updating a View Controller

[turabhassan89]

I have a simple view controller and after downloading the data I need to update the view controller based on the data that was downloaded but I have been able to figure out how to do a tableview.reloaddata() equivalent in a simple view controller.

I have code setup like this:

           print("starting to parse data")
            sharedNetworking.sharedInstance.downloadDataBusiness() { (fromDownload) in
            print("ready to parse")
            self.parseData (dataDownloaded: fromDownload)
        }
        print("parsing done")

But the first and third print statement always print first. I have also tried to put the code on the main thread and also in viewwillAppear function but it is not working. I have pushed my code for this as well.

[tabinks]

This is the correct behaviors. The first and third will execute first since they are on the same thread. The second will only fire once the network call is done.

[turabhassan89]

So what I am trying to do here is to download the data and after downloading parse it and save it and then do a lookup. I am able to download it and parse correctly but the lookup function tries for a lookup before the data is parsed. Does this mean that I need a completion handler within a completion handler? One for downloading the data(which I have right now) and one for parsing the data. How will I go about writing that?

sharedNetworking.sharedInstance.downloadDataBusiness() { (fromDownload) in
            print("ready to parse")
            self.parseData (dataDownloaded: fromDownload)
        }
        doALookup()