使用iOS 11无法在iPhone 7+上捕获深度

Question

我正在使用安装了ios 11的iPhone 7+，我正在尝试调整一些捕获常规图像的代码以捕捉深度。

当我致电capturePhotoOutput?.isDepthDataDeliverySupported时，它会返回false。我的印象是，我可以使用我的iPhone 7+来捕捉深度。

我是否错过了info.plist的许可？或者我犯了一个更基本的错误？

//
//  RecorderViewController.swift


import UIKit
import AVFoundation


class RecorderViewController: UIViewController {

    @IBOutlet weak var previewView: UIView!

    @IBAction func onTapTakePhoto(_ sender: Any) {
        // Make sure capturePhotoOutput is valid
        guard let capturePhotoOutput = self.capturePhotoOutput else { return }
        // Get an instance of AVCapturePhotoSettings class
        let photoSettings = AVCapturePhotoSettings()
        // Set photo settings for our need
        photoSettings.isAutoStillImageStabilizationEnabled = true
        photoSettings.isHighResolutionPhotoEnabled = true
        photoSettings.flashMode = .auto
        // Call capturePhoto method by passing our photo settings and a
        // delegate implementing AVCapturePhotoCaptureDelegate
        capturePhotoOutput.capturePhoto(with: photoSettings, delegate: self)

    }

    var captureSession: AVCaptureSession?
    var videoPreviewLayer: AVCaptureVideoPreviewLayer?

    var capturePhotoOutput: AVCapturePhotoOutput?


    override func viewDidLoad() {
        super.viewDidLoad()

        //let captureDevice = AVCaptureDevice.default(for: AVMediaType.video)
        let captureDevice = AVCaptureDevice.default(AVCaptureDevice.DeviceType.builtInDualCamera, for: .video, position: .back)
        do {
            let input = try AVCaptureDeviceInput(device: captureDevice!)

            captureSession = AVCaptureSession()
            captureSession?.addInput(input)

            videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession!)
            videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
            videoPreviewLayer?.frame = view.layer.bounds
            previewView.layer.addSublayer(videoPreviewLayer!)

            capturePhotoOutput = AVCapturePhotoOutput()
            capturePhotoOutput?.isHighResolutionCaptureEnabled = true

            if (capturePhotoOutput?.isDepthDataDeliverySupported)!
            {
                capturePhotoOutput?.isDepthDataDeliveryEnabled = true
            }
            else{
                print ("DEPTH NOT SUPPORTED!")
            }



            // Set the output on the capture session
            captureSession?.addOutput(capturePhotoOutput!)

            captureSession?.startRunning()

        } catch {
            print(error)
        }




    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

extension RecorderViewController : AVCapturePhotoCaptureDelegate {
    func photoOutput(_ captureOutput: AVCapturePhotoOutput,
                     didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?,
                     previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?,
                 resolvedSettings: AVCaptureResolvedPhotoSettings,
                 bracketSettings: AVCaptureBracketedStillImageSettings?,
                 error: Error?) {
        // get captured image
        // Make sure we get some photo sample buffer
        guard error == nil,
            let photoSampleBuffer = photoSampleBuffer else {
                print("Error capturing photo: \(String(describing: error))")
                return
        }
        // Convert photo same buffer to a jpeg image data by using // AVCapturePhotoOutput
        guard let imageData =
            AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: photoSampleBuffer, previewPhotoSampleBuffer: previewPhotoSampleBuffer) else {
                return
        }
        // Initialise a UIImage with our image data
        let capturedImage = UIImage.init(data: imageData , scale: 1.0)
        if let image = capturedImage {
            // Save our captured image to photos album
            UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
        }
}
}