Measurement And Unit Λࢼͨ͠࿩ 2016/7/31 ू·ΕSwift޷͖ʂSwiftѪ޷ձ vol9

ࣗݾ঺հ ಺ాರ೭ (@utwang) • ϑϦʔϥϯεΤϯδχΞ כϲ࡚ࡏॅ • Swift, Rails, Javascript • εϊʔϘʔυ޷͖ • ݸਓͰυϥΠϒ୅ͷׂΓצΞϓϦͩ͠·ͨ͠

׆ಈ ԣ඿पลͰษڧձ/ΠϕϯτΛ΍ͬͯ·͢ • Railsͷ΋͘΋͘ձ/Swiftͷ΋͘΋͘ձ

• 8/21(೔) Ϋϩʔϥʔͷӡ༻ʹ·ͭΘΔLTΠϕϯτ εϐʔΧʔɺઈࢍืूதͰ͢

ΞδΣϯμ • Ϟνϕʔγϣϯ • Measurementͱ͸ • Կ͕Ͱ͖Δ͔ʁ • Measurement/Unitͷ࢖͍ํ • MeasurementΛߏ੒͢ΔΫϥε • ࢖ͬͯΈͯͷײ૝

Xcode8 beta3Ͱࢼͨ͠಺༰Ͱ͢ɻ ਖ਼ࣜϦϦʔε൛Ͱ͸಺༰͕ҟͳΔՄೳੑ͕͋Γ·͢ɻ

Ϟνϕʔγϣϯ • ݸਓͰ࡞ͬͨΞϓϦͷӳޠରԠ • ݴޠ͸ಉ͡Ͱ΋୯Ґ͕ҟͳΔ৔߹͕͋ Δ͕ɺશ෦ϩʔΧϥΠζରԠ͢Δͷ͸ େม • ΞϝϦΧ: ӳޠ /mile /gallon(US) /$ • ΠΪϦε: ӳޠ /mile /gallon(UK) /£ • Χφμɹ: ӳޠ /km /liter /CA$ • WWDC2016Ͱൃද͞Ε ͨ"Measurement And Unit"Λௐ΂Δ

Measurementͱ͸ • iOS10͔Βར༻Ͱ͖ΔFoundationͷίϯϙʔωϯτ • Swift2.3Ͱ͸NSMeasurement • Swift3.0Ͱ͸Measurement • ܭྔͷ֓೦Λදݱͨ͠ΫϥεͰྔͱ୯ҐΛऔΓѻ͏

Կ͕Ͱ͖Δ͔ʁ • ͋Δܭྔͷ୯ҐΛผͷ୯Ґ΁ม׵Ͱ͖Δ • 15 km <-> 9.32 mile • 30 kg <-> 13.6 lb (ϙϯυ) • localeʹ߹Θͤͯద੾ͳ୯ҐΛϑΥʔϚοτ • ΧελϜͷ୯ҐɺܭྔΛ࡞੒

Measurementͷ࢖͍ํ(1) ྔͱ୯ҐΛ1ͭͷΠϯελϯεͱͯ͠؅ཧɾίϯόʔτ • 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

Measurementͷ࢖͍ํ(2) ΧελϜͷ୯ҐΛ࡞੒Ͱ͖Δ • ೩අͷϓϦηοτ͸ L/100km, mile/gal(US), mile/gal(UK) • ೔ຊͰ͸km/LͰද͢ͷ͕Ұൠతɻج४ͷL/100km͔Βͷൺ཰Λ ࢦఆͯ͠৽ͨʹ୯ҐΛ࡞Δɻ let kmPerLiter = UnitFuelEfficiency(symbol: "km/l", converter: UnitConverterLinear(coefficient: 0.25)) //UnitFuelEfficiencyͷextensionͱͯ͠΋ఆٛՄೳ let fuelEfficiencyInJp = Measurement(value: 10, unit: kmPerLiter) // => 10 km/L

Measurementͷ࢖͍ํ(3) localeʹ߹Θͤͨ୯ҐΛมߋ • Locale৘ใΛ΋ͭMeasurementFormatter͕༻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)

MeasurementΛߏ੒͢ ΔΫϥε • Measurement(ܭྔ) • Unit(୯Ґ) • Dimension(෺ཧྔͷ࣍ݩ) • ந৅Ϋϥε • UnitXXX (UnitAngle, UnitLength, UnitVolume ...) • Dimensionͷ۩৅Ϋϥε • UnitConverter

MeasurementΛߏ੒͢ 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৔߹ • ஍ҬͰ୯ҐΛ੾Γସ͍͑ͨ৔߹ ࢖Θͳͯ͘΋͍͍(࢖͑ͳ͍)ॴ • ୯ҐΛ୯ͳΔϥϕϧͱͯ͠ද͍ࣔͨ͠৔߹ • ֎෦ཁૉͰൺ཰͕มΘΔͳͲɺ୯७ͳม׵Ͱ͸ͳ͍৔߹ (୯ՁͳͲ͸ҝସมಈͷӨڹΛड͚Δ(20 $/lb => 2500 ¥/kg))

࢖͍ॴ

͓·͚ ୯Ґͷॻ͖ํ͸ࠃࡍతʹܾΊΒΕ͓ͯΓɺ਺஋ͷޙʹ൒֯̍Ϛε ۭ͚ɺ୯ҐΛॻ͘ɻྫ͑͹ɺ1.50 kgͱॻ͘ɻ — ग़యݩ: Wikipedia