我正在尝试访问视图助手中的服务定位器，以便我可以访问我的配置。我使用这个视图助手递归函数，所以我不知道在哪里声明服务定位器。
namespace Application'View'Helper;
use Zend'View'Helper'AbstractHelper;
use CatMgt'Model'CategoryTable as RecursiveTable;
class CategoryRecursiveViewHelper extends AbstractHelper
{
protected $table;
public function __construct(RecursiveTable $rec)
{
$this->table = $rec;
}
public function __invoke($project_id, $id, $user_themes_forbidden, $level, $d, $role_level)
{
$config = $serviceLocator->getServiceLocator()->get('config');
//So i can access $config['templates']
$this->__invoke($val->project_id, $id, $user_themes_forbidden, $level, $d, $role_level);
}
}
我尝试了解决方案，给出这里的链接
但是它没有帮助，这样做是可以的吗?
namespace Application'View'Helper;
use Zend'View'Helper'AbstractHelper;
use CatMgt'Model'CategoryTable as RecursiveTable;
use Zend'View'HelperPluginManager as ServiceManager;
class CategoryRecursiveViewHelper extends AbstractHelper
{
protected $table;
protected $serviceManager;
public function __construct(RecursiveTable $rec, ServiceManager $serviceManager)
{
$this->table = $rec;
$this->serviceManager = $serviceManager;
}
public function __invoke($project_id, $id, $user_themes_forbidden, $level, $d, $role_level)
{
$config = $this->serviceManager->getServiceLocator()->get('config');
//So i can access $config['templates']
$this->__invoke($val->project_id, $id, $user_themes_forbidden, $level, $d, $role_level);
}
}
首先，你的ViewHelper是一个无限循环，你的应用会像那样崩溃。你在__invoke中调用__invoke——这是行不通的。
使用依赖项注册ViewHelper
首先，您可以这样写ViewHelper:
class FooBarHelper extends AbstractHelper
{
protected $foo;
protected $bar;
public function __construct(Foo $foo, Bar $bar)
{
$this->foo = $foo;
$this->bar = $bar;
}
public function __invoke($args)
{
return $this->foo(
$this->bar($args['something'])
);
}
}
接下来是注册ViewHelper。因为它需要依赖，所以你需要使用工厂作为目标。
// module.config.php
'view_helpers' => [
'factories' => [
'foobar' => 'My'Something'FooBarHelperFactory'
]
]
目标现在是一个工厂类，我们还没有编写。所以继续:
class FooBarHelperFactory implements FactoryInterface
{
public function createService(ServiceLocatorInterface $sl)
{
// $sl is instanceof ViewHelperManager, we need the real SL though
$rsl = $sl->getServiceLocator();
$foo = $rsl->get('foo');
$bar = $rsl->get('bar');
return new FooBarHelper($foo, $bar);
}
}
现在你可以通过$this->foobar($args)在任何视图文件中使用ViewHelper了。
不要将ServiceLocator作为依赖项使用
当你依赖ServiceManager时，你就陷入了糟糕的设计。您的类将具有未知类型的依赖关系，并且它们是隐藏的。当你的类需要一些外部数据时，让它通过__construct()直接可用，不要通过注入ServiceManager来隐藏依赖关系。