ZF3 - EventManager and dispatch event - zend-framework2

Question

in an older ZF2 application I change the layout in a dispatch listener, if the matched route starts with admin. Now I started a new project and want to use ZF3 components, but the event manager does have some changes and I get the following exception:
Uncaught TypeError: Argument 2 passed to Zend\EventManager\EventManager::attach() must be callable, none given
I don't know really how to handle this in ZF3. Here are my relevant source codes to change the layout in my ZF2 application:
Module.php
namespace Admin;
use Zend\EventManager\EventInterface;
use Zend\ModuleManager\Feature\BootstrapListenerInterface;
class Module implements BootstrapListenerInterface {
public function onBootstrap(EventInterface $event) {
$application = $event->getApplication();
$eventManager = $application->getEventManager();
$serviceManager = $application->getServiceManager();
$eventManager->attach($serviceManager->get('Admin\Listener\Dispatch'));
}
}
DispatchListener.php
namespace Admin\Listener;
use Zend\EventManager\AbstractListenerAggregate;
use Zend\EventManager\EventInterface;
use Zend\EventManager\EventManagerInterface;
use Zend\Mvc\MvcEvent;
class DispatchListener extends AbstractListenerAggregate {
public function attach(EventManagerInterface $eventManager) {
$this->listeners[] = $eventManager->attach(
MvcEvent::EVENT_DISPATCH, array($this, 'onDispatch'), 100
);
}
public function onDispatch(EventInterface $event) {
$matchedRouteName = $event->getRouteMatch()->getMatchedRouteName();
if (strpos($matchedRouteName, 'admin') === 0) {
$event->getViewModel()->setTemplate('layout/admin');
}
}
}

Answer 1

zf3 is more focused on decoupling components, it seems aggregates has been removed to attach event see the api document
event manager
for short the attach message says
attach($eventName, callable $listener, $priority = 1) : callable
I hope since you are not specifying the eventName you are getting the error message
update:
see the link to migration guide from v2 to v3 for event manager
Removed functions

Answer 2

In ZF3 you can change your layout for your controller this easy way:
<?php
namespace YourCompanyModule;
use Zend\ModuleManager\ModuleManager;
use Zend\Mvc\MvcEvent;
class Module
{
// The "init" method is called on application start-up and
// allows to register an event listener.
public function init(ModuleManager $manager)
{
// Get event manager.
$eventManager = $manager->getEventManager();
$sharedEventManager = $eventManager->getSharedManager();
// Register the event listener method.
$sharedEventManager->attach(__NAMESPACE__, 'dispatch',
[$this, 'onDispatch'], 100);
}
// Event listener method.
public function onDispatch(MvcEvent $event)
{
// Get controller to which the HTTP request was dispatched.
$controller = $event->getTarget();
// Get fully qualified class name of the controller.
$controllerClass = get_class($controller);
// Get module name of the controller.
$moduleNamespace = substr($controllerClass, 0, strpos($controllerClass, '\\'));
// Switch layout only for controllers belonging to our module.
if ($moduleNamespace == __NAMESPACE__) {
$viewModel = $event->getViewModel();
$viewModel->setTemplate('layout/layout2');
}
}
// ...
}