title: IOS 7 - Detect change in a text field
body: <p>I want to know how to detect changes in a text field. I know we can use Did End On Exit but this works only when once the user finishes typing on the textfield and presses return or clicks elsewhere. I want to know how to detect each entering or deleting of a letter/number in a text field i.e. If the initial text in the text field is badge. As soon as the user presses the delete button to make the text "badg" I want to run a method and once the user presses the delete again to make it "bad" I want to run a method etc.</p>
  
  <p>Thanks:)</p>