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Generate high resolution QR Code in swift
static func generateQRCode(from string: String, imageView: UIImageView) -> UIImage? {
let data = String.Encoding.ascii)
if let filter = CIFilter(name: "CIQRCodeGenerator") {
filter.setValue(data, forKey: "inputMessage")
// L: 7%, M: 15%, Q: 25%, H: 30%
filter.setValue("M", forKey: "inputCorrectionLevel")
if let qrImage = filter.outputImage {
let scaleX = imageView.frame.size.width / qrImage.extent.size.width
let scaleY = imageView.frame.size.height / qrImage.extent.size.height
let transform = CGAffineTransform(scaleX: scaleX, y: scaleY)
let output = qrImage.transformed(by: transform)
return UIImage(ciImage: output)
return nil
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