Animated status bar style transition, a la iPod app
<p>In the iPod app, the navigation views have the default status bar style, and the Now Playing view is in the black style. The transition between them is animated with a crossfade. I want to do that.</p>

<p>My first attempt:</p>

<pre><code>[UIView beginAnimations:@"whatever" context:nil];
[UIView setAnimationDuration:0.5];
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlack
[UIView commitAnimations];
</code></pre>

<p>No joy, it pops to black. Takers?</p>
