iOSでQRコード生成奮闘記

2025.03.04 集まれSwift好き！Swift愛好会 vol.92 @DeNA

1. iOSͰQRίʔυੜ੒ฃಆه 2025.03.04 ू·ΕSwift޷͖ʂSwiftѪ޷ձ vol.92 @DeNA Ryomm / Ryoko Matsusaka
2. Ryomm / Ryoko Matsusaka ͦͷଞ: Ryomm : @__ryomm KINTOςΫϊϩδʔζגࣜձࣾॴଐ iOSΞϓϦΤϯδχϟ
3. iOSͰQRίʔυΛੜ੒͍ͨ͠ʂ
4. func qrCode(data: Data?) -" UIImage? { let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data, let filter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data, "inputCorrectionLevel": "Q"]), let ciImage = filter.outputImage?.transformed(by: transform) let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) } https://developer.apple.com/documentation/coreimage/cifilter https://developer.apple.com/documentation/coreimage/ciqrcodegenerator
5. func qrCode(data: Data?) -" UIImage? { let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data, let filter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data, "inputCorrectionLevel": "Q"]), let ciImage = filter.outputImage?.transformed(by: transform) let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) } https://developer.apple.com/documentation/coreimage/cifilter https://developer.apple.com/documentation/coreimage/ciqrcodegenerator
6. func qrCode(data: Data?) -" UIImage? { let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data, let filter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data, "inputCorrectionLevel": "Q"]), let ciImage = filter.outputImage?.transformed(by: transform) let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) } https://developer.apple.com/documentation/coreimage/cifilter https://developer.apple.com/documentation/coreimage/ciqrcodegenerator
7. ࣄ݅Ͱ͢ʂ
8. iOS18ͰQRίʔυ͕දࣔͰ͖ͯͳ͍ͬΆ͍Ͱ͢ʂ ʂ
9. ? Ͱ΋100%࠶ݱ͢ΔΘ͚͡Όͳ͍Ͱ͢ʂ
10. func qrCode(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16), let string = String(byte: bint.getBytes(), encoding: .utf16BigEndian) else { return nil } let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data = string.data(using: encoding), let QRFilter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) }
11. func qrCode(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16), let string = String(byte: bint.getBytes(), encoding: .utf16BigEndian) else { return nil } let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data = string.data(using: encoding), let QRFilter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) } func qrCode(of binary: String) -" UIImage?
12. func qrCode(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16), let string = String(byte: bint.getBytes(), encoding: .utf16BigEndian) else { return nil } let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data = string.data(using: encoding), let QRFilter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) } func qrCode(of binary: String) -" UIImage?
13. 23ίʔυʹೖΕΒΕΔ΋ͷ ਺ࣈ ӳ਺ه߸ 8bit ׽ࣈ Ϟʔυ όΠφϦΛ֨ೲՄೳ
14. func qrCode(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16), let string = String(byte: bint.getBytes(), encoding: .utf16BigEndian) else { return nil } let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data = string.data(using: encoding), let QRFilter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) }
15. String(16ਐ਺) "6e79dc68" BInt(10ਐ਺) 1853480040 String “㧅`“ Data 6e79616e ṖͷόΠφϦX import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000]
16. String(16ਐ਺) "6e79dc68" BInt(10ਐ਺) 1853480040 Data 6e79616e ṖͷόΠφϦX String “㧅`“ Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian)
17. String(16ਐ਺) "6e79dc68" ṖͷόΠφϦX import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) Data 6e79616e
18. String(16ਐ਺) "6e79dc68" Data 0×3665373964633638 Data 6e79616e ṖͷόΠφϦX let binary = "6e79dc68" let data = binary.data(using: .utf8)
19. String(16ਐ਺) "6e79dc68" BInt(10ਐ਺) 1853480040 ṖͷόΠφϦX 8όΠτͷ੔਺Λ֨ೲ͢Δσʔλܕ import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) Data 6e79616e
