Zend check if view exist - class does not work - view

Question

I have found this class:
https://github.com/lloydwatkin/Demos/blob/master/zendframework/renderifexists/RenderIfExists.php
The code looks like this:
<?php
/**
* View helper to render a view file if it exists
*
* #author Lloyd Watkin
* #since 12/12/2010
* #package Pro
* #subpackage View
*/
/**
* View helper to render a view file if it exists
*
* #author Lloyd Watkin
* #since 12/12/2010
* #package Pro
* #subpackage View
*/
class Pro_View_Helper_RenderIfExists
extends Zend_View_Helper_Abstract
{
/**
* Errors
*
* #var string
*/
const INVALID_FILE = 'Invalid file parameter';
/**
* Holds file name for processing
*
* #var string
*/
protected $_file;
/**
* Takes a products options array and converts to a formatted string
*
* #param string $file
* #return string
*/
public function renderIfExists($file)
{
if (!is_string($file) || empty($file)) {
throw new Zend_View_Exception(self::INVALID_FILE);
}
$this->_file = $file;
if (false === $this->_fileExists()) {
return '';
}
return $this->view->render($file);
}
/**
* Check to see if a view script exists
*
* #return boolean
*/
protected function _fileExists()
{
$paths = $this->view->getScriptPaths();
foreach ($paths as $path) {
if (file_exists($path . $this->_file)) {
return true;
}
}
return false;
}
}
I want to check if a view exists; If it does: Show it.
I have placed the file in my /library/. When I call $this->renderIfExists('info-box.phtml'); from the controller I get this error:
Message: Method "renderIfExists" does not exist and was not trapped in __call()
How can I fix this?
Thanks in advance!

Answer 1

to call a view helper from the controller, you should use:
$this->view->renderIfExists()

Answer 2

bit late to this, but the code you've got above is something I wrote. Have you registered the helper path, if w would the framework know where to load the file?