Page::getActionLink() 

\nn\t3::Page()->getActionLink($pid = NULL, $extensionName = '', $pluginName = '', $controllerName = '', $actionName = '', $params = [], $absolute = false); 

Get link to an action / controller

\nn\t3::Page()->getActionLink( $pid, $extName, $pluginName, $controllerName, $actionName, $args );
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Example for the news extension:

$newsArticleUid = 45;
$newsDetailPid = 123;
\nn\t3::Page()->getActionLink( $newsDetailPid, 'news', 'pi1', 'News', 'detail', ['news'=>$newsArticleUid]);
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| @return string

Source Code 

public function getActionLink( $pid = null, $extensionName = '', $pluginName = '', $controllerName = '', $actionName = '', $params = [], $absolute = false ) {
	$extensionService = GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Service\ExtensionService::class);
	$argumentsPrefix = $extensionService->getPluginNamespace($extensionName, $pluginName);
	$arguments = [
		$argumentsPrefix => [
			'action' => $actionName,
			'controller' => $controllerName,
		],
	];
	$arguments[$argumentsPrefix] = array_merge($arguments[$argumentsPrefix], $params);
	return $this->getLink( $pid, $arguments, $absolute );
}
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