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Check Application version | iOS | Swift

Show the alert within application for update the application. func checkApplicationVersion(){         let urlString = String (format: "http://itunes.apple.com/lookup?id=%@" , AppleAppID )         let url = NSURL (string: urlString)         let urlRequest = NSURLRequest (URL: url!)         NSURLConnection . sendAsynchronousRequest (urlRequest, queue: NSOperationQueue . mainQueue ()) { (response, data, error) -> Void in             if (error == nil )             {                 do {                     let appMetadataDictionary : NSDictionary = try NSJSONSerialization . JSONObjectWithData (data!, options: NSJSONReadingOptions .MutableContainers) as ! NSDictionary                     let resultsArray : NSArray = appMetadataDictionary. objectForKey ( "results" ) as ! NSArray                     let resultsDic : NSDictionary = resultsArray. firstObject as ! NSDictionary                     let iTunesVersion : String = r