How To Downloading Image from server URL on Swift 4?

This tutorial to download image from server using the URLSession. Here create extension of download image. And after successfully response load the image in imageView.

extension on UIImageView to download image:

extension UIImageView {
    func dowloadFromServer(url: URL, contentMode mode: UIViewContentMode = .scaleAspectFit) {
        contentMode = mode
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard
                let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
                let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
                let data = data, error == nil,
                let image = UIImage(data: data)
                else { return }
            DispatchQueue.main.async() {
                self.image = image
            }
            }.resume()
    }
    func dowloadFromServer(link: String, contentMode mode: UIViewContentMode = .scaleAspectFit) {
        guard let url = URL(string: link) else { return }
        dowloadFromServer(url: url, contentMode: mode)
    }
}

Set downloaded image in UIImageView

override func viewDidLoad() {
    super.viewDidLoad()
    let imageV = UIImageView(frame: CGRect(x: 90, y: 200, width: 200, height: 200))
    imageV.layer.borderWidth = 5
    imageV.layer.borderColor = UIColor.red.cgColor
    imageV.dowloadFromServer(link: "https://yt3.ggpht.com/a-/ACSszfFprNp-1Ay1IhDjH4NenwvLItZpPHeJdewulw=s900-mo-c-c0xffffffff-rj-k-no", contentMode: .scaleAspectFill)
    self.view.addSubview(imageV)

}