title: Objective C, Correct way to "Call from Main Thread"?
body: <p>I am aware most people do <code>dispatchqueue.main.async</code> or <code>dispatch_async(dispatch_get_main_queue(), ^{</code> but what would be the correct way to call from main thread for Objective C?</p>
  <p>Specifically I wanna call a textfieldview from main thread inside a query code.</p>