ArkitExampleSetup.swift

class ViewController: UIViewController, ARSCNViewDelegate, ARSessionDelegate {
  
  @IBOutlet weak var sceneView: ARSCNView!
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }
  
  func run() {
    let configuration = ARWorldTrackingConfiguration()
    configuration.worldAlignment = .gravityAndHeading
    sceneView.session.delegate = self
    sceneView.session.run(configuration)
  }
}