹDate.RelativeFormatStyleɹFlo tɹDate.VerbatimFormatStyle.AttributedɹPersonNameComponents.FormatStyleɹD yɹDecimal.FormatStyle.CurrencyɹIntegerFormatStyleɹMeasurement.AttributedS atchɹDuration.UnitsFormatStyleɹPersonNameComponents.AttributedStyleɹInteg horedRelativeFormatStyleɹByteCountFormatStyleɹDateComponents.ISO8601Form

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 70 struct ContentView: View { var title: String var date: Date private var formattedDate: String { let formatter = DateFormatter() formatter.dateStyle = .long formatter.timeStyle = .short return formatter.string(from: date) } var body: some View { VStack { Text(title) Text(formattedDate) } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 72 struct ContentView: View { var title: String var date: Date private var formattedDate: String { let formatter = DateFormatter() formatter.dateStyle = .medium formatter.timeStyle = .none return formatter.string(from: date) } var body: some View { VStack { Text(title) Text(formattedDate) } } } struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date.formatted()) } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 73 struct ContentView: View { var title: String var date: Date private var formattedDate: String { let formatter = DateFormatter() formatter.dateStyle = .medium formatter.timeStyle = .none return formatter.string(from: date) } var body: some View { VStack { Text(title) Text(formattedDate) } } } struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date.formatted()) } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 74 struct ContentView: View { var title: String var date: Date private var formattedDate: String { let formatter = DateFormatter() formatter.dateStyle = .medium formatter.timeStyle = .none return formatter.string(from: date) } var body: some View { VStack { Text(title) Text(formattedDate) } } } struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date.formatted()) } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 75 struct ContentView: View { var title: String var date: Date private var formattedDate: String { let formatter = DateFormatter() formatter.dateStyle = .medium formatter.timeStyle = .none return formatter.string(from: date) } var body: some View { VStack { Text(title) Text(formattedDate) } } } struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date.formatted( Date.FormatStyle( date: .abbreviated, time: .omitted ) )) } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 76 let formatter = DateFormatter() formatter.dateFormat = "y೥M݄" formatter.string(from: date) // 2024೥12݄ date.formatted( .dateTime .year().month() ) // 2024೥12݄

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 79 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol FormatStyle< FormatInput, FormatOutput > : Decodable, Encodable, Hashable { associatedtype FormatInput associatedtype FormatOutput func format(_ value: Self.FormatInput) -> Self.FormatOutput func locale(_ locale: Locale) -> Self }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 80 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol FormatStyle< FormatInput, FormatOutput > : Decodable, Encodable, Hashable { associatedtype FormatInput associatedtype FormatOutput func format(_ value: Self.FormatInput) -> Self.FormatOutput func locale(_ locale: Locale) -> Self }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 81 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol FormatStyle< FormatInput, FormatOutput > : Decodable, Encodable, Hashable { associatedtype FormatInput associatedtype FormatOutput func format(_ value: Self.FormatInput) -> Self.FormatOutput func locale(_ locale: Locale) -> Self }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 82 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol FormatStyle< FormatInput, FormatOutput > : Decodable, Encodable, Hashable { associatedtype FormatInput associatedtype FormatOutput func format(_ value: Self.FormatInput) -> Self.FormatOutput func locale(_ locale: Locale) -> Self }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 84 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol FormatStyle< FormatInput, FormatOutput > : Decodable, Encodable, Hashable { associatedtype FormatInput associatedtype FormatOutput func format(_ value: Self.FormatInput) -> Self.FormatOutput func locale(_ locale: Locale) -> Self } Date String

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ͢΂ͯͷ FormatStyle iOS 26 ·Ͱʹ౥ࡌ͞Ε͍ͯΔ΋ͷ͢΂ͯ • SwiftɺFoundationɺStoreKit ʹ͋Δ 29 छྨ͢΂ͯ • ͢΂ͯΛҰ౓ʹ֮͑Δʹ͸਺͕ଟ͍ • ެ։ࢿྉ΍ΞʔΧΠϒͰͷৼΓฦΓͷ͖͔͚ͬʹͳΕ͹ • ೖྗଆͷܕɺग़ྗଆͷܕΛ͜ͷΑ͏ʹࣔ͠·͢ 86 String Date

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.FormatStyle 88 String Date let date = Date.now // 2025/9/20 13:00 date.formatted() // 2025೥9݄20೔ ౔༵೔ 13:00:00 date.formatted(date: .complete, time: .standard)

