Create QR code with Numeric encoding type

Question

I have long int number and I want to encode it to QRCode with exactly numeric type of encoding. Now I use CIFilter(name: "CIQRCodeGenerator"), but in this case I don't know how to choose type of encoding. Is there a way to create QR code with chosen type of encoding?

please check this url: https://stackoverflow.com/questions/48944184/swift-generate-a-qrcode/48945637#48945637 — aBilal17, Mar 21 '18 at 11:01

Jake · Answer 1 · 2018-03-21T11:14:52.703

The Apple documentation for CIQRCodeGenerator indicates that you should use NSISOLatin1StringEncoding (Objective-C) or String.Encoding.isoLatin1 (Swift) for encoding QR codes.

Here is a quick example for generating a UIImage from a given input integer in Swift 4.

enum QRInputEncoding: Int {
    case octal = 8
    case decimal = 10
    case hexadecimal = 16
}

func makeQRImage(input: Int, encoding: QRInputEncoding) -> UIImage? {
    let encoded = String(input, radix: encoding.rawValue)
    print(encoded)
    guard let data = encoded.data(using: .isoLatin1) else {
        return nil
    }
    let filter = CIFilter(name: "CIQRCodeGenerator", withInputParameters: ["inputMessage": data])
    return filter?.outputImage.map(UIImage.init(ciImage:))
}

makeQRImage(input: 100000, encoding: .octal) // prints 303240
makeQRImage(input: 100000, encoding: .decimal) // prints 100000
makeQRImage(input: 100000, encoding: .hexadecimal) // prints 186a0

This allows you to change the generated QR code output so that readers can read less characters in, resulting in a smaller QR code for the same number.

Now I do the same. But I am not sure what type of encoding use in this case, numeric or alphabetic or 8-bit. — FuzzzzyBoy, Mar 21 '18 at 10:48
I have edited my answer to allow customising the output encoding of the number passed in for your QR code. The previous example only output decimal numbers, now base 8 and 16 are options as well. — Jake, Mar 21 '18 at 11:18

score 0 · Answer 2 · answered Mar 21 '18 at 11:19

This will generate QRCode image and return

func makeQRImage(inputText: String) -> UIImage {  

            let data = inputText.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false)

            let filter = CIFilter(name: "CIQRCodeGenerator")

            filter.setValue(data, forKey: "inputMessage")
            filter.setValue("Q", forKey: "inputCorrectionLevel")

       return filter.outputImage
}

Anything else you can follow this code: https://github.com/appcoda/QR-Code-Generator

Also the tutorial : https://www.appcoda.com/qr-code-generator-tutorial

Create QR code with Numeric encoding type

2 Answers2