AVFoundation take picture every second SWIFT - ios

Question

I'm trying to use AVFoundation framework to take a picture and analyze it in my app. I want it to take a picture every second automatically, how do I do that?
Here is my current code, right now it takes a picture only when call capturePhoto().
func setupSession() {
session = AVCaptureSession()
session.sessionPreset = AVCaptureSessionPresetPhoto
let camera = AVCaptureDevice
.defaultDeviceWithMediaType(AVMediaTypeVideo)
do { input = try AVCaptureDeviceInput(device: camera) } catch { return }
output = AVCaptureStillImageOutput()
output.outputSettings = [ AVVideoCodecKey: AVVideoCodecJPEG ]
guard session.canAddInput(input)
&& session.canAddOutput(output) else { return }
session.addInput(input)
session.addOutput(output)
previewLayer = AVCaptureVideoPreviewLayer(session: session)
previewLayer!.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer!.connection?.videoOrientation = .Portrait
view.layer.addSublayer(previewLayer!)
session.startRunning()
}
func capturePhoto() {
guard let connection = output.connectionWithMediaType(AVMediaTypeVideo) else { return }
connection.videoOrientation = .Portrait
output.captureStillImageAsynchronouslyFromConnection(connection) { (sampleBuffer, error) in
guard sampleBuffer != nil && error == nil else { return }
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
guard let image = UIImage(data: imageData) else { return }
//do stuff with image
}
}
What should I change?

Answer 1

So create an NSTimer that fires once a second, and in that NSTimer's method call capturePhoto:
Create a timer that fires once a second:
var cameraTimer = NSTimer.scheduledTimerWithTimeInterval(1.0,
target: self,
#selector(timerCalled(_:)),
userInfo: nil,
repeats: true)
Your timerCalled function might look like this:
func timerCalled(timer: NSTimer) {
capturePhoto()
}