waitUntilAllTasksAreFinished error Swift

Question

I have this call in my loginViewController when Submit button is pressed:

let http = HTTPHelper()
    http.post(\"http://someUrl.com/Login/userEmail/\\(username.         


        

Answer 1

I was having this issue when trying to change the contents of a text box from inside an Async Task.

The solution was using the DispatchQueue (Xcode 8.0 and Swift 3.0):

    DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
       self.textBox.text = "Some Value"
       }