ViewController.swift

import UIKit
import SpriteKit
import ARKit

struct ImageInformation {
    let name: String
    let description: String
    let image: UIImage
}

class ViewController: UIViewController, ARSKViewDelegate {
    @IBOutlet var sceneView: ARSKView!
    var selectedImage : ImageInformation?
    
    let images = ["monalisa" : ImageInformation(name: "Mona Lisa", description: "The Mona Lisa is a half-length portrait painting by the Italian Renaissance artist Leonardo da Vinci that has been described as 'the best known, the most visited, the most written about, the most sung about, the most parodied work of art in the world'.", image: UIImage(named: "monalisa")!)]
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        sceneView.delegate = self
        sceneView.showsFPS = true
        sceneView.showsNodeCount = true
        
        if let scene = SKScene(fileNamed: "Scene") {
            sceneView.presentScene(scene)
        }
        
        guard let referenceImages = ARReferenceImage.referenceImages(inGroupNamed: "Mona Lisa Room", bundle: nil) else {
            fatalError("Missing expected asset catalog resources.")
        }
        
        let configuration = ARWorldTrackingConfiguration()
        configuration.detectionImages = referenceImages
        
        sceneView.session.run(configuration, options: [.resetTracking, .removeExistingAnchors])
    }
    
    
    // MARK: - ARSKViewDelegate
    func view(_ view: ARSKView, nodeFor anchor: ARAnchor) -> SKNode? {
        
        if let imageAnchor = anchor as? ARImageAnchor,
            let referenceImageName = imageAnchor.referenceImage.name,
            let scannedImage =  self.images[referenceImageName] {
            
            self.selectedImage = scannedImage
            
            self.performSegue(withIdentifier: "showImageInformation", sender: self)
            
            return imageSeenMarker()
        }
        
        return nil
    }
    
    private func imageSeenMarker() -> SKLabelNode {
        let labelNode = SKLabelNode(text: "✅")
        labelNode.horizontalAlignmentMode = .center
        labelNode.verticalAlignmentMode = .center
        
        return labelNode
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showImageInformation"{
            if let imageInformationVC = segue.destination as? ImageInformationViewController,
                let actualSelectedImage = selectedImage {
                imageInformationVC.imageInformation = actualSelectedImage
            }
        }
    }
}