レシート印刷が途中で止まる？Stream APIとBluetooth接続のルールを守って楽しくレシートプリンターで印刷しよう！ / iOSDC Japan 2025 satoryo

J04%$+BQBO Ϩγʔτҹ࡮్͕தͰࢭ·Δʁ 4USFBN"1*ͱ#MVFUPPUI઀ଓͷϧʔϧΛ कָͬͯ͘͠ϨγʔτϓϦϯλʔͰҹ࡮͠Α͏ʂ CZTBUPSZP!TBUPSZP

satoryo STORES גࣜձࣾ iOSɾAndroidΤϯδχΞ ࣗݾ঺հ X(Twitter): @satoryo056 ࠓ೥ͷ WWDC25
ʹ΋ॳࢀՃʂ iOSDC ॳొஃͰ40෼τʔΫʂ

ళฮͰ͓ձܭ͢Δͱ ΋Β͑Δ΋ͷʁ

Ϩγʔτ🧾

αʔϏε঺հɿ4503&4Ϩδ ɾখചۀɾαʔϏεۀͷళฮ޲͚ΞϓϦ ɾݱ஍Ͱͷ͓ձܭͰΦʔφʔɾελοϑ͕࢖༻

αʔϏε঺հɿ4503&4Ϩδ ɾখചۀɾαʔϏεۀͷళฮ޲͚ΞϓϦ ɾݱ஍Ͱͷ͓ձܭͰΦʔφʔɾελοϑ͕࢖༻ ɾ͓ձܭޙͷϨγʔτ΍ ྖऩॻҹ࡮ͷχʔζ͕ߴ͍

αʔϏε঺հɿ4503&4Ϩδ ɾখചۀɾαʔϏεۀͷళฮ޲͚ΞϓϦ ɾݱ஍Ͱͷ͓ձܭͰΦʔφʔɾελοϑ͕࢖༻ ɾ͓ձܭޙͷϨγʔτ΍ ྖऩॻҹ࡮ͷχʔζ͕ߴ͍ ɾϨγʔτϓϦϯλʔͱ઀ଓ͠ Ϩγʔτҹ࡮Λαϙʔτ

ຊτʔΫͰ࿩͢͜ͱ ϨγʔτϓϦϯλʔͷ঺հ ෳ਺ͷϝʔΧʔΛαϙʔτ Ϩγʔτҹ࡮్͕தͰࢭ·Δෆ۩߹ ·ͱΊ

ϨγʔτϓϦϯλʔͷ঺հ

ϨγʔτϓϦϯλʔʹ͍ͭͯ ɾϨγʔτ ྖऩॻΛൃߦ͢ΔͨΊͷઐ༻ϓϦϯλʔ ɾ#MVFUPPUI΍64#έʔϒϧ ༗ઢ-"/ͳͲͰ୺຤ͱ઀ଓ ɾϢʔεέʔεʹ߹Θͤͯෳ਺ͷछྨ͕ଘࡏ Ҿ༻ɿIUUQTSFHJGBRTUPSFTKQIDKBBSUJDMFT

ϞόΠϧΞϓϦͰϨγʔτҹ࡮Λ͢Δʹ͸ʁ

ϞόΠϧΞϓϦͰϨγʔτҹ࡮Λ͢Δʹ͸ʁ ֤ϝʔΧʔͷ4%,Λར༻

4%,Λར༻ͨ͠Ϩγʔτҹ࡮ͷ࣮૷ྫ // 1. ϓϦϯλʔݕࡧ let manager = StarDeviceDiscoveryManager() let
printers = try await manager.discoverPrinters() // 2. ϓϦϯλʔ઀ଓ guard let printer = printers.first else { return } let starPrinter = StarPrinter(connectionSettings: printer.connectionSettings) ελʔਫ਼ີ4UBS9QBOE4%,ͷ৔߹ // 3. Ϩγʔτ࡞੒ let builder = StarXpandCommand.DocumentBuilder() builder.addPrinter( StarXpandCommand.PrinterBuilder() .styleAlignment(.center) .styleBold(true) .actionPrintText("Ϩγʔτ\n") .styleBold(false) .styleAlignment(.left) .actionPrintText("঎඼໊: ίʔώʔ\n") .actionPrintText("ֹۚ: ¥300\n") .actionCut(.partial) ) // 4. ҹ࡮࣮ߦ let commands = builder.getCommands() try await starPrinter.print(command: commands) Ҿ༻ɿIUUQTHJUIVCDPNTUBSNJDSPOJDT4UBS9QBOE4%,J04

4%,Λར༻ͨ͠Ϩγʔτҹ࡮ͷ࣮૷ྫ // 1. ϓϦϯλʔݕࡧ let manager = StarDeviceDiscoveryManager() let
printers = try await manager.discoverPrinters() // 2. ϓϦϯλʔ઀ଓ guard let printer = printers.first else { return } let starPrinter = StarPrinter(connectionSettings: printer.connectionSettings) ελʔਫ਼ີ4UBS9QBOE4%,ͷ৔߹ // 3. Ϩγʔτ࡞੒ let builder = StarXpandCommand.DocumentBuilder() builder.addPrinter( StarXpandCommand.PrinterBuilder() .styleAlignment(.center) .styleBold(true) .actionPrintText("Ϩγʔτ\n") .styleBold(false) .styleAlignment(.left) .actionPrintText("঎඼໊: ίʔώʔ\n") .actionPrintText("ֹۚ: ¥300\n") .actionCut(.partial) ) // 4. ҹ࡮࣮ߦ let commands = builder.getCommands() try await starPrinter.print(command: commands) ࢀߟɿIUUQTHJUIVCDPNTUBSNJDSPOJDT4UBS9QBOE4%,J04 গͳ͍ߦ਺Ͱ Ϩγʔτҹ࡮͕Մೳʂ

