In Swift how to call method with parameters on GCD main thread? -

In my app I have a function that creates an NSRURL session and uses

  Sesh.dataTaskWithRequest (req, completionHandler: {(Data, Feedback, Error)  

In this whole block of work, I need to make some calculations which call Adds a UIImage to the View Controller if I calculate the UIMAJ-add, so if I try to run it then the integer To see the code inside the block, Xcode says an error that I can not use the layout engine in the background process, so I found some code on SO, which tries to line a method on the main thread:

sending time = send_time (DISPATCH_TIME_NOW, Int64 (0.0 * double (NSC_ PER_MSEC)) Send-time (time, transmission_gate_mine_qu), {back = UIApplication.sharedAppl Ication (.) SendAction (" DisplayQRCode: ", to: self.delegate, from: self, avent: zero)})

However, I do not know how the parameters of this function the "call Adder" and "volume BTC" I can recommend an optimal way to add I can do this, or a method call in the queue of an application?

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Just type it in the completion handler . There is no need to use dispatch_start_start

  dispatch_async (dispatch_get_main_queue ()), {Representative Representative OBZ = UIApplication Edit Your Ad Representative as the representative of the Cloud. Oz UDIJ ("your strings")}  

Swift 3:

  Dispatch Queue .main.async {delegateObj = UIApplication SharedApplication () Representative to  for remittance to the main line   
  Dispatches Queue as YourAppDelegateClass delegateObj.addUIIage ("yourstring")}  
 
 .main.asyncAfter (deadline: .now () + 0.1) {// your code here}  

change YourAppDelegateClass representative class with you