Next and Previous to navigate text fields
<p>I have a sign-up form in my application with several UITextFields.  In order to speed up the process I would like to add a next and previous button to a toolbar pinned above the keyboard and allow the user to "tab" between the fields using these buttons.</p>

<p>I know I can navigate through the subviews collection on my view, but I was wondering if there was a cleaner way to do this?</p>

<p>This functionality is implemented in safari as seen in the following screenshot:</p>

<p><img src="https://dl.getdropbox.com/u/22784/keyboardToolbar.png" alt="alt text" /></p>
