【iOS开发】相册选择图片识别条形码

原生识别条形码

VNDetectBarcodesRequest 只要iOS11.0+以上支持，支持iOS11.0-以下请使用其他方案

    // Create a barcode detection-request
    let barcodeRequest = VNDetectBarcodesRequest(completionHandler: { request, error in
        guard let results = request.results else { return }
        // Loopm through the found results
        for result in results {
            // Cast the result to a barcode-observation
            if let barcode = result as? VNBarcodeObservation {
                // Print barcode-values
                print("Symbology: \(barcode.symbology.rawValue)")
                // Print barcode string
                if let payload = barcode.payloadStringValue {
                    print("Payload: \(payload)")
                }
                if let desc = barcode.barcodeDescriptor as? CIQRCodeDescriptor {
                    let content = String(data: desc.errorCorrectedPayload, encoding: .utf8)
                    // FIXME: This currently returns nil. I did not find any docs on how to encode the data properly so far.
                    print("Payload: \(String(describing: content))")
                    print("Error-Correction-Level: \(desc.errorCorrectionLevel)")
                    print("Symbol-Version: \(desc.symbolVersion)")
                }
            }
        }
    })
    // 获取条形码
    func WM_FUNC_getInfoByImage() -> Void {
        let myImage = UIImage.init(named: "1631511918532.jpg");
        // Create an image handler and use the CGImage your UIImage instance.
        guard let image = myImage?.cgImage else { return }
        let handler = VNImageRequestHandler(cgImage: image, options: [:])
        // Perform the barcode-request. This will call the completion-handler of the barcode-request.
        guard let _ = try? handler.perform([barcodeRequest]) else {
            return print("Could not perform barcode-request!")
        }
    }

使用其他第三方来识别条形码

这里介绍两种第三方，ZXing和MLKit两种方式，当然，其他的第三方可以自己去尝试。

第一种、使用 ZXing 来识别图片的二维码

zxingify-objc - GitHub地址 可以去GitHub查看

1、使用pods集成

  pod 'ZXingObjC', '~> 3.6.4'

2、github有OC代码，这里只贴出swift 代码

    // 使用ZXing
    func WM_FUNC_barcode_zxing() -> Void {
        //自行更改图片传入
        if let inputImage = UIImage.init(named: "1631511918532.jpg"){
            let cgImage = inputImage.cgImage;
            let source = ZXCGImageLuminanceSource.init(cgImage: cgImage);
            let bitmap = ZXBinaryBitmap.init(binarizer: ZXHybridBinarizer.init(source: source))
            if let reader:ZXMultiFormatReader = ZXMultiFormatReader.reader() as? ZXMultiFormatReader {
                do {
                    let hints = ZXDecodeHints.hints();
                    let result = try reader.decode(bitmap,hints: hints as? ZXDecodeHints)
                    let contents = result.text
                    // The barcode format, such as a QR code or UPC-A
                    let format = result.barcodeFormat
                    print("contents == \(contents ?? "") format = \(format.rawValue)")
                    
                } catch let error as NSError {
                    print(error)
                }
            }else{
                print("ZXMultiFormatReader init error")
            }
        }else{
            print("inputImage init error")
        }

    }

第二种、使用 MLKit 来识别图片的二维码

谷歌官方地址文档GoogleMLKit之 barcode-scanning 需要梯子，请自备梯子。

1、使用pods集成

   pod 'GoogleMLKit/BarcodeScanning', '2.3.0'

2、github有OC和swift代码，这里只贴出swift 代码

    //条形码
    func WM_FUNC_barcode() -> Void {
        
        //自行更改图片传入
        if let inputImage = UIImage.init(named: "1631511918532.jpg"){
            let visionImage = VisionImage(image: inputImage)
            visionImage.orientation = inputImage.imageOrientation
            
            let barcodeScanner = BarcodeScanner.barcodeScanner()
            
            barcodeScanner.process(visionImage) { features, error in
              guard error == nil, let features = features, !features.isEmpty else {
                // Error handling
                return
              }
              // Recognized barcodes
                for barcode in features {
                    
                    print("barcode = " + (barcode.rawValue ?? ""))
//                  let corners = barcode.cornerPoints
//                  let displayValue = barcode.displayValue
//                  let rawValue = barcode.rawValue
//                  let valueType = barcode.valueType
//                  switch valueType {
//                  case .wiFi:
//                    let ssid = barcode.wifi?.ssid
//                    let password = barcode.wifi?.password
//                    let encryptionType = barcode.wifi?.type
//                  case .URL:
//                    let title = barcode.url!.title
//                    let url = barcode.url!.url
//                  default:
//                    // See API reference for all supported value types
//                    print(barcode.url)
//                    print("11223344");
//                  }
                }
            }
        }
    }