iOS アプリ開発におけるデータストリーム超入門

J04ΞϓϦ։ൃʹ͓͚Δ σʔλετϦʔϜ௒ೖ໳ ߐຊޫ੖ :6.&.*HSPX.PCJMF 1

ࣗݾ঺հ w ͑΋ͱΈͭ͸Δ w גࣜձࣾΏΊΈJ04ςοΫϦʔυ w ࠷ۙ͸ʮετάϥʯͷήʔϜ഑৴ΛݟΔ͜ͱ͕ଟ͍ w Զɺ͜ͷൃද͕ऴΘͬͨΒʮ%2ϞϯελʔζʯΛങ͏Μͩ 2

એ఻ w ٕज़ॻయٕॻതίϛέʹͯɺٕ ज़ಉਓࢽʮΏΊΈେٕྛ` ʯΛແྉ഑෍ w ίϛέͰࢴຊΛ༻ҙ͍ͯ͠·͢ʂ w ࢲ͸ʰ3FEVY4BHBGPS4XJGUʱΛॻ͖·ͨ͠
w ٕज़ॻయΦϯϥΠϯϚʔέοτPS#005)Ͱ ిࢠ൛ΛऔಘՄೳͰ͢ 3

σʔλετϦʔϜ w ೚ҙͳλΠϛϯά΍ස౓Ͱൃੜ͢Δ࿈ଓతͳσʔλ w σʔλͷൃੜස౓͸೚ҙͰɺٸ૿ͨ͠Γɾ͠ͳ͔ͬͨΓͱϚνϚν w ٕज़ॻయͰࣥචͨ͠಺༰Ͱ΋σʔλετϦʔϜΛར༻͠·ͨ͠ TUBSU 4 IUUQTJCJTGPSFTUPSHJOEFYQIQ
σʔλετϦʔϜ

σʔλετϦʔϜͷ࣮૷ w σʔλͷൃߦʢ1VCMJTIFSʣɺߪಡʢ4VCTDSJCFSʣΛ੍ޚ͢Δ w ͓ͦΒ͘࠷΋؆୯ͳͷ͸/PUJ fi DBUJPO$FOUFSΛར༻͢Δ w QPTU @
BEE0CTFSWFS GPS/BNFPCKFDURVFVFVTJOH w ࠓճ͸$PNCJOFΛར༻͠·ͨ͠ w /PUJ fi DBUJPO$FOUFSͱ૊Έ߹ΘͤΔํ๏΋͋Γ·͕͢ɺࠓճ͸୯ମར༻ 5

$PNCJOFΛ࢖ͬͨ஋ൃߦ w ஋ൃߦͷํ๏͸͍͔ͭ͋͘Γ·͢ w จࣈྻΛൃߦ͢ΔγϯϓϧͳσʔλൃߦͷྫͰ͢ import Combine let subject =
PassthroughSubject<String, Error>() func put(_ value: String) { subject.send(value) } 6

$PNCJOFΛ࢖ͬͨ஋ड৴ w ൃߦ͞Εͨ஋ΛTJOL Ͱड͚औΔ w ஋ΛίʔϧόοΫʢΫϩʔδϟʣͰ͸ͳͯ͘BXBJUͰड͚औΓ͍ͨͳʜ var subscriptions = [AnyCancellable]()
func receive(completion: (String) -> Void) -> Future <String, Never> { guard let self else { return } self.subject.sink { [weak self] in // ׬ྃ΍Τϥʔॲཧ } receiveValue: { completion($0) }.store(in: &self.subscriptions) } 7

$PNCJOFΛ࢖ͬͨ஋ड৴ʢվʣ w J04Ҏ্ͷ৔߹ɺ'VUVSFͰ 4XJGU$PODVSSFODZʹม׵Ͱ͖Δ w J04ະຬ͸ɺίʔϧόοΫΛ XJUI$IFDLFE$POUJOVBUBJPOͳ ͲͰม׵͢Δ w 04WFSࠩ΍ม׵͕͋Δͱγϯϓϧ
͡Όͳ͍͠ɺίʔυྔ΋૿͑Δʜ var subscriptions = [AnyCancellable]() func receive() -> Future <String, Never> { return Future { [weak self] promise in guard let self else { return } self.subject.sink { [weak self] in // ׬ྃ΍Τϥʔॲཧ } receiveValue: { promise(.success($0)) }.store(in: &self.subscriptions) } } func take() async -> Void { let value = await receive().value // … } 8

4XJGU$PODVSSFODZͰ΋Ͱ͖Δ w $PODVSSFODZ͸BTZODBXBJU͚ͩ͡Όͳ͍ʂ w "TZOD4USFBN w ৽͍͠ཁૉΛੜ੒͢ΔͨΊʹܧଓΛݺͼग़͢Ϋϩʔδϟ͔Βੜ੒͞ΕΔ ඇಉظγʔέϯε w IUUQTEFWFMPQFSBQQMFDPNEPDVNFOUBUJPOTXJGUBTZODTUSFBN
9

