title: UITextField Editing Changed not call
body: <p>I got a <code>UITextField</code> <em>zipTextField</em> and use <code>UIPicker</code> to change the text. And I want to know when the <em>zipTextField</em> is changed.</p>
  
  <p>I put this program in my <code>ViewController</code></p>
  
  <pre><code>@IBAction func textFieldEditingDidChange(sender: AnyObject){
      print("textField:\(zipTextField.text)")
  }
  </code></pre>
  
  <p>And Connected to the View with <strong>Editing Changed</strong> Event
  <a href="https://i.stack.imgur.com/8iCdO.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8iCdO.png" alt="connect to the view"></a></p>
  
  <p>But the function didn't call when <em>zipTextField</em> has changed</p>
  
  <p>Otherwise when I connect <code>textFieldEditingDidChange</code> to <strong>Editing Did End</strong> or <strong>Editing Did Begin</strong>  <em>textFieldEditingDidChange</em> will be called</p>