Blog_UnownedVsWeak_tryingWithoutUnownedOrWeak.swift

let imageToBeShown = "https://images.pexels.com/photos/221433/pexels-photo-221433.jpeg"
func tryNone() {
        // let's get image data from server to load it in our imageview.
        self.getData(from: URL.init(string: self.imageToBeShown)!) { (data, response, error) in
            DispatchQueue.main.async {
                self.imageView.image = UIImage.init(data: data!)
            }
        }
}
func getData(from url: URL, completion: @escaping (Data?, URLResponse?, Error?) -> ()) {
        URLSession.shared.dataTask(with: url, completionHandler: completion).resume()
}