向QR码添加多个键值对

我正在我的应用程序中创建QR码，我想知道是否可以添加第二个键值对。 现在我有一个12位数的“inputMessage”键，我想要另一个键的其他数据。 例如，使用另一个字符串作为名为“gym”的新键。

这是我创建QR码的function：

func generateCode() { let gymData = gymName.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false) let codeNumberData = generateRandomNumber(12).dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false) let filter = CIFilter(name: "CIQRCodeGenerator") filter?.setValue(codeNumberData, forKey: "inputMessage") // filter?.setValue(gymData, forKey: "gym") filter?.setValue("Q", forKey: "inputCorrectionLevel") let qrCodeImage = filter?.outputImage let context = CIContext(options: nil) let cgImage = context.createCGImage(qrCodeImage!, fromRect: (qrCodeImage?.extent)!) let image = UIImage(CGImage: cgImage, scale: 1.0, orientation: .Up) let resized = resizeImage(image, withQuality: CGInterpolationQuality.None, rate: 5.0) codeImageView.image = resized } 

Answer 1

CIFilter只期望从inputMessage生成QR代码，因此您需要创建单个聚合inputMessage并将其传递给filter。 一种相当直接的方法是从输入创建一个Dictionary，使用NSKeyedArchiver将其序列化为NSData blob，然后将结果设置为inputMessage 。

 func generateCode() { var aggregateData = [String: NSData]() if let gymData = gymName.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false) { aggregateData.updateValue(gymData, forKey: "gymData") } if let codeNumberData = generateRandomNumber(12).dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false) { aggregateData.updateValue(codeNumberData, forKey: "codeNumberData") } let archived = NSKeyedArchiver.archivedDataWithRootObject(aggregateData) let filter = CIFilter(name: "CIQRCodeGenerator") filter?.setValue(archived, forKey: "inputMessage") filter?.setValue("Q", forKey: "inputCorrectionLevel") let qrCodeImage = filter?.outputImage let context = CIContext(options: nil) let cgImage = context.createCGImage(qrCodeImage!, fromRect: (qrCodeImage?.extent)!) let image = UIImage(CGImage: cgImage, scale: 1.0, orientation: .Up) let resized = resizeImage(image, withQuality: CGInterpolationQuality.None, rate: 5.0) codeImageView.image = resized } 

当然，这意味着在接收端，您需要期望有效负载是字典，并通过其密钥访问各个组件。 应该看起来像这样。

 guard let inputData = scannedQrString.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false), dictionary = NSKeyedUnarchiver.unarchiveObjectWithData(inputData) as? [String: NSData] else { return } let gymData = dictionary["gymData"] let codeNumberData = dictionary["codeNumberData"]