20. String(16ਐ਺) "6e79dc68" BInt(10ਐ਺) 1853480040 ṖͷόΠφϦX 8όΠτͷ੔਺Λ֨ೲ͢Δσʔλܕ Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] 2ਐ਺Ͱ8Ϗοτ·Ͱ֨ೲͰ͖Δܕ import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) 1101110011110011101110001101000 Data 6e79616e
21. String(16ਐ਺) "6e79dc68" BInt(10ਐ਺) 1853480040 ṖͷόΠφϦX 8όΠτͷ੔਺Λ֨ೲ͢Δσʔλܕ Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] 2ਐ਺Ͱ8Ϗοτ·Ͱ֨ೲͰ͖Δܕ import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) String “㧅`“ Data 6e79616e
22. BInt(10ਐ਺) 1853480040 Data 6e79616e ṖͷόΠφϦX 8όΠτͷ੔਺Λ֨ೲ͢Δσʔλܕ String(16ਐ਺) "6e79dc68" String “㧅`“ Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] 2ਐ਺Ͱ8Ϗοτ·Ͱ֨ೲͰ͖Δܕ import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian)
23. BInt(10ਐ਺) 1853480040 Data 6e79616e ṖͷόΠφϦX 8όΠτͷ੔਺Λ֨ೲ͢Δσʔλܕ String(16ਐ਺) "6e79dc68" String “㧅`“ Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] 2ਐ਺Ͱ8Ϗοτ·Ͱ֨ೲͰ͖Δܕ import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian)
24. Data 6e79616e ṖͷόΠφϦX String(16ਐ਺) "6e79dc68" String “㧅`“ Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] 2ਐ਺Ͱ8Ϗοτ·Ͱ֨ೲͰ͖Δܕ BInt(10ਐ਺) 1853480040 8όΠτͷ੔਺Λ֨ೲ͢Δσʔλܕ import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) iOS17·Ͱ͸͜ΕͰ໰୊ͳ͔ͬͨᴷᴷᴷᴷᴷᴷ
25. BInt(10ਐ਺) 1853480040 String nil Data 6e79616e ṖͷόΠφϦX 8όΠτͷ੔਺Λ֨ೲ͢Δσʔλܕ String(16ਐ਺) "6e79dc68" import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bing?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] 2ਐ਺Ͱ8Ϗοτ·Ͱ֨ೲͰ͖Δܕ wow
26. ࢀߟ: https://zenn.dev/iceman/articles/412958c97a9f44 swift-corelibs-foundation Foundation AppleϓϥοτϑΥʔϜ޲͚ AppleҎ֎ͷϓϥοτϑΥʔϜ޲͚ ґଘ CoreFoundation Cݴޠ੡಺෦࣮૷
27. ࢀߟ: https://zenn.dev/iceman/articles/412958c97a9f44 swift-corelibs-foundation Foundation AppleϓϥοτϑΥʔϜ޲͚ AppleҎ֎ͷϓϥοτϑΥʔϜ޲͚ CoreFoundation Cݴޠ੡಺෦࣮૷ ґଘ swift-foundation Swift੡಺෦࣮૷
28. ʙiOS17 iOS18ʙ Special thanks: Iceman͞Μ Foundation Swift5࣌୅ͷ΋ͷ CoreFoundation swift-foundation Foundation Swift6࣌୅ͷ΋ͷ
29. Special thanks: omochimetal͞Μ 6e79 dc68 αϩήʔτϖΞͷยׂΕ let binary = "6e79dc68" /* ... */ let string = String(bytes: bytes!, encoding: .utf16BigEndian) αϩήʔτϖΞ ্Ґαϩήʔτ D800ʙDBFF ԼҐαϩήʔτ DC00ʙDFFF + αϩήʔτϖΞҎ֎Ͱσίʔυࣦഊ͠ͳ͍ ΋͏Ұํ͸ʁ
30. σίʔυࣦഊ࣌ͷ஋ String nil String “㧅`“ CoreFoundation swift-foundation let binary = "6e79dc68" /* ... */ let string = String(bytes: bytes!, encoding: .utf16BigEndian)
31. Ͱ΋100%࠶ݱ͢ΔΘ͚͡Όͳ͍Ͱ͢ʂ ͨ·ͨ·σίʔυͰ͖Δ࣌΋͋ͬͨɺ ͱ͍͏͜ͱ͔…
32. BInt(10ਐ਺) 1853480040 String nil Data 6e79616e ṖͷόΠφϦX String(16ਐ਺) "6e79dc68" import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bing?.getBytes() let string = String(bytes: bytes!, encoding: .utf16BigEndian) let data = string?.data(using: .utf16BigEndian) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] ԿͰΤϯίʔυ͞Εͨ΋ͷ͔ Θ͔Βͳ͍ ͳΜͰ΋͍͍͔Β Ұ୴σίʔυ͍ͨ͠
33. let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string: String? = if let str = String(bytes: bytes!, encoding: .utf16BigEndian) { str } else if let str = String(bytes: bytes!, encoding: .utf16LittleEndian) { str } else if let str = String(bytes: bytes!, encoding: .utf16) { str } else if let str = String(bytes: bytes!, encoding: .isoLatin1) { str } else { nil }
34. let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string: String? = if let str = String(bytes: bytes!, encoding: .utf16BigEndian) { str } else if let str = String(bytes: bytes!, encoding: .utf16LittleEndian) { str } else if let str = String(bytes: bytes!, encoding: .utf16) { str } else if let str = String(bytes: bytes!, encoding: .isoLatin1) { str } else { nil } ૯౰ͨΓ େ࡞ઓ
35. BInt(10ਐ਺) 1853480040 String ṖͷόΠφϦX import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string: String? = if let str = String( bytes: bytes!, encoding: .???) { str } else { ... } let data = string?.data(using: .???) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] Data 6e79616e String(16ਐ਺) "6e79dc68"
