iOS: pass data to another class

Question

I have my class named "Service" where inside I do a lot of GET/POST request with Alamofire, an example of request id this

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{

                }
        }
    }

and from my viewcontroller:

    let service = Service.sharedInstance

    service.requestDocuments()

What can I use? delegate method? or what? what is the best solution in swift?

Answer 1

func requestDocuments(completion:(data:NSArray?)){

        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

                    completion(data:response)
                }
                else{
                   completion(data:nil)
                }
        }
    }



 var reqDoc = requestDocuments(){ (data) -> Void in 
      if let _data = data {
         dispatch_async(dispatch_get_main_queue()) {
         //Do something with data
         }
      }

}

I think closures is the best solution.