always returns nil in iPhone
<p>I am trying to apply Mike Chen's answer <a href="http://stackoverflow.com/questions/1325897/how-can-i-take-a-photo-frequently-with-iphone/1328176#1328176">here</a>, using SDK 3.0. In delegate.m file I implement;</p>

<pre><code>[viewController.view addSubview:[[objc_getClass("PLCameraController") sharedInstance] previewView]];
</code></pre>

<p>and in viewcontroller.m I implement:</p>

<pre><code>PLCameraController *cam = [objc_getClass("PLCameraController") sharedInstance];
CapturedImage = [cam _createPreviewImage];
</code></pre>

<p>but 'cam' is always nil. Any suggestions?   </p>