ෳ਺ͷϝʔΧʔΛαϙʔτ ϨγʔτϓϦϯλʔͰҹ࡮͢Δ

ͳͥෳ਺ͷϝʔΧʔΛαϙʔτʁ ɾ4503&4ϨδΛར༻͢Δళฮ͝ͱʹϢʔεέʔε͕ҟͳΔ ɾݻఆͰஔ͖͍ͨPS࣋ͪӡͼ͍ͨ ɾݱۚΛҰॹʹ؅ཧ͍ͨ͠ ɾಛఆͷϨγʔτ෯ʹ͍ͨ͠ɹͳͲ ɾ͞·͟·ͳϢʔεέʔεʹԠ͑ΔͨΊ ෳ਺ͷϝʔΧʔΛαϙʔτ

4503&4Ϩδ͕αϙʔτ͢ΔϨγʔτϓϦϯλʔͷҰ෦ &QTPO ελʔਫ਼ີ ͦͷଞ ਾ͑ஔ͖ܕ ਾ͑ஔ͖ܕ υϩϫʔҰମܕ ख࣋ͪܕ ηΠίʔΠϯεπϧ
ख࣋ͪܕ ख࣋ͪܕ λϒϨοτҰମܕ Ҿ༻ɿIUUQTSFHJGBRTUPSFTKQIDKBBSUJDMFT

ϝʔΧʔͷαϙʔτΛ૿΍͢ʹ͸ʁ

ϝʔΧʔͷαϙʔτΛ૿΍͢ʹ͸ʁ શͯͷϝʔΧʔͷ4%,Λ ΞϓϦʹ૊ΈࠐΉ

શͯͷϝʔΧʔͷ4%,Λ૊ΈࠐΉ͜ͱ ϝϦοτ ɾ֤ϝʔΧʔ੡ͷϓϦϯλʔΛશͯαϙʔτͰ͖Δ σϝϦοτ ɾ4%,͝ͱʹ"1*࢓༷͕ҟͳΔ ɾڞ௨ΠϯλʔϑΣʔεԽͷ೉қ౓͕ߴ͍ ɾͦ΋ͦ΋4%,͕ͳ͍ϝʔΧʔ͕ଘࡏ͢Δ

શͯͷϝʔΧʔͷ4%,Λ૊ΈࠐΉ͜ͱ ϝϦοτ ɾ֤ϝʔΧʔ੡ͷϓϦϯλʔΛશͯαϙʔτͰ͖Δ σϝϦοτ ɾ4%,͝ͱʹ"1*࢓༷͕ҟͳΔ ɾڞ௨ΠϯλʔϑΣʔεԽͷ೉қ౓͕ߴ͍ ɾͦ΋ͦ΋4%,͕ଘࡏ͠ͳ͍ϝʔΧʔ͕ଘࡏ͢Δ 4%,͚ͩͰ͸ શͯͷϝʔΧʔʹ
ରԠͰ͖ͳ͍

શͯͷϝʔΧʔͷ4%,Λ૊ΈࠐΉ͜ͱ ϝϦοτ ɾ֤ϝʔΧʔ੡ͷϓϦϯλʔΛશͯαϙʔτͰ͖Δ σϝϦοτ ɾ4%,͝ͱʹ"1*࢓༷͕ҟͳΔ ɾڞ௨ΠϯλʔϑΣʔεԽͷ೉қ౓͕ߴ͍ ɾͦ΋ͦ΋4%,͕ଘࡏ͠ͳ͍ϝʔΧʔ͕ଘࡏ͢Δ ࣗ෼ͨͪͰ ࡞Δ͔͠ͳ͍🦌

શͯͷϝʔΧʔͷ4%,Λ૊ΈࠐΉ͜ͱ ϝϦοτ ɾ֤ϝʔΧʔ੡ͷϓϦϯλʔΛશͯαϙʔτͰ͖Δ σϝϦοτ ɾ4%,͝ͱʹ"1*࢓༷͕ҟͳΔ ɾڞ௨ΠϯλʔϑΣʔεԽͷ೉қ౓͕ߴ͍ ɾͦ΋ͦ΋4%,͕ଘࡏ͠ͳ͍ϝʔΧʔ͕ଘࡏ͢Δ 4%,Λ࢖Θͣʹ ෳ਺ϝʔΧʔΛαϙʔτ

4%,Λ࢖ΘͣϨγʔτϓϦϯλʔͰҹ࡮͢ΔྲྀΕ ϨγʔτϓϦϯλʔΛ୳͢ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ ϨγʔτϓϦϯλʔʹσʔλΛૹΔ

ϨγʔτϓϦϯλʔΛ୳͢ ɾ4503&4ϨδͰ͸#MVFUPPUI$MBTTJDΛར༻ ɾ&""DDFTTPSZ.BOBHFSΛ࢖༻͠ϨγʔτϓϦϯλʔͱ઀ଓ

طଘͷ઀ଓࡁΈΞΫηαϦΛεΩϟϯ͢Δ৔߹ // ௨஌ొ࿥ EAAccessoryManager.shared().registerForLocalNotifications() let accessories = EAAccessoryManager.shared().connectedAccessories for
accessory in accessories { // accessory: EAAccessory ͔ΒϨγʔτϓϦϯλʔΛݕࡧ } ϨγʔτϓϦϯλʔΛ୳͢

accessory in accessories { // accessory: EAAccessory ͔ΒϨγʔτϓϦϯλʔΛݕࡧ } ϨγʔτϓϦϯλʔΛ୳͢ ઀ଓࡁΈΞΫηαϦΛऔಘ

accessory in accessories { // accessory: EAAccessory ͔ΒϨγʔτϓϦϯλʔΛݕࡧ } ϨγʔτϓϦϯλʔΛ୳͢ ઀ଓࡁΈΞΫηαϦ͔Βݕࡧ

ϨγʔτϓϦϯλʔΛ୳͢ ৽نΞΫηαϦΛεΩϟϯ͢Δ৔߹ /// BluetoothΞΫηαϦϐοΧʔΛදࣔ public func showBluetoothAccessoryPicker( nameFilter:
NSPredicate? = nil ) async throws { try await EAAccessoryManager .shared() .showBluetoothAccessoryPicker( withNameFilter: nameFilter ) }

NSPredicate? = nil ) async throws { try await EAAccessoryManager .shared() .showBluetoothAccessoryPicker( withNameFilter: nameFilter ) } ΞΫηαϦ໊ͰߜΓࠐΈՄೳ