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.FormatStyle 89 String Date let date = Date.now // 2025೥9݄20೔ date.formatted(.dateTime.month().day().year()) // 2025/09/20 date.formatted(.dateTime.year().month(.twoDigits).day(.twoDigits))

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.ISO8601FormatStyle 90 String Date let date = Date.now // 2025-09-20T04:00:00Z date.formatted(.iso8601) // 20250920T04:00:00Z date.formatted(.iso8601.dateSeparator(.omitted))

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.ISO8601FormatStyle 91 String Date let date = Date.now // 2025-09-20T13:00:00+0900 date.formatted(Date.ISO8601FormatStyle( timeZone: TimeZone(identifier: "Asia/Tokyo")! )) // 2025-09-20T04:00:00.000Z date.formatted(.iso8601.year().month().day() .time(includingFractionalSeconds: true) .timeZone(separator: .colon))

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. DateComponents.ISO8601FormatStyle 92 String DateComponents let components: DateComponents = ... // 2025-09-20T04:00:00Z components.formatted(.iso8601) // 20250920T04:00:00Z components.formatted(.iso8601.dateSeparator(.omitted)) // 2025-09-20T04:00:00.000Z components.formatted(.iso8601.year().month().day() .time(includingFractionalSeconds: true) .timeZone(separator: .colon))

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. DateComponents.HTTPFormatStyle 94 String DateComponents let components: DateComponents = ... // Sat, 20 Sep 2025 04:00:00 GMT components.formatted(.http)

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.VerbatimFormatStyle 95 String Date let date = Date.now // JIS X 0301 Ͱ͸ // ʮ೥߸ʢ1จࣈʣͱ೥ͷ਺ࣈ2ܻʯʮ݄ͷ਺ࣈ2ܻʯʮ೔ͷ਺ࣈ2ܻʯΛϐϦΦυͰܨ͙ let jisX0301Format: Date.FormatString = "\(era: .narrow)\(year: .twoDigits) .\(month: .twoDigits) .\(day: .twoDigits)"

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.VerbatimFormatStyle 96 String Date let date = Date.now let jisX0301Format: Date.FormatString = ... // R07.09.20 date.formatted(.verbatim( jisX0301Format, locale: Locale(languageCode: .japanese, languageRegion: .japan), timeZone: TimeZone(identifier: "Asia/Tokyo")!, calendar: Calendar(identifier: .japanese) ))

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.IntervalFormatStyle 97 String Range let startDate = ... // 2025೥9݄19೔ 16:00 let endDate = ... // 2025೥9݄21೔ 18:00 let iosdcJapan2025: Range = startDate..

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.RelativeFormatStyle 99 String Date let lastMonth: Date = ... lastMonth.formatted(.relative(presentation: .named)) // དྷ݄ let nextMonth: Date = ... nextMonth.formatted(.relative(presentation: .named)) // དྷ݄ nextMonth.formatted(.relative(presentation: .numeric)) // 1 ͔݄ޙ let twoDaysAgo: Date = ... twoDaysAgo.formatted(.relative(presentation: .named)) // Ұࡢ೔ // ΞϝϦΧӳޠ؀ڥͰ͸ 2 days ago

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Date.AnchoredRelativeFormatStyle 100 String Date let lastMonth: Date = ... let nextMonth: Date = ... // 2 ͔݄લ nextMonth.formatted( Date.AnchoredRelativeFormatStyle(anchor: lastMonth) )

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. IntegerFormatStyle FloatingPointFormatStyle Decimal.FormatStyle 102 String BinaryInteger BinaryFloatingPoint Decimal let integer: Int = 17 let floating: Double = 6.3 let decimal: Decimal = 179800 integer.formatted() // 17 floating.formatted() // 6.3 decimal.formatted() // 179,800

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. IntegerFormatStyle FloatingPointFormatStyle Decimal.FormatStyle 103 String BinaryInteger BinaryFloatingPoint Decimal let integer: Int = 17 let floating: Double = 6.3 let decimal: Decimal = 179800 integer.formatted(.number.rounded(increment: 10)) // 20 floating.formatted(.number.scale(10)) // 63 decimal.formatted(.number.notation(.compactName)) // 18ສ // ΞϝϦΧӳޠ؀ڥͰ͸ 180K

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. IntegerFormatStyle.Percent FloatingPointFormatStyle.Percent Decimal.FormatStyle.Percent 104 String BinaryInteger BinaryFloatingPoint Decimal let number = 0.75 number.formatted(.percent) // ೔ຊͷ೔ຊޠ؀ڥͰ͸ 75% // ΤδϓτͷΞϥϏΞޠ؀ڥͰ͸ ٪٧٥ number.formatted(.percent.rounded(increment: 10)) // 80%

