self/app/ios/Examples/Example_SPM/NFCPassportReaderApp/MrzScanner/PreviewView.swift

/*
See LICENSE folder for this sample’s licensing information.

Abstract:
Application preview view
*/

import UIKit
import AVFoundation

class PreviewView: UIView {
	var videoPreviewLayer: AVCaptureVideoPreviewLayer {
		guard let layer = layer as? AVCaptureVideoPreviewLayer else {
			fatalError("Expected `AVCaptureVideoPreviewLayer` type for layer. Check PreviewView.layerClass implementation.")
		}
		
		return layer
	}
	
	var session: AVCaptureSession? {
		get {
			return videoPreviewLayer.session
		}
		set {
			videoPreviewLayer.session = newValue
		}
	}
	
	// MARK: UIView
	
	override class var layerClass: AnyClass {
		return AVCaptureVideoPreviewLayer.self
	}
}