FreePascal：如何创建对象列表

Question

所以我有以下代码，我想创建一个保存在类TRoom中的不同食物的列表。

import UIKit
import AVFoundation

@available(iOS 10.0, *)
class ScanViewController: UIViewController {

    var captureSession = AVCaptureSession?.self
    var videoPreviewLayer: AVCaptureVideoPreviewLayer?

    @IBOutlet weak var previewView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Get the back-facing camera for capturing videos
        //***ERROR OCCURRS ON THIS LINE***
        let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: AVMediaType.video, position: .back)

        guard let captureDevice = deviceDiscoverySession.devices.first else {
            print("Failed to get the camera device")
            return
        }

实施例： 睡觉：TRoom
在“睡觉”中，苹果和香蕉都是物体。

感谢您的帮助 Nuraxx