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. IntegerFormatStyle.Currency FloatingPointFormatStyle.Currency Decimal.FormatStyle.Currency 105 String BinaryInteger BinaryFloatingPoint Decimal let japaneseYen = 159800 let canadianDollars = 1449 japaneseYen.formatted(.currency(code: "JPY")) // ೔ຊͷ೔ຊޠ؀ڥͩͱ ¥159,800 canadianDollars.formatted(.currency(code: "CAD")) // Χφμͷӳޠ؀ڥͩͱ $1,449.00 ϑϥϯεޠ؀ڥͩͱ 1 449,00 $

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Duration.TimeFormatStyle 107 String Duration let duration = Duration.seconds(40 * 60) duration.formatted() // 0:40:00 duration.formatted(.time(pattern: .minuteSecond)) // 40:00

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Duration.TimeFormatStyle 108 String Duration let duration = Duration.milliseconds(500) duration.formatted() // 0:00:00 duration.formatted(.time(pattern: .hourMinuteSecond(padHourToLength: 0, fractionalSecondsLength: 2) )) // 0:00:00.50

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Duration.UnitsFormatStyle 109 String Duration let duration = Duration.seconds(40 * 60) duration.formatted(.units()) // 40෼ duration.formatted(.units( allowed: [.minutes, .seconds], zeroValueUnits: .show(length: 2) )) // 40෼ 00ඵ

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Measurement ܭଌ஋ • ໘ੵɹUnitArea • ௕͞ɹUnitLength • ମੵɹUnitVolume • ֯౓ɹUnitAngle • ॏ͞ɹUnitMass • ѹྗɹUnitPressure • Ճ଎౓ɹUnitAcceleration • ܧଓ࣌ؒɹUnitDuration • प೾਺ɹUnitFrequency • ଎͞ɹUnitSpeed • ΤωϧΪʔɹUnitEnergy • ిྗɹUnitPower • Թ౓ɹUnitTemperature • র౓ɹUnitIlluminance • ిՙɹUnitElectricCharge • ిྲྀɹUnitElectricCurrent • ిѹɹUnitElectricPotentialDifference • ిؾ఍߅ɹUnitElectricResistance • ࣭ྔೱ౓ɹUnitConcentrationMass • ෼ࢄɹUnitDispersion • ೩අɹUnitFuelEfficiency • ৘ใྔɹUnitInformationStorage 111

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Measurement ܭଌ஋ 113 let aomori = Measurement(value: 9646, unit: UnitArea.squareKilometers) let akita = Measurement(value: 11638, unit: UnitArea.squareKilometers) let iwate = Measurement(value: 15275, unit: UnitArea.squareKilometers)

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Measurement.FormatStyle 114 String Measurement let aomori = Measurement(value: 9646, unit: UnitArea.squareKilometers) let akita = Measurement(value: 11638, unit: UnitArea.squareKilometers) let iwate = Measurement(value: 15275, unit: UnitArea.squareKilometers) aomori.formatted() // 9,646 km² akita.formatted(.measurement(width: .wide)) // 11,638ฏํΩϩϝʔτϧ iwate.formatted(.measurement(width: .abbreviated) .locale(Locale( languageCode: .english, languageRegion: .unitedStates)) ) // 5,898 sq mi

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ByteCountFormatStyle Measurement.FormatStyle.ByteCount 115 String Int64 Measurement let xcode26 = 8552433052 // 8.55 GB xcode26.formatted(.byteCount(style: .file)) // 8,552.4 MB xcode26.formatted(.byteCount(style: .file, allowedUnits: .mb))

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. PersonNameComponents.FormatStyle 117 String PersonNameComponents var compontents = PersonNameComponents() compontents.familyName = "ͨͳ͔" compontents.givenName = "Γΐ͏͕" compontents.nickname = "treastrain"

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. PersonNameComponents.FormatStyle 118 String PersonNameComponents compontents.formatted() // ͨͳ͔Γΐ͏͕ compontents.formatted(.name(style: .medium) .locale(Locale(languageRegion: .unitedStates)) ) // ͨͳ͔Γΐ͏͕ compontents.formatted(.name(style: .short)) // treastrain compontents.formatted(.name(style: .abbreviated)) // treastrain

