title: UITextField "value changed" not firing when field is updated
body: <p>I have an <code>IBAction</code> that I have connected to a <code>UITextField</code> element in Interface Builder. (Firing on "value changed" event)</p>
  
  <p>I also have a <code>UISlider</code> that updates the TextField element automatically when it's value gets adjusted.</p>
  
  <p>When I run my app, the TextField does get updated when I adjust the slider, but the "value changed" event does not fire when this happens. The value changed event also does not fire when I edit the TextField by hand as well. (Although using the Did Editing End trigger does cause it to fire).</p>
  
  <p>My question is, how can I get the value changed trigger to fire for both a programmatic update of the TextField as well as when the user adjusts the value.</p>