QRコードの仕様ってn種類あんねん

2025.09.20 iOSDC Japan 2025

1. QRίʔυͷ࢓༷ͬͯnछྨ͋ΜͶΜ 2025.09.20 iOSDC Japan 2025 Ryomm / Ryoko Matsusaka
2. Ryomm / Ryoko Matsusaka ͦͷଞ: Ryomm : @__ryomm iOSΞϓϦΤϯδχϟ
3. QRίʔυ͸(ג)σϯιʔ΢Σʔϒͷొ࿥঎ඪͰ͢ QRίʔυΛੜ੒͍ͨ͠
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 QRίʔυʹؚΊΔσʔλ ޡΓగਖ਼Ϩϕϧ
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. QRίʔυͷ࢓༷ͬͯnछྨ͋ΜͶΜ
8. ࠷ۙͷMaaSք۾
9. ࠷ۙͷMaaSք۾
10. όʔδϣϯ
11. όʔδϣϯ 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
12. 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) }
13. 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) } όʔδϣϯࢦఆ Ͱ͖ͳ͘Ͷ…ʁ ʁ ͳΜ͔উखʹ ৭ΜͳόʔδϣϯͰ ੜ੒͞ΕͯΔ͠…
14. ͳΜ͔উखʹ ৭ΜͳόʔδϣϯͰ ੜ੒͞ΕͯΔ͠…
15. ͳΜ͔উखʹ ৭ΜͳόʔδϣϯͰ ੜ੒͞ΕͯΔ͠… ʂ
16. Data 1234123412 Data 123…………..234 ʂ
17. 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) }
18. 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) }
19. 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) } 0 0 0 0 0ຒΊͰ௕͞ௐ੔
20. 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) }
21. ଞʹ΋Կ͔΍ΕΔ ؾ͕͖ͯͨ͠ ʢ͔͜͜Βझຯʣ
22. ٖࣅϑϨʔϜ23
23. ޡΓగਖ਼Ϩϕϧ ϨϕϧL Low ໿7% ϨϕϧM Medium ໿15% ϨϕϧQ Quality) ໿25% ϨϕϧH High ໿30% ࢀߟ: https://www.qrcode.com/about/error_correction.html
24. ޡΓగਖ਼ ϔομʔ ύσΟϯά 1ίʔυϫʔυ8bit σʔλίʔυϫʔυ ޡΓగਖ਼ίʔυϫʔυ શίʔυϫʔυ
25. ޡΓగਖ਼ σʔλίʔυϫʔυ: 10 / గਖ਼ର৅: 5 ޡΓగਖ਼ίʔυϫʔυ: 52  10 గਖ਼͢Δίʔυϫʔυͷ2ഒ గਖ਼཰: 5 / 20  25% (ϨϕϧQ σʔλίʔυϫʔυ ޡΓగਖ਼ίʔυϫʔυ શίʔυϫʔυ
26. ޡΓగਖ਼ గਖ਼཰: గਖ਼Մೳ਺ / શίʔυϫʔυ਺ RSϒϩοΫ గਖ਼཰: 2 / 8  25% గਖ਼཰: 4 / 16  25%
27. ޡΓగਖ਼Ϩϕϧ ϨϕϧM ϨϕϧQ ϨϕϧL ϨϕϧH ࣮ࡍ͸ ͜ͷ͘Β͍͍͚Δ
28. func frameQRCode(data: Data?, image: UIImage) -" UIImage? { let transform = CGAffineTransform(scaleX: 10, y: 10) guard let data, let filter = CIFilter(name: “CIQRCodeGenerator”, parameters: ["inputMessage": data, "inputCorrectionLevel": "H"]), let ciImage = filter.outputImage?.transformed(by: transform) let cgImage = CIContext().createCGImage(ciImage, from: ciImage.extent) else { return nil } let qrImage = UIImage(cgImage: cgImage) return UIGraphicsImageRenderer(size: qrImage.size).image { context in let qrWidth = context.format.bounds.width let qrHeight = context.format.bounds.height let imageWidth = qrWidth / (dimension + 2) * imageDimension let imageHeight = qrHeight / (dimension + 2) * imageDimension ࢀߟ: https://dev.classmethod.jp/articles/swift-generate-qr-code/
