问改进TrueDepth传感器存储的深度数据图像

EN

    @IBAction func exportData(_ sender: Any) {
        let ciimage = CIImage(cvPixelBuffer: realDepthData.depthDataMap)
        
        let depthUIImage = UIImage(ciImage: ciimage)
        let data = depthUIImage.pngData()
        
        print("data: \(realDepthData.depthDataMap)")
        
        do {
            let directory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0];
            let path = directory.appendingPathComponent("FaceIdData.png");
            
            try data!.write(to: path)
            let activityViewController = UIActivityViewController(activityItems: [path], applicationActivities: nil)
            activityViewController.popoverPresentationController?.sourceView = exportMeshButton
            present(activityViewController, animated: true, completion: nil)
        } catch {
            print("Unable to save image")
        }
    }

   func dataOutputSynchronizer(_ synchronizer: AVCaptureDataOutputSynchronizer,
                                didOutput synchronizedDataCollection: AVCaptureSynchronizedDataCollection) {
        
        ...

        let depthData = syncedDepthData.depthData
        let depthPixelBuffer = depthData.depthDataMap
        
        self.realDepthData = depthData
        
        ...
    }