如何使用 Swift 3 获取扫描的条码照片？

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，但我试图获取扫描结果并将其作为照片写入设备，但目前似乎不可能。

Answer 1

这样做的方法是使用CoreImage。当您获得readableObject.stringValue 时，您将使用过滤器CICode128BarcodeGenerator 生成图像。

所以，在你的例子中：

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!);
    }
}

记得在文件开头import CoreImage。