是否可以在UINavigationController前显示摄像机视图

import AVFoundation

let captureSession = AVCaptureSession()

guard let videoDevice = AVCaptureDevice.default(for: .video) else {
    // 摄像头不可用的处理逻辑
    return
}

guard let videoInput = try? AVCaptureDeviceInput(device: videoDevice) else {
    // 创建输入设备失败的处理逻辑
    return
}

if captureSession.canAddInput(videoInput) {
    captureSession.addInput(videoInput)
} else {
    // 添加输入设备失败的处理逻辑
    return
}

let videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
videoPreviewLayer.videoGravity = .resizeAspectFill
videoPreviewLayer.frame = view.layer.bounds

view.layer.insertSublayer(videoPreviewLayer, at: 0)

captureSession.startRunning()