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. PersonNameComponents.FormatStyle 119 String PersonNameComponents var compontents = PersonNameComponents() compontents.familyName = "Tanaka" compontents.givenName = "Ryoga" compontents.nickname = "treastrain"

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. PersonNameComponents.FormatStyle 120 String PersonNameComponents compontents.formatted() // Tanaka Ryoga compontents.formatted(.name(style: .medium) .locale(Locale(languageRegion: .unitedStates)) ) // Ryoga Tanaka compontents.formatted(.name(style: .short)) // treastrain compontents.formatted(.name(style: .abbreviated)) // TR compontents.formatted(.name(style: .abbreviated) .locale(Locale(languageRegion: .unitedStates)) ) // RT

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. URL.FormatStyle 122 String URL let url = URL(string: "https://www.example.com:8080/path/to/endpoint?key=value")! url.formatted() // https://www.example.com/path/to/endpoint let url = URL(string: "https://example.com/endpoint?key1=value1&key2=value2")! url.formatted( .url.scheme(.never).host(.never).path(.never).query(.always) ) // ?key1=value1&key2=value2

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. URL.FormatStyle 123 String URL let url = URL(string: "https://www.example.com:8080/path/to/endpoint")! url.formatted(.url.scheme(.never).path(.never)) // www.example.com let abunaiURL = URL(string: "https://example.comΜexampleΜ.example.com/path/to/endpoint")! url.formatted(.url.scheme(.never).path(.never)) // example.comΜexampleΜ.example.com

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ListFormatStyle 125 String Sequence let ϑϧʔπ = ["ΓΜ͝", "όφφ", "Έ͔Μ"] ϑϧʔπ.formatted() // ΓΜ͝ɺόφφɺΈ͔Μ ϑϧʔπ.formatted(.list(type: .or)) // ΓΜ͝ɺόφφɺ·ͨ͸Έ͔Μ // ΞϝϦΧӳޠ؀ڥͰ͸ let fruits = ["Apple", "Banana", "Orange"] fruits.formatted() // Apple, Banana, and Orange fruits.formatted( .list(type: .and, width: .short)) // Apple, Banana, & Orange

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ListFormatStyle 126 String Sequence let numbers = [1, 10, 100, 1000] numbers.formatted(.list(memberStyle: .number, type: .and)) // 1ɺ10ɺ100ɺ1,000

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. StringStyle 127 String String let numbers = [1, 10, 100, 1000] numbers.formatted(.list(memberStyle: .number, type: .and)) // 1ɺ10ɺ100ɺ1,000 let ϑϧʔπ = ["ΓΜ͝", "όφφ", "Έ͔Μ"] ϑϧʔπ.formatted(.list(type: .or)) // ΓΜ͝ɺόφφɺ·ͨ͸Έ͔Μ ListFormatStyle ListFormatStyle

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Product.SubscriptionPeriod.Unit.FormatStyle 128 Product.SubscriptionPeriod.Unit String import StoreKit let identifiers = [ "com.example.app.item1", // 1िؒͷࣗಈߋ৽αϒεΫϦϓγϣϯ "com.example.app.item2", // 1ϲ݄ͷࣗಈߋ৽αϒεΫϦϓγϣϯ "com.example.app.item3", // 1೥ͷࣗಈߋ৽αϒεΫϦϓγϣϯ ] for product in try await Product.products(for: identifiers) { let subscription = product.subscription! subscription.subscriptionPeriod.unit .formatted(product.subscriptionPeriodUnitFormatStyle) // ि // ݄ // ೥ }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ͢΂ͯͷ FormatStyle iOS 26 ·Ͱʹ౥ࡌ͞Ε͍ͯΔ΋ͷ͢΂ͯ • SwiftɺFoundationɺStoreKit ʹ͋Δ 29 छྨ͢΂ͯ • ͢΂ͯΛҰ౓ʹ֮͑Δʹ͸਺͕ଟ͍ • ެ։ࢿྉ΍ΞʔΧΠϒͰৼΓฦΓʹདྷ͍ͯͩ͘͞ • ೖྗଆͷܕɺग़ྗଆͷܕΛ͜ͷΑ͏ʹࣔ͠·ͨ͠ 129 String Date

