构造函数注入

/**
 * @var \Vendor\Module\Helper\Data
 */
protected $customHelper;

/**
 * Constructor call
 * @param \Vendor\Module\Helper\Data $customHelper
 */
public function __construct(
    \Vendor\Module\Helper\Data $customHelper
)
{
    $this->customHelper = $customHelper;
    parent::__construct();
}