"TZOD4USFBN w "TZOD4USFBNΛܧঝͨ͠ϓϩύ ςΟʢTUSFBNʣΛ࡞Δ w ௨ৗͷίʔυͱετϦʔϜͷΠ ϯλϑΣʔεͷDPOUJOVBUJPO ΛൃՐͤ͞Δ w ൃߦͷQVU࣌ʹZJFME
Λ࣮ߦ w தؒͷIBOEMFS΋͋ͬͯෳࡶʜ var handler: ((String) -> Void)? var stream: AsyncStream<String> { AsyncStream { [weak self] continuation in self?.handler = { value in continuation.yield(value) } } } func put(_ value: String){ handler?(value) } for await value in stream { print("streamed value is \(value)") } 10

γϯϓϧͳ"TZOD4USFBN w J04%FQMPZNFOU5BSHFUҎ্ʹ͢Δͱɺ.JOJNVN%FQMPZNFOUT ͕J04Ҏ্ͷ؀ڥʹόοΫσϓϩΠ͞ΕΔ let (stream, continuation) = AsyncStream.makeStream(of: String.self)
func put(_ value: String){ continuation.yield(value) } for await value in stream { print("streamed value is \(value)") } 11 IUUQTEFWFMPQFSBQQMFDPNEPDVNFOUBUJPOTXJGUBTZODTUSFBNNBLFTUSFBN PGCV ff FSJOHQPMJDZ

ൺֱ̍ɿൃߦͱߪಡ w $PNCJOF൛͸ɺൃߦͱߪಡΛOʹ࣮૷Ͱ͖Δ w ҰํͰɺ$PODVSSFODZ൛ͷൃߦͱߪಡ͸ʹͳΔ w ൃߦʹԠͯ͡ɺରʹͳͬͨTUFBNͷDPOUJOVBUJPOZFJME ͕ݺ͹ΕΔ w ಈ࡞࢓༷͕ҟͳΔͷͰɺ׬શஔ׵͸೉͍͠
w ৄ͍͠ਓɺڭ͑ͯ 12

ൺֱ̎ɿߪಡͷॲཧ w $PNCJOF൛͸ɺߪಡ͞Εͨ஋ΛίʔϧόοΫʢΫϩʔδϟʣ΍BTZOD BXBJUͰར༻Ͱ͖Δ w ҰํͰɺ$PODVSSFODZ൛͸"TZOD4FRVFODFΛܧঝ͢ΔͨΊɺߪಡ͞ Εͨ஋͸BXBJUJOͰͷར༻ʹͳΔ w ʮGPSBXBJU@JOTUSFBNʯͷറΓ͸ͭΒ͍ w
ৄ͍͠ਓɺڭ͑ͯ 13

·ͱΊ w σʔλετϦʔϜ͸$PNCJOF4XJGU$PODVSSFODZͰ࣮૷Ͱ͖Δ w ͨͩ͠ɺͦΕͧΕͰಛ௃͕ҟͳΓɺ׬શޓ׵ͱ͸ݴ͑ͳ͍ w ࠷ۙͷྲྀߦ͸$PODVSSFODZ΁ஔ׵͕ͩɺσʔλετϦʔϜ͸৻ॏʹ w %FQMPZ5BSHFUҎ্ʹݶΓɺ$PODVSSFODZ͸؆୯ʹॻ͚Δ w
࠷ۙͷ͸ɺ࣌ʑόοΫσϓϩΠΛͯ͘͠Εͯ༏͍͠ 14

iOS アプリ開発におけるデータストリーム超入門

iOS アプリ開発におけるデータストリーム超入門

Mitsuharu Emoto

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J04ΞϓϦ։ൃʹ͓͚Δ σʔλετϦʔϜ௒ೖ໳ ߐຊޫ੖ :6.&.*HSPX.PCJMF 1

ࣗݾ঺հ w ͑΋ͱΈͭ͸Δ w גࣜձࣾΏΊΈJ04ςοΫϦʔυ w ࠷ۙ͸ʮετάϥʯͷήʔϜ഑৴ΛݟΔ͜ͱ͕ଟ͍ w Զɺ͜ͷൃද͕ऴΘͬͨΒʮ%2ϞϯελʔζʯΛങ͏Μͩ 2

એ఻ w ٕज़ॻయٕॻതίϛέʹͯɺٕ ज़ಉਓࢽʮΏΊΈେٕྛ` ʯΛແྉ഑෍ w ίϛέͰࢴຊΛ༻ҙ͍ͯ͠·͢ʂ w ࢲ͸ʰ3FEVY4BHBGPS4XJGUʱΛॻ͖·ͨ͠