29. let qrImage = UIImage(cgImage: cgImage) return UIGraphicsImageRenderer(size: qrImage.size).image { context in let qrWidth = context.format.bounds.width let qrHeight = context.format.bounds.height let imageWidth = qrWidth / (dimension + 2) * imageDimension let imageHeight = qrHeight / (dimension + 2) * imageDimension qrImage.draw(in: CGRect(origin: .zero, size: context.format.bounds.size)) let imageRect = CGRect(x: (qrWidth - imageWidth) / 2, y: (qrHeight - imageHeight) / 2, width: imageWidth, height: imageHeight) image.draw(in: imageRect) } } ࢀߟ: https://dev.classmethod.jp/articles/swift-generate-qr-code/
30. let qrImage = UIImage(cgImage: cgImage) return UIGraphicsImageRenderer(size: qrImage.size).image { context in let qrWidth = context.format.bounds.width let qrHeight = context.format.bounds.height let imageWidth = qrWidth / (dimension + 2) * imageDimension let imageHeight = qrHeight / (dimension + 2) * imageDimension qrImage.draw(in: CGRect(origin: .zero, size: context.format.bounds.size)) let imageRect = CGRect(x: (qrWidth - imageWidth) / 2, y: (qrHeight - imageHeight) / 2, width: imageWidth, height: imageHeight) image.draw(in: imageRect) } } ࢀߟ: https://dev.classmethod.jp/articles/swift-generate-qr-code/
31. ͜Ε͸Ͳ͜·Ͱ ΍ΕΔΜͩʙʂʁ
32. 0 0 1 1 ෼ׂ23ίʔυ ϔομʔ ύσΟϯά σʔλ Ϟʔυࢦࣔࢠ ;ͭ͏ͷQRίʔυ 3 ෼ׂQRίʔυ ෼ׂQRίʔυ ͜ΕԿ൪໨ʁ શ෦ͰԿݸʁ ϖʔδ൪߸ ࠷େϖʔδ൪߸ ࿈݁༻IDతͳѻ͍Λ͞Ε͕ͪ ࢀߟ: https://programresource.net/2013/05/04/2193.html ύϦςΟ(্Ґ) ύϦςΟ(ԼҐ)
33. ͋ʙͳΜ͔͜Ε… Ͱ͖ͳ͘΋ͳͦ͞͏…
34. ͋ʙͳΜ͔͜Ε… Ͱ͖ͳ͘΋ͳͦ͞͏… CIQRCodeGeneratorͰ Ͳ͏΍ͬͯϔομʔ৘ใ ͍͡ΔΜͩ…ʁ
35. Ͱ͖·ͤΜʂ
36. ࢀߟ: https://github.com/zxing-cpp/zxing-cpp  
37. Ϟʔυࢦࣔࢠ ਺ࣈ ӳ਺ه߸ 8bit ׽ࣈ
38. Ϟʔυࢦࣔࢠ ਺ࣈ ӳ਺ه߸ 8bit ׽ࣈ “nyan".data(using: .utf8) 1101110 1111001 1100001 1101110
39. Ϟʔυࢦࣔࢠ ਺ࣈ ӳ਺ه߸ 8bit ׽ࣈ “nyan".data(using: .utf8) 1101110 1111001 1100001 1101110 0001 0010 0100 1000     ϔομʔ
40. όʔδϣϯ 1101110 1111001 1100001 1101110 4byte ޡΓగਖ਼Ϩϕϧ: Q ΄ͳɺόʔδϣϯ1͔ʙ 2121ͷۭͷϚτϦοΫε     ϔομʔ σʔλίʔυϫʔυ
41.             σʔλͷେ͖͞     ϔομʔ 1101110 1111001 1100001 1101110 4byte σʔλ͸4byte෼ೖͬͯΔͷͶʂ σʔλίʔυϫʔυ 8bit
42. ऴ୺ύλʔϯ
    
