Flash with SwiftUI/AV Foundation Error code -16800 - swiftui

Question

I am trying to use flash when taking an image using AV Foundation in Swift UI. However, when I try to take a picture, I get the following error code.
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo={NSUnderlyingError=0x28004e790 {Error Domain=NSOSStatusErrorDomain Code=-16800 "(null)"}, NSLocalizedFailureReason=An unknown error occurred (-16800), AVErrorRecordingFailureDomainKey=4, NSLocalizedDescription=The operation could not be completed}
Below is the code that I am using for my camera that is generating this issue. I have gone through and commented some areas that I thought might be the source of the issue as I was trying to figure this out, but I may be wrong.
import SwiftUI
import AVFoundation
struct Camera: View {
var body: some View {
CameraView()
}
}
struct Camera_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
// Test code: Ignore
struct globalVariable {
public var isBack = false
}
class GlobalModel : ObservableObject {
#Published var isBack = false
func get() -> Bool{
return isBack
}
func setTrue() {
isBack = true
}
func setFalse() {
isBack = false
}
}
//
struct CameraView: View { // Creates the camera preview elements
#StateObject var camera = CameraModel()
#State var img : UIImage? = nil
#State var navigated = false
#ObservedObject var nextScreen = GlobalModel()
var body: some View{
ZStack{
CameraPreview(camera: camera)
.ignoresSafeArea(.all, edges: .all)
VStack{
Spacer()
HStack{
if camera.isTaken {
Button(action: {
camera.reTake()
self.nextScreen.setFalse()
print(nextScreen.get())
}, label: {
Text("Retake").foregroundColor(.black)
.fontWeight(.semibold)
.padding(.vertical, 10)
.padding(.horizontal, 30)
.background(Color.white)
.clipShape(Capsule())
}).padding(.trailing)
Spacer()
ZStack{
NavigationLink("", destination: Classify(originalImage: img, label: "", confidence: 0.0), isActive: $navigated)
Button(action:
{if !camera.isLoaded{
img = camera.savePic()
if img != nil{
print("is not nil")
}
self.navigated.toggle()
self.nextScreen.setTrue()
print(nextScreen.get())
}
}, label: {
Text("Continue").foregroundColor(.black)
.fontWeight(.semibold)
.padding(.vertical, 10)
.padding(.horizontal, 30)
.background(Color.white)
.clipShape(Capsule())
}).padding(.leading).opacity(nextScreen.get() ? 0.01 : 1)
}
}
else{
Button(action: camera.takePic, label: {
ZStack{
Image(systemName: "camera.circle")
.frame(width: 70, height: 75).font(.system(size: 60))
}
})
}
}.frame(height: 75)
}
}.onAppear(perform: {
UIDevice.current.setValue(UIInterfaceOrientation.portrait.rawValue, forKey: "orientation") // Forcing the rotation to portrait
AppDelegate.orientationLock = .portrait // And making sure it stays that way
//UITabBar.appearance().isHidden = true
camera.Check()
})
.onDisappear(){
AppDelegate.orientationLock = .all
UITabBar.appearance().isHidden = false
}
}
}
class CameraModel: NSObject, ObservableObject, AVCapturePhotoCaptureDelegate {
#Published var isTaken = false
#Published var session = AVCaptureSession()
#Published var alert = false
#Published var output = AVCapturePhotoOutput()
#Published var preview : AVCaptureVideoPreviewLayer!
#Published var isLoaded = false
#Published var picData = Data(count: 0)
var flashMode: AVCaptureDevice.FlashMode = .on // set the camera to on
var device : AVCaptureDevice? // for camera device
private func getSettings(camera: AVCaptureDevice, flashMode: AVCaptureDevice.FlashMode) -> AVCapturePhotoSettings {
let settings = AVCapturePhotoSettings() // get the default settings
and change them to enable flash
if camera.hasFlash {
settings.flashMode = self.flashMode
}
return settings
}
func Check() {
switch AVCaptureDevice.authorizationStatus(for: .video){
case .authorized:
setUp()
return
case .notDetermined:
AVCaptureDevice.requestAccess(for: .video) { (status) in
if status{
self.setUp()
}
}
case .denied:
self.alert.toggle()
return
default:
return
}
}
func setUp(){
do{
self.session.beginConfiguration()
self.device = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back)
let input = try AVCaptureDeviceInput(device: self.device!)
if self.session.canAddInput(input){
self.session.addInput(input)
}
if self.session.canAddOutput(self.output){
self.session.addOutput(self.output)
}
self.session.commitConfiguration()
}
catch{
print(error.localizedDescription)
}
}
func takePic(){
DispatchQueue.global(qos: .background).async {
let currentSettings = self.getSettings(camera: self.device!, flashMode: self.flashMode)
self.output.capturePhoto(with: currentSettings, delegate: self) // Capture photo with flash settings; doesn't work
DispatchQueue.main.async {
Timer.scheduledTimer(withTimeInterval: 0.1, repeats: false){
(timer) in self.session.stopRunning()
//isBack.setTrue()
}
}
}
DispatchQueue.main.async {
withAnimation{
self.isTaken.toggle()
}
}
}
func reTake() {
DispatchQueue.global(qos: .background).async {
self.session.startRunning()
DispatchQueue.main.async {
withAnimation{
self.isTaken.toggle()
self.isLoaded = false
}
}
}
}
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) // not sure if there is something wrong here that is messing up the program but need this function to work ultimately{
if error != nil{
print(error!)
}
print("photoOuput function")
print(photo)
guard let imageData = photo.fileDataRepresentation() else{return }
self.picData = imageData
}
func savePic () -> UIImage{
let image = UIImage(data: self.picData)!
self.isLoaded = true
return image
}
}
struct CameraPreview: UIViewRepresentable {
#ObservedObject var camera : CameraModel
func makeUIView(context: Context) -> some UIView {
let view = UIView(frame: UIScreen.main.bounds)
camera.preview = AVCaptureVideoPreviewLayer(session: camera.session)
camera.preview.frame = view.frame
camera.preview.videoGravity = .resizeAspectFill
view.layer.addSublayer(camera.preview)
camera.session.startRunning()
return view
}
func updateUIView(_ uiView: UIViewType, context: Context) {
}
}
I noticed that if I set the following line from above
var flashMode: AVCaptureDevice.FlashMode = .on
to
var flashMode: AVCaptureDevice.FlashMode = .off
the app doesn't produce the above error (but flash stays off). I am asking this because I need to save the output of the camera (with flash) as an image, however, with flash enabled, the picData is nil which leads to an unwrapping error (see the savePic() and photoOutput() functions for reference). Ultimately, I need the savePic() function to work
Any help with this will be appreciated.