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@IBOutlet weak var progressView: UIProgressView!
@IBOutlet weak var downloadProgressLabel: UILabel!

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var defaultSession = URLSession(configuration: .default)

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let url = URL(string: "http://www.google.com")

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static func downloadImage(url: URL, completion: @escaping (_ image: UIImage?, _ error: Error? ) -> Void) {
        if let cachedImage = imageCache.object(forKey: url.absoluteString as NSString) {
            completion(cachedImage, nil)
        } else {
            MTAPIClient.downloadData(url: url) { data, response, error in
                if let error = error {
                    completion(nil, error)
                    
                } else if let data = data, let image = UIImage(data: data) {
                    imageCache.setObject(image, forKey: url.absoluteString as NSString)

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  if let cachedImage = imageCache.object(forKey: url.absoluteString as NSString) {
            completion(cachedImage, nil)
  }

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func downloadImage(url: URL, completion: @escaping (UIImage?) -> Void) 

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let imageCache = NSCache<NSString, UIImage>()

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class MainViewController: UIViewController {
    
    @IBOutlet var mainView: MainView!

    override func viewDidLoad() {
        super.viewDidLoad()
        mainView.delegate = self
    }
}

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extension ViewController: MainViewDelegate {  
      func searchButtonTappedWithTerm(with searchTerm: String) {
        print("The text in UITextField is: \(searchTerm)")
    }
 }

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class MainView: UIView {

    @IBOutlet private weak var myTextfield: UITextField!
    @IBOutlet private weak var myButton: UIButton!
    
    weak var delegate: MainViewDelegate?
    
    override func layoutSubviews() {
        super.layoutSubviews()
        myButton.addTarget(self, action: #selector(buttonTap), for: .touchUpInside)