How to return the data when it called from the web service iOS swift [duplicate]

This question already has an answer here:

• How can I get the Data from NSURLSession.sharedSession().dataTaskWithRequest 1 answer

I need to return the value of dictionary after loading the data from the web service

My code:

func callingWebservice (link:String , POST:String)->[String : AnyObject]{
  var shotsDataaaa = [String:AnyObject]()
  let request = NSMutableURLRequest(URL: NSURL(string: link)!)
  request.HTTPMethod = "POST"
  let postString = POST
 dispatch_async(dispatch_get_main_queue()) {

  request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
  let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {

          (data,response,error)  in
          do {
               shotsDataaaa = try NSJSONSerialization.JSONObjectWithData(data! , options: NSJSONReadingOptions.MutableContainers) as! [String : AnyObject]
             print(shotsDataaaa)

          }catch{
              print("fe sabab tanyyy")
          }
      }
      task.resume()
  }
  return shotsDataaaa
}

This is the result result

I need to return the data not empty dictionary.