ARKit & CoreLocation + POI + AR Interaction

ar_poi_selection.swift

var sceneLocationView: SceneLocationView!
var pois: [PointOfInterest]!
var locationAnnotationNode2POI: [LocationTextAnnotationNode: PointOfInterest]!
var selectedPOI: PointOfInterest?

func setupARScene() {
    // create AR scene
    sceneLocationView = SceneLocationView()
    view.addSubview(sceneLocationView)

    // add tap gesture recognizer to AR scene's view
    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(handleARObjectTap(gestureRecognizer:)))
    sceneLocationView.addGestureRecognizer(tapGestureRecognizer)
}

@objc
func handleARObjectTap(gestureRecognizer: UITapGestureRecognizer) {
    guard gestureRecognizer.view != nil else { return }

    if gestureRecognizer.state == .ended {

        // Look for an object directly under the touch location
        let location: CGPoint = gestureRecognizer.location(in: sceneLocationView)
        let hits = sceneLocationView.hitTest(location, options: nil)
        if !hits.isEmpty {

            // select the first match
            if let tappedNode = hits.first?.node.parent as? LocationTextAnnotationNode {
                if let poi = locationAnnotationNode2POI?[tappedNode] {
                    self.selectedPOI = poi
                }
            }
        }
    }
}