How to Async Image download in swift 3

//Make a method by extension of class
//create any where

extension UIImageView {

    func downloadedFrom(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 downloadedFrom(link: String, contentMode mode: UIViewContentMode = .scaleAspectFit) {

        guard let url = URL(string: link) else { return }

        downloadedFrom(url: url, contentMode: mode)

    }

}

//usage by calling any where

 self.profileimgOut.downloadedFrom(link:"YOUR IMAGE URL")