Swift wait until dataTaskWithRequest has finished to call the return

Question

I am new to Swift and I have a question regarding synchronous calls. I would like to make a synchronous call to dataTaskWithRequest, so that the return method is called once the dataTaskWithRequest is finished. Here is my code:

private func sendRequest (request: NSURLRequest) -> NSData{
    let session = NSURLSession.sharedSession()
    var dataReceived: NSData = NSData ()
    let task = session.dataTaskWithRequest(request) { data, response, error in
        if error != nil{
            print("Error -> \(error)")
            return
        }
    dataReceived = data!
    }
    task.resume()
    return dataReceived
}

What is the best way to do it? I have tried with a completion handler but I am not able to do it.

Thank you very much in advance for the help.

Answer 1

completion is the right and the best way in swift!

  func sendRequest (request: NSURLRequest,completion:(NSData?)->()){

    NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in
        if error != nil{
            return completion(data)
        }else{
            return completion(nil)
        }
    }.resume()
}

and call:

  sendRequest( yourRequest ) { data in
        if let data = data {
             // do something
        }
   }}