NSPredicate? = nil ) async throws { try await EAAccessoryManager .shared() .showBluetoothAccessoryPicker( withNameFilter: nameFilter ) }

઀ଓ௨஌ͷ؂ࢹ let connectToken = NotificationCenter.default.addObserver( forName: .EAAccessoryDidConnect, object: nil,
queue: .main ) { [weak self] notification in // ઀ଓͨ͠ϨγʔτϓϦϯλʔΛอ࣋ let accessory = notification.object as? EAAccessory … } notificationTokens.append(connectToken) ϨγʔτϓϦϯλʔΛ୳͢

queue: .main ) { [weak self] notification in // ઀ଓͨ͠ϨγʔτϓϦϯλʔΛอ࣋ let accessory = notification.object as? EAAccessory … } notificationTokens.append(connectToken) ϨγʔτϓϦϯλʔΛ୳͢ ΞΫηαϦͱ઀ଓͨ࣌͠ʹ௨஌

queue: .main ) { [weak self] notification in // ઀ଓͨ͠ϨγʔτϓϦϯλʔΛอ࣋ let accessory = notification.object as? EAAccessory … } notificationTokens.append(connectToken) ϨγʔτϓϦϯλʔΛ୳͢

੾அ௨஌ͷ؂ࢹ let disconnectToken = NotificationCenter.default.addObserver( forName: .EAAccessoryDidDisconnect, object: nil,
queue: .main ) { [weak self] notification in // ੾அͨ͠ϨγʔτϓϦϯλʔΛ࡟আ } notificationTokens.append(disconnectToken) ϨγʔτϓϦϯλʔΛ୳͢

੾அ௨஌ͷ؂ࢹ let disconnectToken = NotificationCenter.default.addObserver( forName: .EAAccessoryDidDisconnect, object: nil,
queue: .main ) { [weak self] notification in // ੾அͨ͠ϨγʔτϓϦϯλʔΛ࡟আ } notificationTokens.append(disconnectToken) ϨγʔτϓϦϯλʔΛ୳͢ ΞΫηαϦͱ੾அͨ࣌͠ʹ௨஌

Ϩγʔτσʔλͷੜ੒4503&4Ϩδͷ৔߹ ɾϨγʔτσʔλͷߏ੒ ɾϔομʔ৘ใɿλΠτϧ΍ը૾ͳͲ ɾ঎඼৘ใɿ঎඼໊΍Ձ֨ͳͲ ɾձܭ৘ใɿ߹ܭֹۚ΍੫ۚͳͲ ɾϑολʔ৘ใɿ23ίʔυͳͲ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ

ϓϦϯλʔίϚϯυϓϩτίϧ ɾϝʔΧʔ͝ͱʹϨγʔτϓϦϯλʔ༻ͷίϚϯυମܥ͕ଘࡏ ɾ&QTPO͕։ൃͨ͠ʮ&4$104ܗࣜʯ ɾελʔਫ਼ີ͕։ൃͨ͠ʮ4UBS 13/5ܗࣜʯ ɾίϚϯυ͸ਐ਺ͰදݱʢྫɿY"ʣ ɾςΩετ΍ը૾ͷҹ࡮ͳͲ༷ʑͳίϚϯυΛઃఆՄೳ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ

// վߦίϚϯυ public func lineFeedCommand() -> Data { Data([0x0A])
} // ςΩετҹ࡮ίϚϯυ public func textCommand(_ text: String) -> Data { text.data(using: .utf8) ?? Data() } // ςΩετΛଠࣈʹ͢ΔίϚϯυ public func boldCommand(_ enabled: Bool) -> Data { let value: UInt8 = enabled ? 0x01 : 0x00 return Data([0x1B, 0x45, value]) } ϝʔΧʔڞ௨ίϚϯυͷྫ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ

// վߦίϚϯυ public func lineFeedCommand() -> Data { Data([0x0A])
} // ςΩετҹ࡮ίϚϯυ public func textCommand(_ text: String) -> Data { text.data(using: .utf8) ?? Data() } // ςΩετΛଠࣈʹ͢ΔίϚϯυ public func boldCommand(_ enabled: Bool) -> Data { let value: UInt8 = enabled ? 0x01 : 0x00 return Data([0x1B, 0x45, value]) } ϝʔΧʔڞ௨ίϚϯυͷྫ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ %BUBܕΛฦ͢

// ϨγʔτΛΧοτʢ੾அʣ͢ΔίϚϯυ public func cutPaperCommand() -> Data { Data([0x1D,
0x56, 0x00]) } // ը૾Λҹ࡮͢ΔͨΊͷίϚϯυ public func bitmapCommand(_ data: Data, width: Int, height: Int) -> Data { var command = Data() // ϏοτϚοϓҹ࡮ίϚϯυ command.append(Data([0x1D, 0x76, 0x30, 0x00])) // ෯ͱߴ͞ command.append(Data([UInt8(width & 0xFF), UInt8((width >> 8) & 0xFF)])) command.append(Data([UInt8(height & 0xFF), UInt8((height >> 8) & 0xFF)])) // ϏοτϚοϓσʔλ command.append(data) return command } &QTPOϨγʔτϓϦϯλʔ༻ίϚϯυͷྫ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ

// ϨγʔτΛΧοτʢ੾அʣ͢ΔίϚϯυ public func cutPaperCommand() -> Data { Data([0x1B,
0x64, 0x00]) } // ը૾Λҹ࡮͢ΔͨΊͷίϚϯυ public func bitmapCommand(_ data: Data, width: Int, height: Int) -> Data { var command = Data() // ϏοτϚοϓҹ࡮ίϚϯυ command.append(Data([0x1B, 0x58])) // ෯ͱߴ͞ command.append(Data([UInt8(width & 0xFF), UInt8((width >> 8) & 0xFF)])) command.append(Data([UInt8(height & 0xFF), UInt8((height >> 8) & 0xFF)])) // ϏοτϚοϓσʔλ command.append(data) return command } ελʔਫ਼ີϨγʔτϓϦϯλʔ༻ίϚϯυͷྫ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ

