Generate QR Code for a string [Swift 4]

func generateQRcode(from string: String) -> UIImage? {

     

        let data = string.data(using: String.Encoding.ascii)

     

        if let filter = CIFilter(name: "CIQRCodeGenerator") {

            filter.setDefaults()

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

            let transform = CGAffineTransform(scaleX: 3, y: 3)

         

            if let output = filter.outputImage?.transformed(by: transform) {

                let context:CIContext = CIContext.init(options: nil)

                let cgImage:CGImage = context.createCGImage(output, from: output.extent)!

                let rawImage:UIImage = UIImage.init(cgImage: cgImage)

             

                let cgimage: CGImage = (rawImage.cgImage)!

                let cropZone = CGRect(x: 0, y: 0, width: Int(rawImage.size.width), height: Int(rawImage.size.height))

                let cWidth: size_t  = size_t(cropZone.size.width)

                let cHeight: size_t  = size_t(cropZone.size.height)

                let bitsPerComponent: size_t = cgimage.bitsPerComponent

             

                let bytesPerRow = (cgimage.bytesPerRow) / (cgimage.width  * cWidth)

             

                let context2: CGContext = CGContext(data: nil, width: cWidth, height: cHeight, bitsPerComponent: bitsPerComponent, bytesPerRow: bytesPerRow, space: CGColorSpaceCreateDeviceRGB(), bitmapInfo: cgimage.bitmapInfo.rawValue)!

             

                context2.draw(cgimage, in: cropZone)

             

                let result: CGImage  = context2.makeImage()!

                let finalImage = UIImage(cgImage: result)

             

                return finalImage

             

            }

        }

     

        return nil

    }

Usage:

// It will return an image

let image = generateBarcode(from: "Type_Your_String_Here")