ViewControllerAsyncAwait.swift

import UIKit

class ViewController: UIViewController {
  @IBOutlet weak var imageView: UIImageView!
  
  var image: UIImage? = nil
  
  override func viewDidLoad() {
    super.viewDidLoad()
    awaitImage()
  }
  static let urlString = "https://upload.wikimedia.org/wikipedia/commons/0/0e/Faroese_sheep_Sumba_1.jpg"
  
  static func getImage() async -> UIImage? {
    guard let url = URL(string: urlString) else { return nil }
    if let data = try? Data(contentsOf: url) {
      return UIImage(data: data)
    } else {
      return nil
    }
  }
  
  @asyncHandler internal func awaitImage() {
    await self.image = Self.getImage()
    DispatchQueue.main.async {
      self.imageView.image = self.image
    }
  }
}