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 131 Date.FormatStyleɹDate.ISO8601FormatStyle Date.VerbatimFormatStyleɹDate.IntervalFormatStyle IntegerFormatStyleɹDate.ComponentsFormatStyle FloatingPointFormatStyleɹDate.RelativeFormatStyle Decimal.FormatStyleɹDate.AnchoredRelativeFormatStyle Duration.TimeFormatStyleɹDate.HTTPFormatStyle Duration.UnitsFormatStyleɹDateComponents.HTTPFormatStyle Measurement.FormatStyleɹDateComponents.ISO8601FormatStyle ByteCountFormatStyleɹIntegerFormatStyle.Percent Measurement.FormatStyle.ByteCountɹFloatingPointFormatStyle.Percent PersonNameComponents.FormatStyleɹDecimal.FormatStyle.Percent IntegerFormatStyle.CurrencyɹFloatingPointFormatStyle.Currencyɹ Decimal.FormatStyle.CurrencyɹURL.FormatStyle

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 132 Date.FormatStyle.Attributed Date.VerbatimFormatStyle.Attributed IntegerFormatStyle.Attributed FloatingPointFormatStyle.Attributed Decimal.FormatStyle.Attributed Duration.TimeFormatStyle.Attributed Duration.UnitsFormatStyle.Attributed Measurement.AttributedStyle ByteCountFormatStyle.Attributed Measurement.AttributedStyle.ByteCount PersonNameComponents.AttributedStyle

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. Attribute ʹରԠͨ͠ FormatStyle iOS 26 ·Ͱʹ౥ࡌ͞Ε͍ͯΔ΋ͷ͢΂ͯ • Date.FormatStyle • Date.VerbatimFormatStyle • IntegerFormatStyle • FloatingPointFormatStyle • Decimal.FormatStyle • Duration.TimeFormatStyle • Duration.UnitsFormatStyle • Measurement.FormatStyle • ByteCountFormatStyle • Measurement.FormatStyle.ByteCount • PersonNameComponents.FormatStyle 133 AttributedString ...

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 134 struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date.formatted( Date.FormatStyle( date: .long, time: .shortened ) )) } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 135 var formattedDate: String { date.formatted( Date.FormatStyle( date: .long, time: .shortened ) ) } var body: some View { VStack { Text(title) Text(formattedDate) } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 137 var formattedDate: AttributedString { var string = date.formatted( Date.FormatStyle( date: .long, time: .shortened ) .attributedStyle ) let year = AttributeContainer() .dateField(.year) let color = AttributeContainer() .foregroundColor(.red) string.replaceAttributes(year, with: color) return string }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 138 struct ContentView: View { var price: Decimal var formattedPrice: AttributedString { var string = price.formatted( .currency(code: "JPY").attributed ) let currencySymbol = AttributeContainer() .numberSymbol(.currency) let font = AttributeContainer().font(.title) string.replaceAttributes(currencySymbol, with: font) return string } var body: some View { Text(formattedPrice).font(.largeTitle) } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. SwiftUI ʹ͋Δ Attributed ͳ FormatStyle iOS 18 ͔Βͷετοϓ΢Υον΍λΠϚʔͳͲͷදࣔʹಛԽ • SystemFormatStyle.DateOffset • SystemFormatStyle.DateReference • SystemFormatStyle.Stopwatch • SystemFormatStyle.Timer 139

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date) } } } 141 􀒊 Initializer 'init(_:)' requires that 'Date' conform to 'StringProtocol'

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. struct ContentView: View { var title: String var date: Date var body: some View { VStack { Text(title) Text(date, format: .dateTime) } } } 143 􀊫 DiscreteFormatStyle

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 145 struct ContentView: View { @State private var number = 0 var body: some View { TextField( "Input the magic number", value: $number, format: .number ) .keyboardType(.numberPad) } } String ...

