ios - 如何使用 Swift 3 获取扫描的条形码照片？

Question

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
    captureSession.stopRunning()

    if let metadataObject = metadataObjects.first {
        let readableObject = metadataObject as! AVMetadataMachineReadableCodeObject;

        AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
        found(code: readableObject.stringValue!);
    }
}

上述功能完美运行，但我尝试获取扫描结果并将其作为照片写入设备中，但目前似乎不可能。

Answer 1

实现这一点的方法是使用CoreImage。当您获取 readableObject.stringValue 时，您可以使用过滤器 CICode128BarcodeGenerator 生成图像。

因此，在您的示例中:

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!) {
    captureSession.stopRunning()

    if let metadataObject = metadataObjects.first {
        let readableObject = metadataObject as! AVMetadataMachineReadableCodeObject;

        let barcodeFilter = CIFilter(name: "CICode128BarcodeGenerator")
        barcodeFilter?.setValue(readableObject.stringValue!.data(using: .ascii), forKey: "inputMessage")

        let image = UIImage(ciImage: (barcodeFilter?.outputImage)!)

        AudioServicesPlaySystemSound(SystemSoundID(kSystemSoundID_Vibrate))
        found(code: readableObject.stringValue!);
    }
}

记住在文件开头导入CoreImage。