AVCaptureSession not visible when using Sheet Dialog - swift

Question

I have a custom view in a storyboard with a ViewController to show me the output of a AVCaptureSessionPreviewLayer (in this case, webcam footage). When using a custom view in my normal window, all is fine and I see video output.
But when I want to use a custom view in a sheet dialog, the video is not visible even though the webcam indicates that is running.
Here is the ViewController code:
import Cocoa
import AVKit
class RecordViewController: NSViewController {
let captureSession = AVCaptureSession()
var captureDevice : AVCaptureDevice?
var previewLayer : AVCaptureVideoPreviewLayer?
#IBOutlet weak var camera: NSView!
override func viewDidLoad() {
super.viewDidLoad()
camera.wantsLayer = true;
camera.layer = CALayer()
// Do any additional setup after loading the view, typically from a nib.
captureSession.sessionPreset = AVCaptureSession.Preset.medium
// Get all audio and video devices on this machine
let devices = AVCaptureDevice.devices()
// Find the FaceTime HD camera object
for device in devices {
print(device)
// Camera object found and assign it to captureDevice
if ((device as AnyObject).hasMediaType(AVMediaType.video)) {
print(device)
captureDevice = device as? AVCaptureDevice
}
}
if captureDevice != nil {
do {
try captureSession.addInput(AVCaptureDeviceInput(device: captureDevice!))
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.frame = (self.camera.layer?.frame)!
// Add previewLayer into custom view
self.camera.layer?.addSublayer(previewLayer!)
// Start camera
captureSession.startRunning()
} catch {
print(AVCaptureSessionErrorKey.description)
}
} }
}

Answer 1

Change the line:
previewLayer?.frame = (self.camera.layer?.frame)!
to:
previewLayer?.frame = self.camera.bounds
And if you want to make your camera fill your customView use this line too:
previewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill