Start/Stop food detection

In viewWillAppear request authorization to use the camera and start the recognition:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    if AVCaptureDevice.authorizationStatus(for: .video) == .authorized {
        startFoodDetection()
    } else {
        AVCaptureDevice.requestAccess(for: .video) { (granted) in
            if granted {
                DispatchQueue.main.async {
                    self.startFoodDetection()
                }
            } else {
                print("The user didn't grant access to use camera")
            }
        }
    }
}

Add the method startFoodDetection()

func startFoodDetection() {
    setupPreviewLayer()
    passioSDK.startFoodDetection(foodRecognitionDelegate: self) { ready in
        if !ready {
            print("SDK was not configured correctly")
        }
    }
}

Add the method setupPreviewLayer:

 // MARK: PassioSDK: setup PreviewLayer
func setupPreviewLayer() {
    guard videoLayer == nil else { return }
    if let videoLayer = passioSDK.getPreviewLayer() {
        self.videoLayer = videoLayer
        videoLayer.frame = view.bounds
        view.layer.insertSublayer(videoLayer, at: 0)
    }
}

Stop Food Detection in viewWillDisappear:

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    passioSDK.stopFoodDetection()
    videoLayer?.removeFromSuperlayer()
    videoLayer = nil
}

If at any point you need help from the Passio team, please reach out to us at [e-mail]