symfony-2.1 - Create ViewHelper in Symfony 2

Question

How to create a ViewHelper in Symfony 2. I read whole the documentation but it doesn't describe any term like that. It just has autoloading and service. http://symfony.com/doc/current/cookbook/index.html

Answer 1

您只需要创建一个实现您的辅助函数并扩展的类

Symfony\Component\Templating\Helper\Helper

像这样：

namespace Acme\Foo\Helper;


use Symfony\Component\Templating\Helper\Helper;

class MyViewHelper extends Helper {

    public function helpMe() {
       // do something
       return $value;
    }

   /**
    * @inheritdoc
    */
    public function getName() {
         return "anyCanonicalServiceName";
    }
}

然后你必须将你的助手推广为一个带有特殊标签的服务，例如

Resources/config/services.yml


services:
        your_service_name:
        class: Acme\Foo\Helper\MyViewHelper
        # the tag alias "myViewHelper" is later used in the view to access your service
        tags:
            - { name: templating.helper, alias: myViewHelper }

现在您可以在这样的视图中访问帮助程序：

echo $view['myViewHelper']->helpMe();