// ϨγʔτΛΧοτʢ੾அʣ͢ΔίϚϯυ public func cutPaperCommand() -> Data { Data([0x1D,
0x56, 0x00]) } // ը૾Λҹ࡮͢ΔͨΊͷίϚϯυ public func bitmapCommand(_ data: Data, width: Int, height: Int) -> Data { var command = Data() // ϏοτϚοϓҹ࡮ίϚϯυ command.append(Data([0x1D, 0x76, 0x30, 0x00])) // ෯ͱߴ͞ command.append(Data([UInt8(width & 0xFF), UInt8((width >> 8) & 0xFF)])) command.append(Data([UInt8(height & 0xFF), UInt8((height >> 8) & 0xFF)])) // ϏοτϚοϓσʔλ command.append(data) return command } &QTPOϨγʔτϓϦϯλʔ༻ίϚϯυͷྫ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ

0x64, 0x00]) } // ը૾Λҹ࡮͢ΔͨΊͷίϚϯυ public func bitmapCommand(_ data: Data, width: Int, height: Int) -> Data { var command = Data() // ϏοτϚοϓҹ࡮ίϚϯυ command.append(Data([0x1B, 0x58])) // ෯ͱߴ͞ command.append(Data([UInt8(width & 0xFF), UInt8((width >> 8) & 0xFF)])) command.append(Data([UInt8(height & 0xFF), UInt8((height >> 8) & 0xFF)])) // ϏοτϚοϓσʔλ command.append(data) return command } ελʔਫ਼ີϨγʔτϓϦϯλʔ༻ίϚϯυͷྫ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ

0x64, 0x00]) } // ը૾Λҹ࡮͢ΔͨΊͷίϚϯυ public func bitmapCommand(_ data: Data, width: Int, height: Int) -> Data { var command = Data() // ϏοτϚοϓҹ࡮ίϚϯυ command.append(Data([0x1B, 0x58])) // ෯ͱߴ͞ command.append(Data([UInt8(width & 0xFF), UInt8((width >> 8) & 0xFF)])) command.append(Data([UInt8(height & 0xFF), UInt8((height >> 8) & 0xFF)])) // ϏοτϚοϓσʔλ command.append(data) return command } ελʔਫ਼ີϨγʔτϓϦϯλʔ༻ίϚϯυͷྫ ҹ࡮͢ΔϨγʔτσʔλΛ࡞੒͢Δ %BUBܕΛฦ͢

ϨγʔτίϚϯυ͸%BUBܕ public func cutPaperCommand() -> Data { Data([0x1D, 0x56,
0x00]) } ϨγʔτϓϦϯλʔʹσʔλΛૹΔ

ϨγʔτίϚϯυ͸%BUBܕ public func cutPaperCommand() -> Data { Data([0x1D, 0x56,
0x00]) } %BUBܕΛόΠτ഑ྻʹม׵ extension Data { func toBytes() -> [UInt8] { withUnsafeBytes { (pointer: UnsafeRawBufferPointer) -> [UInt8] in let unsafeBufferPointer = pointer.bindMemory(to: UInt8.self) let unsafePointer = unsafeBufferPointer.baseAddress! return [UInt8](UnsafeBufferPointer(start: unsafePointer, count: count)) } } } ϨγʔτϓϦϯλʔʹσʔλΛૹΔ

var bytes: [UInt8] = data.toByte() ϨγʔτϓϦϯλʔʹσʔλΛૹΔ %BUBܕΛόΠτ഑ྻʹม׵͠0VUQVU4USFBNʹॻ͖ࠐΉ

var bytes: [UInt8] = data.toByte() func write() { let
session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ϨγʔτϓϦϯλʔʹσʔλΛૹΔ %BUBܕΛόΠτ഑ྻʹม׵͠0VUQVU4USFBNʹॻ͖ࠐΉ

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ϨγʔτϓϦϯλʔʹσʔλΛૹΔ &"4FTTJPO͔Β 0VUQVU4USFBNΛநग़ %BUBܕΛόΠτ഑ྻʹม׵͠0VUQVU4USFBNʹॻ͖ࠐΉ

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ϨγʔτϓϦϯλʔʹσʔλΛૹΔ σʔλʢίϚϯυʣΛ 0VUQVU4USFBNʹॻ͖ࠐΉ %BUBܕΛόΠτ഑ྻʹม׵͠0VUQVU4USFBNʹॻ͖ࠐΉ

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ϨγʔτϓϦϯλʔʹσʔλΛૹΔ ॻ͖ࠐΜͩ෼ͷσʔλΛ CZUFT͔ΒऔΓআ͘ %BUBܕΛόΠτ഑ྻʹม׵͠0VUQVU4USFBNʹॻ͖ࠐΉ

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ϨγʔτϓϦϯλʔʹσʔλΛૹΔ ॻ͖ࠐΈ͕׬ྃ͢Δ͔ ճࣦഊ͢Δ·Ͱϧʔϓ %BUBܕΛόΠτ഑ྻʹม׵͠0VUQVU4USFBNʹॻ͖ࠐΉ

J04ΞϓϦ͔ΒϨγʔτϓϦϯλʔʹϨγʔτσʔλΛૹ৴͢Δํ๏ ϨγʔτϓϦϯλʔʹσʔλΛૹΔ

J04ΞϓϦ͔ΒϨγʔτϓϦϯλʔʹϨγʔτσʔλΛૹ৴͢Δํ๏ ϨγʔτϓϦϯλʔʹσʔλΛૹΔ ˠ4USFBN"1*Λར༻

J04ΞϓϦ͔ΒϨγʔτϓϦϯλʔʹϨγʔτσʔλΛૹ৴͢Δํ๏ ϨγʔτϓϦϯλʔʹσʔλΛૹΔ ˠ4USFBN"1*Λར༻ 🤔

ෳ਺ͷϝʔΧʔΛαϙʔτ 4USFBN"1*Λར༻͢Δ

4USFBN"1*ͱ͸ ɾ'PVOEBUJPOϑϨʔϜϫʔΫͷ࢓૊Έ ɾ4XJGUͰσʔλͷಡΈॻ͖ΛඇಉظͰ࣮ࢪ ɾެࣜʹ͸'PVOEBUJPO4USFBNTͱදݱ ɾຊτʔΫͰ͸૯শͱͯ͠4USFBN"1*ͱදݱ

