Making a Custom Camera, getting a " Thread 1: signal SIGBRT" ERROR in my App Delegate - ios

Question

I'm making a custom camera. I have 2 view controllers for the camera (one for the actual capture and another for a photo preview). Here is the code in each, I have reviewed it but don't find anything wrong! My XCODE project is a single view with CoreData enabled. EDIT: I have already added the appropriate Info.Plist camera permisions.
Below is my ViewController for taking the photo:
import UIKit
import AVFoundation
class ViewController: UIViewController {
var captureSession = AVCaptureSession()
var backCamera: AVCaptureDevice?
var frontCamera: AVCaptureDevice?
var currentCamera: AVCaptureDevice?
var photoOutput: AVCapturePhotoOutput?
var cameraPreviewlayer: AVCaptureVideoPreviewLayer?
var image: UIImage?
override func viewDidLoad() {
super.viewDidLoad()
setupCaptureSession()
setupDevice()
setupInputOutput()
setupPreviewLayer()
startRunningCaptureSession()
// Do any additional setup after loading the view, typically from a nib.
}
func setupCaptureSession() {
captureSession.sessionPreset = AVCaptureSession.Preset.photo
}
func setupDevice() {
let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)
let devices = deviceDiscoverySession.devices
for device in devices {
if device.position == AVCaptureDevice.Position.back {
backCamera = device
} else if device.position == AVCaptureDevice.Position.front {
frontCamera = device
}
}
currentCamera = backCamera
}
func setupInputOutput() {
do {
let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera!)
captureSession.addInput(captureDeviceInput)
photoOutput = AVCapturePhotoOutput()
photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil)
captureSession.addOutput(photoOutput!)
} catch {
print(error)
}
}
func setupPreviewLayer(){
cameraPreviewlayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewlayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewlayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewlayer?.frame = self.view.frame
self.view.layer.insertSublayer(cameraPreviewlayer!, at: 0)
}
func startRunningCaptureSession() {
captureSession.startRunning()
}
#IBAction func CameraButton_TouchUpInside(_ sender: Any) {
let settings = AVCapturePhotoSettings()
photoOutput?.capturePhoto(with: settings, delegate: self)
// performSegue(withIdentifier: "showPhoto_Segue", sender: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showPhoto_Segue" {
let previewVC = segue.destination as! PreviewViewController
previewVC.image = self.image
}
}
override var prefersStatusBarHidden: Bool {
return true
}
}
extension ViewController: AVCapturePhotoCaptureDelegate{
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation() {
print(imageData)
image = UIImage(data: imageData)
performSegue(withIdentifier: "showPhoto_Segue", sender: nil)
}
}
}
This is the code for my Preview where my error occurs when I press the Cancel or Save button for the capture the user just took:
import UIKit
class PreviewViewController: UIViewController {
#IBOutlet weak var photo: UIImageView!
var image: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
photo.image = self.image
}
#IBAction func cancelButton_TouchUpInside(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
#IBAction func saveButton_TouchUpInside(_ sender: Any) {
}
override var prefersStatusBarHidden: Bool {
return true
}
}
I have not changed or added any code inside the AppDelegate. This is in XCODE 9 and Swift 4. Thank you for your help.

Answer 1

your code is fine, you just forgot to ask permission for the camera use in the info.plist file, add this "Privacy - Camera Usage Description"

Answer 2

If you already updated .plist file you should check Camera Usage Permission.
func checkPermissions() {
let authStatus = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)
switch authStatus {
case .authorized:
setupCamera()
case .denied:
alertPromptToAllowCameraAccessViaSetting()
default:
// Not determined fill fall here - after first use, when is't neither authorized, nor denied
// we try to use camera, because system will ask itself for camera permissions
setupCamera()
}
}
func alertPromptToAllowCameraAccessViaSetting() {
let alert = UIAlertController(title: "Error", message: "Camera access required to...", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Cancel", style: .default))
alert.addAction(UIAlertAction(title: "Settings", style: .cancel) { (alert) -> Void in
UIApplication.shared.openURL(URL(string: UIApplicationOpenSettingsURLString)!)
})
present(alert, animated: true)
}