CamperaPreview SwiftUI view.

CameraPreview.swift

import AVFoundation

struct CameraPreview: UIViewRepresentable {
    // 1.
    class VideoPreviewView: UIView {
        override class var layerClass: AnyClass {
             AVCaptureVideoPreviewLayer.self
        }
        
        var videoPreviewLayer: AVCaptureVideoPreviewLayer {
            return layer as! AVCaptureVideoPreviewLayer
        }
    }
    
    // 2.
    let session: AVCaptureSession
    
    // 3.
    func makeUIView(context: Context) -> VideoPreviewView {
        let view = VideoPreviewView()
        view.backgroundColor = .black
        view.videoPreviewLayer.cornerRadius = 0
        view.videoPreviewLayer.session = session
        view.videoPreviewLayer.connection?.videoOrientation = .portrait

        return view
    }
    
    func updateUIView(_ uiView: VideoPreviewView, context: Context) {
        
    }
}