title: easy way to highlight ios text box when it has focus?
body: <p>Our iOS6 app is data-entry-heavy and has small fonts, and we want to make it easier for users to find the currently focused field among many fields on the screen. </p>
  
  <p>First, I notice that iOS by default doesn't do anything to draw the user's eye to a focused text field, unlike many other platforms and apps. Is this because it's an explicit design guideline or implicit app-store requirement that text fields should <em>not</em> display a focus highlight?  I don't want to get our app ejected from the app store for this minor thing. ;-)</p>
  
  <p>Assuming focus highlighting is allowed, is there an easy way to show a "glow" inside or outside the text box when it gets focus, like I can do with CSS on a web app using <code>box-shadow</code>, as in <a href="http://jsfiddle.net/eYZWt/1/" rel="nofollow">this jsFiddle</a>. </p>
  
  <p>Finally, do you know good examples of iOS apps that have done what we're trying to do?</p>