Preview

Preview.swift

var previewView = UIImageView()

// MARK: - Lifecycle

override func loadView() {
    super.loadView()

    view = sceneView

    // Create a session configuration
    let configuration = ARWorldTrackingConfiguration()

    // We want to receive the frames from the video
    sceneView.session.delegate = self

    // Run the session with the configuration
    sceneView.session.run(configuration)

    view.addSubview(previewView)

    previewView.translatesAutoresizingMaskIntoConstraints = false
    previewView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    previewView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
}