ɾ&YUFSOBM"DDFTTPSZ'SBNFXPSLʹ͓͚Δඪ४తͳΠϯλʔϑΣʔε ɾϨγʔτϓϦϯλʔ͸Ұ౓ʹେྔͷσʔλͷड৴͕ෆՄ ˠ4USFBN"1*Ͱૹड৴Մೳ͔Ͳ͏͔ΠϕϯτͰ؅ཧ͍ͨ͠ ɾϨγʔτϓϦϯλʔͱͷ௨৴Ͱ͸૒ํ޲ͷ΍ΓͱΓ͕ॏཁ ˠΞϓϦ͔Βҹ࡮σʔλΛૹ৴͠ͳ͕Βҹ࡮׬ྃɾΤϥʔΛड৴͍ͨ͠ ͳͥ4USFBN"1*ʁ

4USFBN"1*ͱ͸ 0VUQVU4USFBN ɾΞϓϦ͔ΒσʔλΛૹ৴͢ΔͨΊͷ௨৴νϟϯωϧ ɾྫɿϓϦϯλʔ΁ҹ࡮ίϚϯυΛૹ৴ *OQVU4USFBN ɾ֎෦͔ΒΞϓϦʹσʔλΛड৴͢ΔͨΊͷ௨৴νϟϯωϧ ɾྫɿϓϦϯλʔ͔Βҹ࡮׬ྃɾΤϥʔ௨஌Λड৴

4USFBN"1*ͱ͸ 0VUQVU4USFBN Ҿ༻ɿIUUQTSFHJGBRTUPSFTKQIDKBBSUJDMFT *OQVU4USFBN Ϩγʔτҹ࡮ίϚϯυ ҹ࡮׬ྃɾΤϥʔ௨஌

4USFBN"1*ͱ͸ 4USFBN%FMFHBUF ɾΠϕϯτۦಈͰ4USFBNͷঢ়ଶΛ؂ࢹ ɾΠϕϯτ 4USFBN&WFOU ͷछྨ PQFO$PNQMFUFE 4USFBNΛ։࢝ͨ͠ IBT#ZUFT"WBJMBCMF
*OQVU4USFBNͰಡΈऔΓՄೳͳσʔλ͕౸ணͨ͠ IBT4QBDF"WBJMBCMF 0VUQVU4USFBNͷॻ͖ࠐΈ͕Մೳʹͳͬͨ FSSPS0DDVSSFE 4USFBNͷૢ࡞தʹΤϥʔ͕ൃੜͨ͠ FOE&ODPVOUFSFE 4USFBN͕ਖ਼ৗʹऴྃͨ͠

4USFBNͷ࣮૷ྫɿΫϥεશମ final class PrinterStream: NSObject, StreamDelegate { private let
session: EASession init(session: EASession) { self.session = session } func openStreams() { // OutputStreamઃఆ session.outputStream?.delegate = self session.outputStream?.schedule( in: .main, forMode: .common ) session.outputStream?.open() // InputStreamઃఆ session.inputStream?.delegate = self session.inputStream?.schedule( in: .main, forMode: .common ) session.inputStream?.open() } func closeStreams() { // OutputStreamऴྃ session.outputStream?.close() session.outputStream?.remove( from: .main, forMode: .common ) session.outputStream?.delegate = nil // InputStreamऴྃ session.inputStream?.close() session.inputStream?.remove( from: .main, forMode: .common ) session.inputStream?.delegate = nil } func stream(_ aStream: Stream, handle eventCode: Stream.Event) { switch aStream { case _ as OutputStream: // OutputStream ͷϋϯυϦϯά case _ as InputStream: // inputStream ͷϋϯυϦϯά default: break } }

4USFBNͷϥΠϑαΠΫϧ &"4FTTJPOͷ࡞੒ $PO fi HVSBUJPOͷઃఆ 4USFBNͷ։࢝ σʔλͷૹड৴ɾΠϕϯτॲཧ 4USFBNͷऴྃ

4USFBNͷϥΠϑαΠΫϧ &"4FTTJPOͷ࡞੒ $PO fi HVSBUJPOͷઃఆ 4USFBNͷ։࢝ σʔλͷૹड৴ɾΠϕϯτॲཧ 4USFBNͷऴྃ func
startSession() { guard let session = EASession( accessory: accessory, forProtocol: protocolString) else { return } … }

startSession() { guard let session = EASession( accessory: accessory, forProtocol: protocolString) else { return } … } ֎෦઀ଓΞΫηαϦ ϨγʔτϓϦϯλʔ

startSession() { guard let session = EASession( accessory: accessory, forProtocol: protocolString) else { return } … } ௨৴ϓϩτίϧจࣈྻ ɾ&QTPODPNFQTPOFTDQPT ɾελʔਫ਼ີKQTUBSNTUBSQSP

4USFBNͷϥΠϑαΠΫϧ &"4FTTJPOͷ࡞੒ $PO fi HVSBUJPOͷઃఆ 4USFBNͷ։࢝ σʔλͷૹड৴ɾΠϕϯτॲཧ 4USFBNͷऴྃ private
let session: EASession func openStreams() { session.outputStream?.delegate = self session.outputStream?.schedule( in: .main, forMode: .common ) …

let session: EASession func openStreams() { session.outputStream?.delegate = self session.outputStream?.schedule( in: .main, forMode: .common ) … 4USFBN%FMFHBUFͷઃఆ

let session: EASession func openStreams() { session.outputStream?.delegate = self session.outputStream?.schedule( in: .main, forMode: .common ) … 3VO-PPQΛొ࿥

let session: EASession func openStreams() { session.outputStream?.delegate = self session.outputStream?.schedule( in: .main, forMode: .common ) … 3VO-PPQΛొ࿥ 4USFBNΛ ϝΠϯεϨουͰॲཧ

let session: EASession func openStreams() { … session.outputStream?.open() }

let session: EASession func openStreams() { … session.outputStream?.open() } 4USFBNͷ։࢝

