ios swift3.0实现二维码扫描、生成、识别示例代码

3.识别二维码

通过CIDetector识别二维码

CIDetector用于分析CIImage，以得到CIFeature，每个CIDetector都要用一个探测器类型（NSString）来初始化。这个类型用于告诉探测器要找什么特征

1.识别图片二维码

  func recognizeQRCode() -> String?
  {

    let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy : CIDetectorAccuracyHigh])
    let features = detector?.features(in: CoreImage.CIImage(cgImage: self.cgImage!))
    guard (features?.count)! > 0 else { return nil }
    let feature = features?.first as? CIQRCodeFeature
    return feature?.messageString

  }

DispatchQueue.global().async {
      let recognizeResult = self.sourceImage?.recognizeQRCode()
      let result = recognizeResult?.characters.count > 0 ? recognizeResult : "无法识别"
      DispatchQueue.main.async {
        Tool.confirm(title: "扫描结果", message: result, controller: self)
        self.activityIndicatoryView.stopAnimating()
      }
    }