VisionContentView.swift

import SwiftUI
import AVFoundation.AVCaptureSession

struct ContentView: View {
    @ObservedObject var data = DataModel.shared
    var body: some View {
        ZStack {
            CameraFeedView(view: data.previewView,
                           session: data.session)
            .frame(maxWidth: .infinity, maxHeight: .infinity)
            DebugOverlayView(text: data.debugString)
        }
    }
}

extension ContentView {
    private struct DebugOverlayView: View {
        let text: String
        var body: some View {
            Group {
                ZStack {
                    Rectangle()
                        .foregroundColor(.white)
                    Text(text)
                        .foregroundColor(.black)
                        .frame(maxWidth: .infinity,
                               maxHeight: .infinity,
                               alignment: .topLeading)
                        .font(.title)
                        .padding(15)
                }
                .frame(height: 200)
                .cornerRadius(20)
            }
            .frame(maxWidth: .infinity,
                   maxHeight: .infinity,
                   alignment: .bottom)
        }
    }
    
    private struct CameraFeedView: UIViewRepresentable {
        let view: UIView
        let session: AVCaptureSession
        
        func makeUIView(context: Context) -> UIView {
            return view
        }
        
        func updateUIView(_ uiView: UIView, context: Context) {
            if view.bounds != .zero {
                DispatchQueue.main.async {
                    AVCaptureVideoPreviewLayer
                        .createAsSublayer(of: view, session: session)
                }
            }
        }
    }
}