    ύσΟϯάύλʔϯ ޡΓగਖ਼Ϩϕϧ: Q όʔδϣϯ: 1ɹ 13byteೖΓ·͢ͳʙ ϔομʔ৘ใ΋ؚΜͩ༰ྔ             ϔομʔ 1101110 1111001 1100001 1101110 σʔλίʔυϫʔυ
43. ऴ୺ύλʔϯ
    
    ύσΟϯάύλʔϯ             ϔομʔ 1101110 1111001 1100001 1101110 σʔλίʔυϫʔυ
44. ऴ୺ύλʔϯ
    
    ύσΟϯάύλʔϯ ϔομʔ σʔλίʔυϫʔυ 13byte 12bit 4byte σʔλ෦෼֨ೲՄೳ༰ྔ ऴ୺ύλʔϯ 0000 ͪΐ͏Ͳ8bitʹͳΔΑ͏0ຒΊ ύσΟϯάύλʔϯ 0xEC 0x11 0xEC 0x11 …
45. ޡΓగਖ਼ ϔομʔ σʔλίʔυϫʔυ ޡΓగਖ਼ίʔυϫʔυ
46. ϚεΫύλʔϯ 000 (x+y)%2='0 001 y%2='0 010 x%3='0 011 (x+y)%3='0 100 ((y/2)+(x/3)%2='0 101 (x*y)%6='0 110 (x*y)%6<3 111 (y+x+((y*x)%3))%2='0
47. ϚεΫύλʔϯ 000 (x+y)%2='0 001 y%2='0 010 x%3='0 011 (x+y)%3='0 100 ((y/2)+(x/3)%2='0 101 (x*y)%6='0 110 (x*y)%6<3 111 (y+x+((y*x)%3))%2='0
48. ϑΝΠϯμύλʔϯ
    
    ηύϨʔλ ϑΝΠϯμύλʔϯ Ґஔ΍ճసΛݕग़ ηύϨʔλ
49. ΞϥΠϝϯτύλʔϯ ΞϥΠϝϯτύλʔϯ ࿪ΈʹΑΔҐஔͣΕΛิਖ਼
50. λΠϛϯάύλʔϯ λΠϛϯάύλʔϯ Ϟδϡʔϧ࠲ඪΛݕग़
51. ϑΥʔϚοτ৘ใ ޡΓగਖ਼Ϩϕϧ ϚεΫύλʔϯ      2bit 3bit ޡΓగਖ਼ූ߸ʢBCHූ߸ʣ bchCode(formatInfo, poly: 0x537)
52. ϑΥʔϚοτ৘ใ ޡΓగਖ਼Ϩϕϧ ϚεΫύλʔϯ      2bit 3bit 10bit ޡΓగਖ਼ූ߸ formatBits ^ 0x5412
53. ϑΥʔϚοτ৘ใ
54. σʔλ৘ใ
55. ϚεΫύλʔϯ 000 (x+y)%2='0 001 y%2='0 010 x%3='0 011 (x+y)%3='0 100 ((y/2)+(x/3)%2='0 101 (x*y)%6='0 110 (x*y)%6<3 111 (y+x+((y*x)%3))%2='0
56. ϚεΫύλʔϯ 000 (x+y)%2='0 001 y%2='0 010 x%3='0 011 (x+y)%3='0 100 ((y/2)+(x/3)%2='0 101 (x*y)%6='0 110 (x*y)%6<3 111 (y+x+((y*x)%3))%2='0
57. ϚεΫύλʔϯ ಉ͡৭ͷϞδϡʔϧ͕࿈ଓ͢Δ͔5ݸҎ্) 22ͷಉ৭ϒϩοΫʹͳ͍ͬͯΔ͔ ϑΝΠϯμʔύλʔϯʹࣅ͍ͯΔ ໌҉Ϟδϡʔϧͷൺ཰
58. ͜Ε͸Ͳ͏΍ͬͯ ը૾ʹ͢Δ…ʁ