ios - 错误 : Type 'String!' has no member 'video'

Question

import UIKit
import AVKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

//start camera

        let captureSession = AVCaptureSession()

        guard let captureDevice =
           AVCaptureDevice.default(for: .video) else { return }
        guard let input = try? AVCaptureDeviceInput(device:
                captureDevice ) else { return }
        captureSession.addInput(input)

        captureSession.startRunning()
    }
}

我在 (for: .video) 的这一行中收到错误:

AVCaptureDevice.default(for: .video) else { return }

Answer 1

用 AVMediaTypeVideo 替换 AVMediaType.video 对我有用。