TYPO3 set title of fluid page object from extension - typo3

Question

I want to set the the page title within my extension, so the current {page} object in the Fluid Templates will also show the set title.
$GLOBALS['TSFE']->altPageTitle = $pageTitle; will only set the <title> tag and has no impact to the {page.title}
My Primary Goal: To show the 'correct' title of a detail page within a breadcrumb.
Any ideas how to manipulate that?

Answer 1

I don't know anything about a {page} object in fluid, so I did it with a ViewHelper similar to the one from here
/**
* A view helper for setting the document title in the <title> tag.
*
* = Examples =
*
* <page.title mode="prepend" glue=" - ">{blog.name}</page.title>
*
* <page.title mode="replace">Something here</page.title>
*
* <h1><page.title mode="append" glue=" | " display="render">Title</page.title></h1>
*
* #license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License, version 3 or later
*/
class PageTitleViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {
/**
* #var bool
*/
protected $escapeOutput = false;
/**
* #param string $mode Method for adding the new title to the existing one.
* #param string $glue Glue the new title to the old title with this string.
* #param string $display If render, this tag displays it's children. By default it doesn't display anything.
* #return string Rendered content or blank depending on display mode.
* #author Nathan Lenz <nathan.lenz#organicvalley.coop>
*/
public function render($mode = 'replace', $glue = ' - ', $display = 'none') {
$renderedContent = $this->renderChildren();
$existingTitle = $GLOBALS['TSFE']->page['title'];
if ($mode === 'prepend' && !empty($existingTitle)) {
$newTitle = $renderedContent.$glue.$existingTitle;
} else if ($mode === 'append' && !empty($existingTitle)) {
$newTitle = $existingTitle.$glue.$renderedContent;
} else {
$newTitle = $renderedContent;
}
$GLOBALS['TSFE']->page['title'] = $newTitle;
$GLOBALS['TSFE']->indexedDocTitle = $newTitle;
if ($display === 'render') {
return $renderedContent;
} else {
return '';
}
}
}

Answer 2

For cached pages and plugins this should work:
$GLOBALS['TSFE']->page['title'] = $pageTitle;