Creating protruding button from tab bar on iOS
<p>I've seen a couple of apps that have 1 button in what looks like a UITabBar protruding outside the frame.</p>

<p>How does one go about doing something like this? Code samples/tutorial suggestions to read would be much appreciated.</p>

<p>Here's a photo from one the apps I've seen this in.</p>

<p><img src="http://i.stack.imgur.com/Q6Hyu.png" alt="enter image description here"></p>
