[小技巧]image url 轉成圖

var imgURLString = "http://graph.facebook.com/" + (fid as String) + "/picture?type=large" 

        let imgURL = NSURL(string: imgURLString)
        let imageData = NSData(contentsOfURL: imgURL!)
        let image = UIImage(data: imageData!)

        self.HeadImage.image = image