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String Interpolation
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USAMI Kosuke
November 28, 2016
Programming
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760
String Interpolation
https://kanmoba.connpass.com/event/45133/
USAMI Kosuke
November 28, 2016
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Transcript
Swift String Interpolation USAMI Kosuke Fenrir Inc.
String Interpolation let price = 2 let number = 3
let message = "One cookie: $\(price), \(number) cookies:" + "$\(price * number)."
จࣈྻิؒखܰͰศརͰ͢Ͷ » ͚ͩͲɺϩδοΫ෦ͰΘͳ͍ํ͕͍͍ » URL ͱ͔ΫΤϦͱ͔Ͱආ͚Δ » ݁Ռ͕༧ଌͮ͠Β͍ͨΊ » ͋͘·Ͱɺ͓खܰදࣔ༻ͷػೳͰ͋Δ
จࣈྻิ͕ؒͲͷΑ͏ʹߦΘΕΔ͔ » ExpressibleByStringInterpolation ϓϩτίϧʹઆ໌͕͋Δ » ·ͣɺϦςϥϧ෦ͱิؒ෦ʹׂ͞ΕΔ » ͦΕͧΕͷิؒ෦͕ init(stringInterpolationSegment:) ʹ
͞ΕΔ » ͦΕΒͷ݁Ռ͕ init(stringInterpolation:) ʹ͞ΕΔ
͜Μͳײ͡ let message = String(stringInterpolation: String(stringInterpolationSegment: "One cookie: $"), String(stringInterpolationSegment:
price), String(stringInterpolationSegment: ", "), String(stringInterpolationSegment: number), String(stringInterpolationSegment: " cookies: $"), String(stringInterpolationSegment: price * number), String(stringInterpolationSegment: "."))
ExpressibleByStringInterpolation » ͭ·Γɺ͜ͷϓϩτίϧΛࣗલͰ࣮͢ΕΧελϚΠζͰ͖Δ » ͔࣮͠͠ɺ͜ΕΛ࣮͢Δඞཁ͋·Γͳ͍ʢޙड़ʣ
จࣈྻิؒͷσϑΥϧτͷৼΔ͍ » String.init(describing:) Λฦ͢Α͏࣮͞Ε͍ͯΔ » ͨͩ͠ɺ͍͔ͭ͘ͷϏϧτΠϯܕผ࣮ʢBool ͳͲʣ » ref :
https://github.com/apple/swift/blob/swift-3.0.1- RELEASE/stdlib/public/core/StringInterpolation.swift.gyb
String.init(describing:) » TextOutputStreamable ʹద߹͍ͯͨ͠Β .write(to: s) Λฦ͢ » CustomStringConvertible ʹద߹͍ͯͨ͠Β
.description Λฦ͢ » CustomDebugStringConvertible ʹద߹͍ͯͨ͠ Β .debugDescription Λฦ͢ » ͦΕҎ֎ Swift ඪ४ϥΠϒϥϦ͕ࣗಈੜ͢Δ
ࣗલclassΛจࣈྻิؒʹରԠ͢Δʹ » ExpressibleByStringInterpolation ͡Όͳ͍͍ͯ͘ » ྫ͑ CustomStringConvertible ͷ .description Λ࣮
» ͩ͜ΘΒͳ͍ͳΒɺඪ४·͔ͤͰग़ྗ͞ΕΔ
ͱ͜ΖͰ Swift 4 Ͱɾɾɾ » ExpressibleByStringInterpolation deprecated » SwiftDoc.org
» Deprecated: it will be replaced or redesigned in Swift 4.0. Instead of conforming to 'ExpressibleByStringInterpolation', consider adding an 'init(_:String)'.
Ͳ͏ͳΔͷʁ » Proposal SE-0137 : Avoiding Lock-In to Legacy Protocol
Designs » We know this protocol to be mis-designed and limited, but there's no time to fix it for Swift 3. » ࠶ઃܭ͞ΕΔ༧ఆΒ͍͠ » Ϧςϥϧ෦ͱิؒ෦ʹׂɺͱ͔ buggy ͳײ͡
ࢀߟ » SwiftDoc.org » github.com/apple/swift » Swift ͷ Bool ͷจࣈྻදݱͷݴޠ༷
- ja.stackoverflow.com