A category for downloading image from URL and display it in UIImageView in iOS

UIImageView+DownloadURL.swift

extension UIImageView {
    static var dataTask: URLSessionDataTask?
    func download(urlString: String) {
        guard let url = URL(string: urlString) else {
            print("\(urlString) is not a valid url")
            return
        }
        if let existingTask = UIImageView.dataTask {
            if existingTask.state == .running {
                existingTask.cancel()
            }
        }
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            if let error = error {
                print("An error occured while dowloading image from url \(url) error:\(error)")
                return
            }
            guard let httpResponse = response as? HTTPURLResponse,
                (200...299).contains(httpResponse.statusCode) else {
                    print("\(response.debugDescription)")
                    return
            }
            guard let data = data else {
                print("data is not valid")
                return
            }
            guard let image = UIImage(data: data) else {
                print("Cannot create image from data")
                return
            }
            DispatchQueue.main.async {
                self.image = image
            }
        }
        task.resume()
        UIImageView.dataTask = task
    }
}