Generation of meta tags, how to implement?

Question

1C-Bitrix

Hello!
To specify metadata and h1 (for sections), I created additional fields.
Added properties for product cards.
It is necessary to implement auto-generation of metadata for those sections/products for which they are not registered in new fields.
figured out how to get field values ​​for sections:

the code

if(0 < intval($arResult["VARIABLES"]["SECTION_ID"])) {
                        $arFilter["ID"] = $arResult["VARIABLES"]["SECTION_ID"];
                    } elseif("" != $arResult["VARIABLES"]["SECTION_CODE"]) {
                        $arFilter["=CODE"] = $arResult["VARIABLES"]["SECTION_CODE"];
                    }

                    $arSelect = array("UF_META_T", "UF_META_K", "UF_META_D", "UF_H1");

                    $rsSections = CIBlockSection::GetList(array(), $arFilter, false, $arSelect);
                    if($arSection = $rsSections->Fetch()) {

                        $_h1_ = $arSection["UF_H1"];
                        $_title_ = $arSection["UF_META_T"];
                        $_desc_ = $arSection["UF_META_D"];
                        $_keyw_ = $arSection["UF_META_K"];
                    }

(public_html\bitrix\templates\tshop\components\bitrix\catalog\main\section.php - here it seems to work as it should.)
But I don’t understand where to write setPageProperty().
tried writing in the same file as the code above - doesn't help
tried writing in component epilog - doesn't work either

Answer 1

In component_epilog, setPageProperty() works if your data reaches this file.
Do not forget about the cache and the need to remove data from it:

$this->setResultCacheKeys([
        'YOUR_PARAM',
    ]);

in general, all properties of the section, if you have rendered your data in this way, are available in the catalog component. You just need to fill in the data in the meta fields using the methods of deferred functions.
example from the docs :

$APPLICATION->AddBufferContent('ShowCondTitle');
function ShowCondTitle()
{
  global $APPLICATION;
 if (!$APPLICATION->GetTitle())
    return "Стандартная страница";
 else
    return $APPLICATION->GetTitle();
}