This is a sample code to generate a QR code from a character string or URL.
Reference:
CIImageをData型に変換したときにハマった時の対処法(Swift3.0)
SwiftでQRコードを生成してみた
The generated QR code is here.
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| import UIKit | |
| class ViewController: UIViewController { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| //文字列をNSDataに変換し、QRコードを作成します。 | |
| //Converts a string to NSData. | |
| let str = "カビゴン可愛い、大好き" | |
| let data = str.data(using: String.Encoding.utf8)! | |
| //URLをNSDataに変換し、QRコードを作成します。 | |
| //Converts a url to NSData. | |
| //let url = "http://swiswiswift.com" | |
| //let data = url.data(using: String.Encoding.utf8)! | |
| //QRコードを生成します。 | |
| //Generate QR code. | |
| let qr = CIFilter(name: "CIQRCodeGenerator", withInputParameters: ["inputMessage": data, "inputCorrectionLevel": "M"])! | |
| let sizeTransform = CGAffineTransform(scaleX: 10, y: 10) | |
| let qrImage = qr.outputImage!.transformed(by: sizeTransform) | |
| let context = CIContext() | |
| let cgImage = context.createCGImage(qrImage, from: qrImage.extent) | |
| let uiImage = UIImage(cgImage: cgImage!) | |
| //作成したQRコードを表示します | |
| //Display QR code | |
| let qrImageView = UIImageView() | |
| qrImageView.contentMode = .scaleAspectFit | |
| qrImageView.frame = self.view.frame | |
| qrImageView.image = uiImage | |
| self.view.addSubview(qrImageView) | |
| } | |
| } |