title: iOS: pass data to another class
body: <p>I have my class named "Service" where inside I do a lot of GET/POST request with Alamofire, an example of request id this</p>
  
  <pre><code>func requestDocuments(){
  
          request(.POST, "http://example.com/json/docs")
              .responseJSON { (_, _, JSON, error) in
  
                  if error == nil{
  
                      var response = JSON as NSArray
                      println("array document: \(response)")
  
  
                      //**** HERE I WANT PASS VALUE TO MY VIEW CONTROLLER
                  }
                  else{
  
                  }
          }
      }
  </code></pre>
  
  <p>and from my viewcontroller:</p>
  
  <pre><code>    let service = Service.sharedInstance
  
      service.requestDocuments()
  </code></pre>
  
  <p>What can I use? delegate method? or what? 
  what is the best solution in swift?</p>