Loading image from URL with SWIFT

Found this snippet provided by a stackoverflow user helpful. It loads a remote image async. Helps with performance when loading several images over the network to populate your table cells . This snippet extends the UIImageView Class with an added method imageFromURL(urlString:String)

extension UIImageView {
    public func imageFromUrl(urlString: String) {
        if let url = NSURL(string: urlString) {
            let request = NSURLRequest(URL: url)
            NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) {
                (response: NSURLResponse?, data: NSData?, error: NSError?) -> Void in
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            }
        }
    }
}