37. BInt(10ਐ਺) 1853480040 String ṖͷόΠφϦX import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bint?.getBytes() let string: String? = if let str = String( bytes: bytes!, encoding: .???) { str } else { ... } let data = string?.data(using: .???) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] Data 6e79616e String(16ਐ਺) "6e79dc68" ͳΜͰ΋͍͍͔Β Ұ୴σίʔυ͍ͨ͠
38. BInt(10ਐ਺) 1853480040 String ṖͷόΠφϦX import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes = bing?.getBytes() let string: String? = if let str = String( bytes: bytes!, encoding: .???) { str } else { ... } let data = string?.data(using: .???) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] Data 6e79616e String(16ਐ਺) "6e79dc68" ͳΜͰ΋͍͍͔Β Ұ୴σίʔυ͍ͨ͠ ͜Ε͍Δʁ
39. ࢀߟ: https://developer.hatenastaff.com/entry/swift-3-foundation-data-and-pointer FoundationͷData͸ɺόΠτྻΛදݱ͢ΔͨΊͷܕͰ͢ɻ چདྷͷNSData΍NSMutableDataʹରԠ͠·͢ɻ Data͸1όΠτΛද͢UInt8ܕͷྻͱͯ͠΋ৼΔ෣͍ɺ ·ͨ಺෦ͷϝϞϦྖҬΛࢦ͢ϙΠϯλΛ৮Δ͜ͱ͕Ͱ͖·͢ɻ
40. %BUBܕͬͯ6*OUͷ഑ྻͳΜ͔͍ᴷᴷᴷᴷᴷᴷ
41. BInt(10ਐ਺) 1853480040 ṖͷόΠφϦX import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes: [UInt8] = bint?.getBytes() let data: Data = Data(bytes) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] Data 6e79616e String(16ਐ਺) "6e79dc68"
42. BInt(10ਐ਺) 1853480040 ṖͷόΠφϦX import BigNumber let binary = "6e79dc68" let bint = BInt(binary, radix: 16) let bytes: [UInt8] = bing?.getBytes() let data: Data = Data(bytes) Bytes / [UInt8] [01101110, 01111001, 11011100, 1101000] Data 6e79616e String(16ਐ਺) "6e79dc68"
43. func qrCode(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16) else { return nil } let bytes: [UInt8] = bint.getBytes() let data: Data = Data(bytes) let transform = CGAffineTransform(scaleX: 10, y: 10) guard let QRFilter = CIFilter(name: ”CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) }
44. ࣄ݅Ͱ͢ʂ
45. දࣔ͸Ͱ͖Δ͚ͲಡΈऔΕͳ͍Ͱ͢ʂ ʂ
46. 23ίʔυͷόʔδϣϯ
47. 23ίʔυͷόʔδϣϯ όʔδϣϯ1 21×21 (M)14byte όʔδϣϯ10 57×57 (M)213byte όʔδϣϯ40 177×177 (M)2,331byte όʔδϣϯ5 37×37 (M)84byte ࢀߟ: https://www.qrcode.com/about/version.html
48. func qrCode(data: Data?) -" UIImage? { let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data, let filter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data, "inputCorrectionLevel": "Q"]), let ciImage = filter.outputImage?.transformed(by: transform) let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) }
49. ʂ
50. Data 1234123412 Data 123…………..234 ʂ
51. func qrCodeVersion5(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16) else { return nil } let bytes: [UInt8] = bint.getBytes() let maxBinaryLength = 84 let shortage = maxBinaryLength - bytes.count if shortage > 0 { bytes.insert(contentsOf: Array(repeating: 0, count: shortage), at: 0) } let data: Data = Data(bytes) guard let QRFilter = CIFilter(name: ”CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) }
52. func qrCodeVersion5(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16) else { return nil } let bytes: [UInt8] = bint.getBytes() let maxBinaryLength = 84 let shortage = maxBinaryLength - bytes.count if shortage > 0 { bytes.insert(contentsOf: Array(repeating: 0, count: shortage), at: 0) } let data: Data = Data(bytes) guard let QRFilter = CIFilter(name: ”CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) }
53. func qrCodeVersion5(of binary: String) -" UIImage? { guard let bint = BInt(binary, radix: 16) else { return nil } let bytes: [UInt8] = bint.getBytes() let maxBinaryLength = 84 let shortage = maxBinaryLength - bytes.count if shortage > 0 { bytes.insert(contentsOf: Array(repeating: 0, count: shortage), at: 0) } let data: Data = Data(bytes) guard let QRFilter = CIFilter(name: ”CIQRCodeGenerator”, parameters: ["inputMessage": data]), let ciImage = QRFilter.outputImage?.transformed(by: transform), let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } return UIImage(cgImage: cgImage) }
54. ·ͱΊ w 23ίʔυը૾Λίϯτϩʔϧ͢Δʹ͸ɺؚΊΔσʔλΛ͍͍͡͡ ͢ΔͱେମԿͱ͔ͳΔ
    w 'PVOEBUJPO࣮૷੾Γସ͑ͷӨڹ͸θϩ͡Όͳ͍ʂ
55. ϚεΫύλʔϯ 000 Ϟʔυࢦࣔࢠ (i × j) % 2 + (i × j) % 3 (͓·͚)
56. ϚεΫύλʔϯ 000 Ϟʔυࢦࣔࢠ (i × j) % 2 + (i × j) % 3 XOR = 0100 → 8ϏοτόΠτϞʔυͩʂ (͓·͚)