SwiftUI Custom Camera- Camera Preview keeps crashing - ios

Question

My goal is to build a custom camera for my app. At the moment, I'm just trying to get the live preview working, however for some reason my camera preview keeps crashing. I'm not exactly sure why the camera preview causes my app to crash. Is there a bug in SwiftUI I am unaware of? Here's the complete code below, the camera preview is at the bottom. Any little bit of help would be greatly appreciated. Thank you
import SwiftUI
import AVFoundation
struct LiveCamera: View {
var body: some View {
CameraView()
}
}
struct LiveCamera_Previews: PreviewProvider {
static var previews: some View {
LiveCamera()
}
}
struct CameraView: View {
#Environment(\.presentationMode) var presentationMode
#StateObject var camera = CameraModel()
var body: some View {
ZStack {
// Going to be the camera view
Color.black
.edgesIgnoringSafeArea(.all)
VStack {
// Dismiss button back to oringinal screen
Button(action: {
presentationMode.wrappedValue.dismiss()
}, label: {
Image(systemName: "multiply")
.font(.system(size: 40, weight: .semibold))
.foregroundColor(Color.white.opacity(0.9))
.shadow(color: Color.black.opacity(0.6), radius: 1, x: 0, y: 2)
})
.offset(x: 150)
Spacer()
// Botttom toolbar for Live camera view
HStack {
// switch camera button
Button(action: {
}, label: {
Image(systemName: "arrow.triangle.2.circlepath.camera")
.font(.largeTitle)
.foregroundColor(.white)
})
.padding(.leading)
Spacer()
// If taken showing Live buttons
if camera.isTaken {
Spacer()
// Stop live recording button
Button(action: {
camera.isTaken.toggle()
}, label: {
ZStack {
Circle()
.fill(Color.red)
.frame(width: 65, height: 65)
Circle()
.stroke(Color.white, lineWidth: 2)
.frame(width: 75, height: 75)
}
})
Spacer()
} else {
// start live recording button
Button(action: {
camera.isTaken.toggle()
}, label: {
ZStack {
Circle()
.fill(Color.white)
.frame(width: 65, height: 65)
Circle()
.stroke(Color.white, lineWidth: 2)
.frame(width: 75, height: 75)
}
})
}
Spacer()
// camera flash/ light button
Button(action: {
}, label: {
Image(systemName: "bolt.circle")
.font(.largeTitle)
.foregroundColor(.white)
})
.padding(.trailing)
}
.frame(height: 75)
}
}
.onAppear(perform: {
camera.check()
})
}
}
// Camera Model...
class CameraModel: ObservableObject {
#Published var isTaken = false
#Published var session = AVCaptureSession()
#Published var alert = false
// since were going to read pic data
#Published var output = AVCapturePhotoOutput()
// preview
#Published var preview : AVCaptureVideoPreviewLayer!
func check() {
// first checking camera got permission...
switch AVCaptureDevice.authorizationStatus(for: .video) {
case .authorized:
setUp()
return
// Setting up session
case .notDetermined:
// return for permission
AVCaptureDevice.requestAccess(for: .video) { (status) in
if status {
self.setUp()
}
}
case .denied:
self.alert.toggle()
return
default:
return
}
}
func setUp() {
// setting up camera
do {
// setting configuration
self.session.beginConfiguration()
// change for your own...
let device = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .front)
let input = try AVCaptureDeviceInput(device: device!)
// checking and adding to session
if self.session.canAddInput(input) {
self.session.addInput(input)
}
// same for output
if self.session.canAddOutput(self.output) {
self.session.addOutput(self.output)
}
self.session.commitConfiguration()
}
catch {
print(error.localizedDescription)
}
}
}
// setting view for preview
struct CameraPreview: UIViewRepresentable {
#ObservedObject var camera : CameraModel
func makeUIView(context: Context) -> UIView {
let view = UIView(frame: UIScreen.main.bounds)
camera.preview = AVCaptureVideoPreviewLayer(session: camera.session)
camera.preview.frame = view.frame
// Your own properties....
camera.preview.videoGravity = .resizeAspectFill
view.layer.addSublayer(camera.preview)
// start camera session
camera.session.startRunning()
return view
}
func updateUIView(_ uiView: UIView, context: Context) {
}
}