A function to generate a QR code from Data and then automatically scale it up to the targets size to remove blur

QRGenerator.swift

func generateQRCode(from data: Data) -> UIImage? {
	if let filter = CIFilter(name: "CIQRCodeGenerator") {
		filter.setValue(data, forKey: "inputMessage")

		guard let qrCodeImage = filter.outputImage else { return nil }
            
		let scaleX = self.codeView.frame.size.width / qrCodeImage.extent.size.width
		let scaleY = self.codeView.frame.size.height / qrCodeImage.extent.size.height
		let transform = CGAffineTransform(scaleX: scaleX, y: scaleY)
		
		if let output = filter.outputImage?.transformed(by: transform) {
			return UIImage(ciImage: output)
		} else {
			return nil
		}
	} else {
		return nil
	}
}