base_controller.swift

import CoreML
import Vision
import UIKit

class ViewController: UIViewController {

  // MARK: - IBOutlets
  @IBOutlet weak var scene: UIImageView!
  @IBOutlet weak var answerLabel: UILabel!

  // MARK: - View Life Cycle
  override func viewDidLoad() {
    super.viewDidLoad()

    guard let image = UIImage(named: "scenery") else {
      fatalError("no starting image")
    }

    scene.image = image
  }
}

// MARK: - IBActions
extension ViewController {

  @IBAction func pickImage(_ sender: Any) {
    let pickerController = UIImagePickerController()
    pickerController.delegate = self
    pickerController.sourceType = .savedPhotosAlbum
    present(pickerController, animated: true)
  }
}

// MARK: - UIImagePickerControllerDelegate
extension ViewController: UIImagePickerControllerDelegate {

  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    dismiss(animated: true)

    guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage else {
      fatalError("couldn't load image from Photos")
    }

    scene.image = image
  }
}

// MARK: - UINavigationControllerDelegate
extension ViewController: UINavigationControllerDelegate {
}