ios - How to pause/resume/cancel my download request in Alamofire -

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I am downloading a file using Alamofire with progress, but I do not know how to stop / again Starting / canceling specific request has been canceled. 

  @IBAction function downloadBtnTapped () {Alamofire.download (.Get, "http://httpbin.org/stream/100", Destination: Destination) .progress {(bytesRead, totalBytesRead, Println in totalBytesExpectedToRead) (totalBytesRead)}. {Response, response, _, error in println} (response)}} pauseBtnTapped (this function @IBAction: UIButton) {// I want to pause / cancel my download request here} <संदर्भ>    
 
  after "text" itemprop = "text"> 
 Keep a reference for the request made in  downloadBtnTapped  With a property, and  pauseBtnTapped  in that property  Canceled  call  
  above request:. Alamofire.Request? DownloadBtnTapped function @IBAction () {self.request = Alamofire.download (.Get, "http://httpbin.org/stream/100", Destination: Destination)} pauseBtnTapped function @IBAction (this: UIButton) {self.request ?. Cancel ()}

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