in application/PhotoToSketch/PhotoToSketch/CameraScreen/CameraViewController.swift [112:120]
func cameraWithPosition(position: AVCaptureDevice.Position) -> AVCaptureDevice? {
let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: AVMediaType.video, position: .unspecified)
for device in discoverySession.devices {
if device.position == position {
return device
}
}
return nil
}