Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value ( setupInputOutput)

Question

I am trying to add a camera function to my app, but these message keeps appearing on my screen and I can not fin a solution for it. ANY EXAMPLES TO REPLACE WITH?

   func setupInputOutput(){
    do {
        let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera!);captureSession.addInput(captureDeviceInput)
        photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format:[AVVideoCodecKey:  AVVideoCodecType.jpeg])], completionHandler: nil)

       } catch {print(error)

Do you run this in simulator ? – Sh_Khan Apr 16 '19 at 12:14 — Sh_Khan, Apr 16 '19 at 12:14
I think he problem is captureDeviceInput – Felix Persson Apr 16 '19 at 12:15 — Felix Persson, Apr 16 '19 at 12:15
yes @sh_khan that's when it crashes – Felix Persson Apr 16 '19 at 12:17 — Felix Persson, Apr 16 '19 at 12:17

score 0 · Answer 1 · answered Apr 16 '19 at 12:23

Simulator doesn't have a video input you need to run in a real device

func setupInputOutput() {  

   do { 
       guard let currentCamera = AVCaptureDevice.default(for: AVMediaType.video) else { return }
       let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera);captureSession.addInput(captureDeviceInput)
       photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format:[AVVideoCodecKey:  AVVideoCodecType.jpeg])], completionHandler: nil)

   } catch {    
     print(error)

   } 

}

Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value ( setupInputOutput)

1 Answers1