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 147 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol ParseableFormatStyle : FormatStyle { associatedtype Strategy : ParseStrategy where Self.FormatInput == Self.Strategy.ParseOutput, Self.FormatOutput == Self.Strategy.ParseInput var parseStrategy: Self.Strategy { get } } @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol ParseStrategy : Decodable, Encodable, Hashable { associatedtype ParseInput associatedtype ParseOutput func parse(_ value: Self.ParseInput) throws -> Self.ParseOutput }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 148 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol ParseableFormatStyle : FormatStyle { associatedtype Strategy : ParseStrategy where Self.FormatInput == Self.Strategy.ParseOutput, Self.FormatOutput == Self.Strategy.ParseInput var parseStrategy: Self.Strategy { get } } @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol ParseStrategy : Decodable, Encodable, Hashable { associatedtype ParseInput associatedtype ParseOutput func parse(_ value: Self.ParseInput) throws -> Self.ParseOutput }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 149 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol ParseableFormatStyle : FormatStyle { associatedtype Strategy : ParseStrategy where Self.FormatInput == Self.Strategy.ParseOutput, Self.FormatOutput == Self.Strategy.ParseInput var parseStrategy: Self.Strategy { get } } @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) public protocol ParseStrategy : Decodable, Encodable, Hashable { associatedtype ParseInput associatedtype ParseOutput func parse(_ value: Self.ParseInput) throws -> Self.ParseOutput }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ParseableFormatStyle iOS 26 ·Ͱʹ౥ࡌ͞Ε͍ͯΔ΋ͷ͢΂ͯ • Date.FormatStyle • Date.ISO8601FormatStyle • Date.VerbatimFormatStyle • Date.HTTPFormatStyle • DateComponents.HTTPFormatStyle • DateComponents.ISO8601FormatStyle • IntegerFormatStyle • IntegerFormatStyle.Percent • IntegerFormatStyle.Currency • FloatingPointFormatStyle • FloatingPointFormatStyle.Percent • FloatingPointFormatStyle.Currency • Decimal.FormatStyle • Decimal.FormatStyle.Percent • Decimal.FormatStyle.Currency • PersonNameComponents.FormatStyle • URL.FormatStyle 150

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. struct ContentView: View { @State private var port: NWEndpoint.Port = 8080 var body: some View { TextField( "Port", value: $port, format: ... ) } } 154 String NWEndpoint.Port

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 156 extension NWEndpoint.Port { struct FormatStyle: Foundation.FormatStyle { func format(_ value: NWEndpoint.Port) -> String { value.rawValue.formatted(.number.grouping(.never)) } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 157 extension FormatStyle where Self == NWEndpoint.Port.FormatStyle { static var port: Self { .init() } } extension NWEndpoint.Port { func formatted() -> FormatStyle.FormatOutput { FormatStyle.port.format(self) } } NWEndpoint.Port(8080).formatted()

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 159 extension NWEndpoint.Port { struct FormatStyle: ParseableFormatStyle { let parseStrategy: ParseStrategy func format(_ value: NWEndpoint.Port) -> String { ... } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 160 extension NWEndpoint.Port { struct FormatStyle: ParseableFormatStyle { ... } struct ParseStrategy: Foundation.ParseStrategy { func parse(_ value: String) throws -> NWEndpoint.Port { if let port = NWEndpoint.Port(value) { return port } else { throw CocoaError(.formatting, ...) } } } }

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. 161 extension ParseableFormatStyle where Self == NWEndpoint.Port.FormatStyle { static var port: Self { .init(parseStrategy: .port) } } extension ParseStrategy where Self == NWEndpoint.Port.ParseStrategy { static var port: Self { .init() } } extension NWEndpoint.Port { func formatted() -> FormatStyle.FormatOutput { FormatStyle.port.format(self) } } NWEndpoint.Port(8080).formatted()

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ͦΖͦΖ FormatStyle • ʮσʔλͷϑΥʔϚοτʯ͸ීஈͷ։ൃͷதʹᷓΕ͍ͯΔ • ͸͡Ί͔Β༻ҙ͞Ε͍ͯΔ FormatStyle ͸๛෋ʹ͋Γɺ Swift Β͍҆͠શ͞΍ SwiftUI ͷΑ͏ͳΠϯλʔϑΣΠεΛඋ͍͑ͯΔ • ಠࣗͷ FormatStyle Λ࡞֦ͬͯுͰ͖Δॊೈ͕͋͞Δ 162

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Copyright © 2025 treastrain / Tanaka RyogaɹAll rights reserved. ؔ࿈ • ຊτʔΫͷλΠτϧ͸ iOSDC Japan 2020 ͷ shiz ͞ΜͷτʔΫʮͦΖͦΖ CombineʯͷΦϚʔδϡͰ͢ • Foundationͷ৽ػೳ - WWDC21 - ϏσΦ - Apple Developer https://developer.apple.com/jp/videos/play/wwdc2021/10109/ • Get it right (to left)ʢӈ͔Βࠨํ޲΁ͷจࣈମʣ - WWDC22 - ϏσΦ - Apple Developer https://developer.apple.com/jp/videos/play/wwdc2022/10107/ • ΞϓϦͷଟݴޠମݧͷ޲্ - WWDC25 - ϏσΦ - Apple Developer https://developer.apple.com/jp/videos/play/wwdc2025/222/ • InstrumentsʹΑΔSwiftUIͷύϑΥʔϚϯε࠷దԽ - WWDC25 - ϏσΦ - Apple Developer https://developer.apple.com/jp/videos/play/wwdc2025/306/ 163