σʔλετϦʔϜ w ೚ҙͳλΠϛϯά΍ස౓Ͱൃੜ͢Δ࿈ଓతͳσʔλ w σʔλͷൃੜස౓͸೚ҙͰɺٸ૿ͨ͠Γɾ͠ͳ͔ͬͨΓͱϚνϚν w ٕज़ॻయͰࣥචͨ͠಺༰Ͱ΋σʔλετϦʔϜΛར༻͠·ͨ͠ TUBSU 4 IUUQTJCJTGPSFTUPSHJOEFYQIQ

σʔλετϦʔϜͷ࣮૷ w σʔλͷൃߦʢ1VCMJTIFSʣɺߪಡʢ4VCTDSJCFSʣΛ੍ޚ͢Δ w ͓ͦΒ͘࠷΋؆୯ͳͷ͸/PUJ fi DBUJPO$FOUFSΛར༻͢Δ w QPTU @

$PNCJOFΛ࢖ͬͨ஋ൃߦ w ஋ൃߦͷํ๏͸͍͔ͭ͋͘Γ·͢ w จࣈྻΛൃߦ͢ΔγϯϓϧͳσʔλൃߦͷྫͰ͢ import Combine let subject =

$PNCJOFΛ࢖ͬͨ஋ड৴ w ൃߦ͞Εͨ஋ΛTJOL Ͱड͚औΔ w ஋ΛίʔϧόοΫʢΫϩʔδϟʣͰ͸ͳͯ͘BXBJUͰड͚औΓ͍ͨͳʜ var subscriptions = [AnyCancellable]()

$PNCJOFΛ࢖ͬͨ஋ड৴ʢվʣ w J04Ҏ্ͷ৔߹ɺ'VUVSFͰ 4XJGU$PODVSSFODZʹม׵Ͱ͖Δ w J04ະຬ͸ɺίʔϧόοΫΛ XJUI$IFDLFE$POUJOVBUBJPOͳ ͲͰม׵͢Δ w 04WFSࠩ΍ม׵͕͋Δͱγϯϓϧ

4XJGU$PODVSSFODZͰ΋Ͱ͖Δ w $PODVSSFODZ͸BTZODBXBJU͚ͩ͡Όͳ͍ʂ w "TZOD4USFBN w ৽͍͠ཁૉΛੜ੒͢ΔͨΊʹܧଓΛݺͼग़͢Ϋϩʔδϟ͔Βੜ੒͞ΕΔ ඇಉظγʔέϯε w IUUQTEFWFMPQFSBQQMFDPNEPDVNFOUBUJPOTXJGUBTZODTUSFBN

"TZOD4USFBN w "TZOD4USFBNΛܧঝͨ͠ϓϩύ ςΟʢTUSFBNʣΛ࡞Δ w ௨ৗͷίʔυͱετϦʔϜͷΠ ϯλϑΣʔεͷDPOUJOVBUJPO ΛൃՐͤ͞Δ w ൃߦͷQVU࣌ʹZJFME

γϯϓϧͳ"TZOD4USFBN w J04%FQMPZNFOU5BSHFUҎ্ʹ͢Δͱɺ.JOJNVN%FQMPZNFOUT ͕J04Ҏ্ͷ؀ڥʹόοΫσϓϩΠ͞ΕΔ let (stream, continuation) = AsyncStream.makeStream(of: String.self)

ൺֱ̍ɿൃߦͱߪಡ w $PNCJOF൛͸ɺൃߦͱߪಡΛOʹ࣮૷Ͱ͖Δ w ҰํͰɺ$PODVSSFODZ൛ͷൃߦͱߪಡ͸ʹͳΔ w ൃߦʹԠͯ͡ɺରʹͳͬͨTUFBNͷDPOUJOVBUJPOZFJME ͕ݺ͹ΕΔ w ಈ࡞࢓༷͕ҟͳΔͷͰɺ׬શஔ׵͸೉͍͠

ൺֱ̎ɿߪಡͷॲཧ w $PNCJOF൛͸ɺߪಡ͞Εͨ஋ΛίʔϧόοΫʢΫϩʔδϟʣ΍BTZOD BXBJUͰར༻Ͱ͖Δ w ҰํͰɺ$PODVSSFODZ൛͸"TZOD4FRVFODFΛܧঝ͢ΔͨΊɺߪಡ͞ Εͨ஋͸BXBJUJOͰͷར༻ʹͳΔ w ʮGPSBXBJU@JOTUSFBNʯͷറΓ͸ͭΒ͍ w

·ͱΊ w σʔλετϦʔϜ͸$PNCJOF4XJGU$PODVSSFODZͰ࣮૷Ͱ͖Δ w ͨͩ͠ɺͦΕͧΕͰಛ௃͕ҟͳΓɺ׬શޓ׵ͱ͸ݴ͑ͳ͍ w ࠷ۙͷྲྀߦ͸$PODVSSFODZ΁ஔ׵͕ͩɺσʔλετϦʔϜ͸৻ॏʹ w %FQMPZ5BSHFUҎ্ʹݶΓɺ$PODVSSFODZ͸؆୯ʹॻ͚Δ w