4USFBNͷϥΠϑαΠΫϧ &"4FTTJPOͷ࡞੒ $PO fi HVSBUJPOͷઃఆ 4USFBNͷ։࢝ σʔλͷૹड৴ɾΠϕϯτॲཧ 4USFBNͷऴྃ final
class PrinterStream: …, StreamDelegate { … func stream(_ aStream: Stream, handle eventCode: Stream.Event) { … switch aStream { case _ as OutputStream: // OutputStream ͷϋϯυϦϯά default: break …

class PrinterStream: …, StreamDelegate { … func stream(_ aStream: Stream, handle eventCode: Stream.Event) { … switch aStream { case _ as OutputStream: // OutputStream ͷϋϯυϦϯά default: break … 4USFBN&WFOU͕ ݺ͹ΕΔ PQFO$PNQMFUFE 4USFBNΛ։࢝ͨ͠ IBT#ZUFT"WBJMBCMF *OQVU4USFBNͰಡΈऔΓՄೳͳσʔλ͕౸ணͨ͠ IBT4QBDF"WBJMBCMF 0VUQVU4USFBNͷॻ͖ࠐΈ͕Մೳʹͳͬͨ FSSPS0DDVSSFE 4USFBNͷૢ࡞தʹΤϥʔ͕ൃੜͨ͠ FOE&ODPVOUFSFE 4USFBN͕ਖ਼ৗʹऴྃͨ͠

class PrinterStream: …, StreamDelegate { … func stream(_ aStream: Stream, handle eventCode: Stream.Event) { … switch aStream { case _ as OutputStream: // OutputStream ͷϋϯυϦϯά default: break … 4USFBNͷ ϋϯυϦϯάΛ࣮ࢪ PQFO$PNQMFUFE 4USFBNΛ։࢝ͨ͠ IBT#ZUFT"WBJMBCMF *OQVU4USFBNͰಡΈऔΓՄೳͳσʔλ͕౸ணͨ͠ IBT4QBDF"WBJMBCMF 0VUQVU4USFBNͷॻ͖ࠐΈ͕Մೳʹͳͬͨ FSSPS0DDVSSFE 4USFBNͷૢ࡞தʹΤϥʔ͕ൃੜͨ͠ FOE&ODPVOUFSFE 4USFBN͕ਖ਼ৗʹऴྃͨ͠

let session: EASession func closeStreams() { … session.outputStream?.close() session.outputStream?.remove( from: .main, forMode: .common ) session.outputStream?.delegate = nil }

let session: EASession func closeStreams() { … session.outputStream?.close() session.outputStream?.remove( from: .main, forMode: .common ) session.outputStream?.delegate = nil } 4USFBNͷऴྃ

let session: EASession func closeStreams() { … session.outputStream?.close() session.outputStream?.remove( from: .main, forMode: .common ) session.outputStream?.delegate = nil } $PO fi HVSBUJPOઃఆͷ࡟আ

4USFBNͷϥΠϑαΠΫϧ &"4FTTJPOͷ࡞੒ $PO fi HVSBUJPOͷઃఆ 4USFBNͷ։࢝ σʔλͷૹड৴ɾΠϕϯτॲཧ 4USFBNͷऴྃ ϨγʔτϓϦϯλʔͱͷ
ηογϣϯ͕ܧଓ͍ͯ͠Ε͹ ʙ͸܁Γฦ࣮͠ߦͰ͖Δ

ʢ࠶ܝʣ4USFBN"1*ͱ͸ 0VUQVU4USFBN Ҿ༻ɿIUUQTSFHJGBRTUPSFTKQIDKBBSUJDMFT *OQVU4USFBN Ϩγʔτҹ࡮ίϚϯυ ҹ࡮׬ྃɾΤϥʔ௨஌

ϨγʔτϓϦϯλʔʹσʔλΛૹΔ

Ϩγʔτҹ࡮ͷઆ໌Λऴ͑ͯ w 4%,Λ࢖ΘͣʹϨγʔτϓϦϯλʔͰҹ࡮͢Δํ๏Λ঺հ͠·ͨ͠ w ͜ΕʹΑΓෳ਺ͷϝʔΧʔΛαϙʔτ͢Δ͜ͱ͕ՄೳʹͳΓ·ͨ͠

͓͠·͍ ຊτʔΫɺ׬ʂ

͓͠·͍ʜͰ͸ͳ͍ʂ ຊτʔΫɺ·ͩ·͖ͩͭͮ·͢

Ϩγʔτҹ࡮్͕தͰࢭ·Δෆ۩߹

Ϩγʔτҹ࡮ͷෆ۩߹ ɾ4XJGUରԠͰϨγʔτҹ࡮ॲཧͷվमΛߦ͍2"Λ࣮ࢪ ɾϨγʔτҹ࡮్͕தͰఀࢭ͢Δෆ۩߹͕ൃੜ ɾվमલ·Ͱਖ਼ৗʹಈ࡞͠ ϨγʔτϓϦϯλʔͱͷ઀ଓ΋ྑ޷

Ϩγʔτҹ࡮ͷෆ۩߹

ҹ࡮͕ਖ਼ৗʹ׬ྃ ҹ࡮్͕தͰఀࢭ Ϩγʔτҹ࡮ͷෆ۩߹

ҹ࡮͕ਖ਼ৗʹ׬ྃ ҹ࡮్͕தͰఀࢭ Ϩγʔτҹ࡮ͷෆ۩߹ ͍͍ͬͨͳͥఀࢭ͢Δʁ

ݪҼΛௐࠪ ɾෳ਺ͷϨγʔτϓϦϯλʔͰ࠶ݱ͢Δ͔ݕূ ɾϨγʔτҹ࡮࣌ͷΤϥʔϩά͕ग़ྗ͞Ε͍ͯΔ͔֬ೝ ɾҹ࡮ॲཧͷͲ͜Ͱఀࢭ͍ͯ͠Δ͔ௐࠪ

ௐࠪΛͯ͠Θ͔ͬͨ͜ͱ ɾෳ਺ͷϝʔΧʔ੡ϓϦϯλʔͰಉ༷ͷෆ۩߹͕ൃੜ ɾϓϦϯλʔ΁ͷϨγʔτσʔλͷૹ৴͕Ұ࣌ఀࢭ͍ͯ͠Δ͜ͱ͕ൃ֮

var bytes: [UInt8] = data.toByte() func write() { let session:
EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ௐࠪΛͯ͠Θ͔ͬͨ͜ͱ ॻ͖ࠐΈΛϧʔϓͰॲཧ

EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ௐࠪΛͯ͠Θ͔ͬͨ͜ͱ ॻ͖ࠐΈ͕#ZUFͷͨΊࣦഊ

EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ௐࠪΛͯ͠Θ͔ͬͨ͜ͱ ճࣦഊͨͨ͠Ίϧʔϓऴྃ

EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ௐࠪΛͯ͠Θ͔ͬͨ͜ͱ ճࣦഊͨͨ͠Ίϧʔϓऴྃ ॻ͖ࠐΈʹࣦഊ͠ଓ͚ͯ ϧʔϓ͕ऴྃ͠ ์ஔঢ়ଶʹͳ͍ͬͯͨ

EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ͪͳΈʹҹ࡮͕ఀࢭ͢Δͱʜ ॻ͖ࠐΈͨ͠෼ΛCZUFT͔Β࡟আ

EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } ͪͳΈʹҹ࡮͕ఀࢭ͢Δͱʜ ϧʔϓ͸ऴ͕ྃͨ͠σʔλ͸࢒ଘ

ҹ࡮͕ఀࢭͷঢ়ଶͰ͞Βʹҹ࡮Λ͢Δͱʜ

ʢ࠶ܝʣௐࠪΛͯ͠Θ͔ͬͨ͜ͱ ɾෳ਺ͷϝʔΧʔ੡ϓϦϯλʔͰಉ༷ͷෆ۩߹͕ൃੜ ɾϓϦϯλʔ΁ͷϨγʔτσʔλͷૹ৴͕Ұ࣌ఀࢭ͍ͯ͠Δ͜ͱ͕ൃ֮

ʢ࠶ܝʣௐࠪΛͯ͠Θ͔ͬͨ͜ͱ ɾෳ਺ͷϝʔΧʔ੡ϓϦϯλʔͰಉ༷ͷෆ۩߹͕ൃੜ ɾϓϦϯλʔ΁ͷϨγʔτσʔλͷૹ৴͕Ұ࣌ఀࢭ͍ͯ͠Δ͜ͱ͕ൃ֮ ͦ΋ͦ΋ͳͥ ॻ͖ࠐΈʹࣦഊ͢Δʁ

Ϩγʔτҹ࡮ͷσʔλྔΛϩάͰ֬ೝ Ϩγʔτσʔλ૯ྔɹɹ #ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ʙճ໨ͷॻ͖ࠐΈ
#ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ճ໨Ҏ߱ͷॻ͖ࠐΈ #ZUF ࢒Γͷσʔλྔ #ZUF &QTPO5.Nͷ৔߹

Ϩγʔτҹ࡮ͷσʔλྔΛϩάͰ֬ೝ Ϩγʔτσʔλ૯ྔɹɹ #ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ʙճ໨ͷॻ͖ࠐΈ
#ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ճ໨Ҏ߱ͷॻ͖ࠐΈ #ZUF ࢒Γͷσʔλྔ #ZUF &QTPO5.Nͷ৔߹ ɾճ໨ ճ໨Ͱॻ͖ࠐΈ༗ ɾॻ͖ࠐΈࣦഊ͕໨ཱͭ ɾ໿͕ॻ͖ࠐΈͰ͖ͣ

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ɾॻ͖ࠐΉσʔλྔͷ෺ཧతͳ੍ݶɿ #ZUF CJU ͷ৐ʣ ɾճ໨ͷ #ZUFͷॻ͖ࠐΈͰ੍ݶʹ౸ୡͯ͠͠·ͬͨ ɾ੍ݶʹ౸ୡ͢ΔओͳཁҼ ɾ&"4FTTJPOͷ0VUQVU4USFBNόοϑΝαΠζ੍ݶ
ɾϓϦϯλʔϋʔυ΢ΣΞଆͷड৴όοϑΝ੍ݶ ɾ#MVFUPPUI௨৴ϓϩτίϧͷ੍ݶ

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ Ϩγʔτσʔλ૯ྔɹɹ #ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ʙճ໨ͷॻ͖ࠐΈ
#ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ճ໨Ҏ߱ͷॻ͖ࠐΈ #ZUF ࢒Γͷσʔλྔ #ZUF

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ Ϩγʔτσʔλ૯ྔɹɹ #ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ʙճ໨ͷॻ͖ࠐΈ
#ZUF ճ໨ͷॻ͖ࠐΈ #ZUF ճ໨Ҏ߱ͷॻ͖ࠐΈ #ZUF ࢒Γͷσʔλྔ #ZUF 🤔

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ 0VUQVU4USFBN

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ɾճ໨ɹɿ #ZUFॻ͖ࠐΈʢຬഋʣ 0VUQVU4USFBN

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ɾճ໨ɹɿ #ZUFॻ͖ࠐΈʢຬഋʣ ɾʙճ໨ɿຬഋͷͨΊॻ͖ࠐΈෆՄ 0VUQVU4USFBN

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ɾճ໨ɹɿ #ZUFॻ͖ࠐΈʢຬഋʣ ɾʙճ໨ɿຬഋͷͨΊॻ͖ࠐΈෆՄ ɾճ໨ɹɹϓϦϯλʔ͕Ұ෦σʔλΛॲཧ ɹɹɹɹɹɹۭ͖͕ൃੜ͠ #ZUFॻ͖ࠐΈ 0VUQVU4USFBN

Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ɾճ໨ɹɿ #ZUFॻ͖ࠐΈʢຬഋʣ ɾʙճ໨ɿຬഋͷͨΊॻ͖ࠐΈෆՄ ɾճ໨ɹɹϓϦϯλʔ͕Ұ෦σʔλΛҹ࡮ ɹɹɹɹɹɹۭ͖͕ൃੜ͠ #ZUFॻ͖ࠐΈ ɾճ໨ʙɹ ϓϦϯλʔҹ࡮͕σʔλॲཧʹ௥͍͔ͭͳ͍
ಉظతͳϙʔϦϯά XIJMFจ Ͱ͸ 0VUQVU4USFBNͷۭ͖Λద੾ʹݕग़Ͱ͖ͳ͍ 0VUQVU4USFBN

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } 0VUQVU4USFBNͷۭ͖Λݕग़Ͱ͖ͳ͍ཧ༝ ʢ࠶ܝʣ%BUBܕΛ6*OUܕ഑ྻʹม׵͠Ҿ਺ʹ౉͢

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ʢ࠶ܝʣ%BUBܕΛ6*OUܕ഑ྻʹม׵͠Ҿ਺ʹ౉͢ ɾಉظతͳϧʔϓॲཧͰ0VUQVU4USFBNΛϙʔϦϯά ɾ0VUQVU4USFBNͷঢ়ଶมԽΛϦΞϧλΠϜͰ؂ࢹͰ͖ͳ͍ʂ ɾϓϦϯλʔͷॲཧͱΞϓϦؒͰಉظ͕औΕͳ͍

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ʢ࠶ܝʣ%BUBܕΛ6*OUܕ഑ྻʹม׵͠Ҿ਺ʹ౉͢ ɾಉظతͳϧʔϓॲཧͰ0VUQVU4USFBNΛϙʔϦϯάʜ ɾ0VUQVU4USFBNͷঢ়ଶมԽΛϦΞϧλΠϜͰ؂ࢹͰ͖ͳ͍ʂ ɾϓϦϯλʔͷॲཧͱಉظ͕औΕͳ͍ 0VUQVU4USFBNͷ ঢ়ଶมԽΛ؂ࢹ͢Δ ࢓૊Έ͕ඞཁʂ

session: EASession let failedLimit: UInt = 10 var failedCount: UInt = 0 while let outputStream = session.outputStream, failedCount < failedLimit { let writtenBytes = outputStream.write(bytes, maxLength: bytes.count) if writtenBytes > 0 { let toRange = min(bytes.count, Int(writtenBytes)) bytes.removeSubrange(0 ..< toRange) } else { failedCount += 1 } } } Ϩγʔτσʔλͷॻ͖ࠐΈ͕ਐ·ͳ͍ݪҼ ʢ࠶ܝʣ%BUBܕΛ6*OUܕ഑ྻʹม׵͠Ҿ਺ʹ౉͢ ɾಉظతͳϧʔϓॲཧͰ0VUQVU4USFBNΛϙʔϦϯάʜ ɾ0VUQVU4USFBNͷঢ়ଶมԽΛϦΞϧλΠϜͰ؂ࢹͰ͖ͳ͍ʂ ɾϓϦϯλʔͷॲཧͱಉظ͕औΕͳ͍ 4USFBN&WFOUͷग़൪ʂ

0VUQVU4USFBNͷঢ়ଶมԽΛ؂ࢹ͢Δղܾࡦ final class PrinterStream: …, StreamDelegate { … func
stream(_ aStream: Stream, handle eventCode: Stream.Event) { … switch aStream { case _ as OutputStream: // OutputStream ͷϋϯυϦϯά default: break } }

stream(_ aStream: Stream, handle eventCode: Stream.Event) { … switch aStream { case _ as OutputStream: switch eventCode { case .hasSpaceAvailable: // OutputStream΁ͷॻ͖ࠐΈΛ࠶։ write() } default: break }

stream(_ aStream: Stream, handle eventCode: Stream.Event) { … switch aStream { case _ as OutputStream: switch eventCode { case .hasSpaceAvailable: // OutputStream΁ͷॻ͖ࠐΈΛ࠶։ write() } default: break } 0VUQVU4USFBNͷ ॻ͖ࠐΈ͕Մೳʹͳͬͨ

stream(_ aStream: Stream, handle eventCode: Stream.Event) { … switch aStream { case _ as OutputStream: switch eventCode { case .hasSpaceAvailable: // OutputStream΁ͷॻ͖ࠐΈΛ࠶։ write() } default: break }

ෆ۩߹ͷमਖ਼ޙʜ

ෆ۩߹ͷमਖ਼ޙʜ Ϩγʔτҹ࡮Ͱ͖ͨ👏

ຊτʔΫͰ࿩͢͜ͱ ϨγʔτϓϦϯλʔͷ঺հ ෳ਺ϝʔΧʔΛαϙʔτ Ϩγʔτҹ࡮్͕தͰࢭ·Δෆ۩߹ ·ͱΊ

·ͱΊ

·ͱΊ ɾ#MVFUPPUI઀ଓͨ͠ϨγʔτϓϦϯλʔͷҹ࡮ํ๏Λղઆ͠·ͨ͠ ɾ4USFBN"1*Ͱෳ਺ϝʔΧʔ੡ϨγʔτϓϦϯλʔͷαϙʔτΛ࣮ݱ͠·ͨ͠ ɾϨγʔτҹ࡮్͕தͰࢭ·Δෆ۩߹ͷݪҼௐࠪΛߦ͍·ͨ͠ ɾݪҼ͸0VUQVU4USFBN΁ͷॻ͖ࠐΈʹ੍ݶ͕͋ͬͨ͜ͱ ɾղܾࡦ͸4USFBN&WFOUΛ؂ࢹ͠ҹ࡮ॲཧΛ࠶࣮ߦ͢Δ͜ͱ

εϙϯαʔϒʔεʹͯϨγʔτҹ࡮ମݧͰ͖·͢

࠷ޙʹͻͱ͜ͱ ϧʔϧΛकָͬͯ͘͠ ϨγʔτΛҹ࡮͠Α͏ʂ

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ ΞϑλʔΠϕϯτ΍Γ·͢ʂͥͻ͝ࢀՃ͍ͩ͘͞ʂ

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