使用AVFoundation将相机添加到viewController

Question

我正在尝试将captureSession / camera添加到视图中。但无论我做什么，它都不会在docker-compose rm中显示任何内容。它只显示一个空白cameraView（UIView。我做错了什么？

变量

cameraView

viewDidLoad中

var captureSession = AVCaptureSession()
var backCamera: AVCaptureDevice?
var frontCamera: AVCaptureDevice?
var captureDevice: AVCaptureDevice?
let stillImageOutput = AVCaptureStillImageOutput()
var previewLayer : AVCaptureVideoPreviewLayer?
let videoOutput = AVCaptureMovieFileOutput()
let devices = AVCaptureDevice.devices()
var cameraView: UIView!

beginSession

setupCamera()

if backCamera != nil {
    beginSession(backCamera!)
}


cameraView = UIView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height))
cameraView.backgroundColor = UIColor.redColor()
self.view.addSubview(cameraView)


**setupCamera**

func setupCamera() {
    captureSession.sessionPreset = AVCaptureSessionPresetHigh

    // Loop through all the capture devices on this phone
    for device in devices {
        // Make sure this particular device supports video
        if device.hasMediaType(AVMediaTypeVideo) {
            // Finally check the position and confirm we've got the back camera
            if device.position == AVCaptureDevicePosition.Back {
                backCamera = device as? AVCaptureDevice
            }
            if device.position == AVCaptureDevicePosition.Front {
                frontCamera = device as? AVCaptureDevice
            }
        }
        if device.hasMediaType(AVMediaTypeAudio) {
            print(device)
        }
    }
}