Created
September 30, 2018 11:31
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A function to generate a QR code from Data and then automatically scale it up to the targets size to remove blur
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| 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 | |
| } | |
| } |
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