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Measurement And Unitを試した話
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Atsushi Uchida (utwang)
July 31, 2016
Programming
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Measurement And Unitを試した話
集まれSwift好き!Swift愛好会 vol9での発表資料です。
Atsushi Uchida (utwang)
July 31, 2016
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Transcript
Measurement And Unit Λࢼͨ͠ 2016/7/31 ू·ΕSwift͖ʂSwiftѪձ vol9
ࣗݾհ ాರ೭ (@utwang) • ϑϦʔϥϯεΤϯδχΞ כϲ࡚ࡏॅ • Swift, Rails, Javascript
• εϊʔϘʔυ͖ • ݸਓͰυϥΠϒͷׂΓצΞϓϦͩ͠·ͨ͠
׆ಈ ԣपลͰษڧձ/ΠϕϯτΛͬͯ·͢ • Railsͷ͘͘ձ/Swiftͷ͘͘ձ
• 8/21() Ϋϩʔϥʔͷӡ༻ʹ·ͭΘΔLTΠϕϯτ εϐʔΧʔɺઈࢍืूதͰ͢
ΞδΣϯμ • Ϟνϕʔγϣϯ • Measurementͱ • Կ͕Ͱ͖Δ͔ʁ • Measurement/Unitͷ͍ํ •
MeasurementΛߏ͢ΔΫϥε • ͬͯΈͯͷײ
Xcode8 beta3Ͱࢼͨ͠༰Ͱ͢ɻ ਖ਼ࣜϦϦʔε൛Ͱ༰͕ҟͳΔՄೳੑ͕͋Γ·͢ɻ
Ϟνϕʔγϣϯ • ݸਓͰ࡞ͬͨΞϓϦͷӳޠରԠ • ݴޠಉ͡Ͱ୯Ґ͕ҟͳΔ߹͕͋ Δ͕ɺશ෦ϩʔΧϥΠζରԠ͢Δͷ େม • ΞϝϦΧ: ӳޠ
/mile /gallon(US) /$ • ΠΪϦε: ӳޠ /mile /gallon(UK) /£ • Χφμɹ: ӳޠ /km /liter /CA$ • WWDC2016Ͱൃද͞Ε ͨ"Measurement And Unit"ΛௐΔ
Measurementͱ • iOS10͔Βར༻Ͱ͖ΔFoundationͷίϯϙʔωϯτ • Swift2.3ͰNSMeasurement • Swift3.0ͰMeasurement • ܭྔͷ֓೦Λදݱͨ͠ΫϥεͰྔͱ୯ҐΛऔΓѻ͏
Կ͕Ͱ͖Δ͔ʁ • ͋Δܭྔͷ୯ҐΛผͷ୯ҐมͰ͖Δ • 15 km <-> 9.32 mile •
30 kg <-> 13.6 lb (ϙϯυ) • localeʹ߹Θͤͯదͳ୯ҐΛϑΥʔϚοτ • ΧελϜͷ୯ҐɺܭྔΛ࡞
Measurementͷ͍ํ(1) ྔͱ୯ҐΛ1ͭͷΠϯελϯεͱͯ͠ཧɾίϯόʔτ • ج४ͱͳΔ୯Ґ(baseUnit)Λݩʹม • ͞ͷ߹meter͕baseUnitͱͳΔ let distanceInJapan = Measurement(value:
80, unit: UnitLength.kilometers) // => 80.0 km let distanceInUS = distanceInJapan.converted(to: UnitLength.miles) // => 49.7098189319845 mi
Measurementͷ͍ํ(2) ΧελϜͷ୯ҐΛ࡞Ͱ͖Δ • ೩අͷϓϦηοτ L/100km, mile/gal(US), mile/gal(UK) • ຊͰkm/LͰද͢ͷ͕Ұൠతɻج४ͷL/100km͔ΒͷൺΛ ࢦఆͯ͠৽ͨʹ୯ҐΛ࡞Δɻ
let kmPerLiter = UnitFuelEfficiency(symbol: "km/l", converter: UnitConverterLinear(coefficient: 0.25)) //UnitFuelEfficiencyͷextensionͱͯ͠ఆٛՄೳ let fuelEfficiencyInJp = Measurement(value: 10, unit: kmPerLiter) // => 10 km/L
Measurementͷ͍ํ(3) localeʹ߹Θͤͨ୯ҐΛมߋ • LocaleใΛͭMeasurementFormatter͕༻ҙ͞Ε͍ͯΔ • Regionʹదͨ͠୯ҐΛදࣔ͢Δ let mFormatter = MeasurementFormatter()
mFormatter.unitStyle = .short let distance = Measurement(value: 400, unit: UnitLength.kilometers) mFormatter.string(from: distance) // => 248.549 mi (in US) // => 400 km (in Canada)
MeasurementΛߏ͢ ΔΫϥε • Measurement(ܭྔ) • Unit(୯Ґ) • Dimension(ཧྔͷ࣍ݩ) • நΫϥε
• UnitXXX (UnitAngle, UnitLength, UnitVolume ...) • Dimensionͷ۩Ϋϥε • UnitConverter
MeasurementΛߏ͢ ΔΫϥε ৽͍͠ཧྔͷ࣍ݩΛ࡞Δ߹ • DimensionΛܧঝͨ͠UnitTypingSpeed Λ࡞ • ֤୯Ґͱͯ͠UnitTypingSpeedܕΛࣗ Λฦ͢ϓϩύςΟΛ༻ҙ͢Δ class
UnitTypingSpeed: Dimension { static let punchPerSecond = UnitTypingSpeed(symbol: "punch/s") static let charsPerMinute = UnitTypingSpeed(symbol: "chars/min", converter: UnitPunchToCharConverter())
ͬͯΈͯͷײ ͍ॴ • ͋Δ୯ҐͷܭྔΛผͷ୯ҐͰද͍ࣔͨ͠߹ • ҬͰ୯ҐΛΓସ͍͑ͨ߹ Θͳ͍͍ͯ͘(͑ͳ͍)ॴ • ୯ҐΛ୯ͳΔϥϕϧͱͯ͠ද͍ࣔͨ͠߹ •
֎෦ཁૉͰൺ͕มΘΔͳͲɺ୯७ͳมͰͳ͍߹ (୯ՁͳͲҝସมಈͷӨڹΛड͚Δ(20 $/lb => 2500 ¥/kg))
͍ॴ
͓·͚ ୯Ґͷॻ͖ํࠃࡍతʹܾΊΒΕ͓ͯΓɺͷޙʹ֯̍Ϛε ۭ͚ɺ୯ҐΛॻ͘ɻྫ͑ɺ1.50 kgͱॻ͘ɻ — ग़యݩ: Wikipedia