Why I cannot change views page title using views_post_render?

Question

I have view that uses url args: parent term id and term id/ids, so the url structure is like page/%/%

Title pattern for this view is: %1(%2)

However I have few pages with multi tids as second argument, so generated title is strange (very long). I am trying to change this title programmatically:

function bip_title_alter_views_post_render(&$view, &$output, &$cache)  {

    if ($view->name == 'kategorie_artykulow' && $view->current_display == 'page_9')
    {
        $args = explode(' ', $view->args[1]);
        if (sizeof($args) < 2) {
            return;
        }
        $title_pattern = 'Archiwum Oświadczeń Majątkowych w %dr.';
        $term = taxonomy_term_load($args[0]);
        if (! $term) {
            return;
        }
        $title = sprintf($title_pattern, $term->name);
        drupal_set_title($title);
    }
}

function bip_title_alter_module_implements_alter(&$implementations, $hook) {
    if ($hook == 'views_post_render') {
        $group = $implementations['bip_title_alter'];
        unset($implementations['bip_title_alter']);
        $implementations['bip_title_alter'] = $group;
    }
}

but title remains the same, I am sure that I am altering proper view.

Adding another display to view is not good option for me, because I have a lot existing urls and if I create another display with the same url structure and different args config always first display is handling request.

edit

I changed my custom module weight in system table to 9999 and I still see that title is altered after my module hook :/ It's so annoying

Answer 1

I always use a hook_views_pre_view():

function mymodule_views_pre_view(&$view, &$display_id, &$args) {
  if ($view->name == "foo" && $view->current_display == "bar") {
    $view->display[$view->current_display]->display_options["title"] =
    $view->display[$view->current_display]->handler->options["title"] = "The New Title";
  }
}

This should then funnel up to be pulled in as the page title, but I never use views directly as pages.

Answer 2

Thanks to @Andy advice the solution is so simple.

Views set title after calling to views_pre_render and views_post_render: (views_plugin_display_page.inc)

  // And now render the view.
    $render = $this->view->render();

    // First execute the view so it's possible to get tokens for the title.
    // And the title, which is much easier.
    drupal_set_title(filter_xss_admin($this->view->get_title()), PASS_THROUGH);

If there is a get method there is a big chance that setter exists ;)

So calling:

$view->set_title($title);

inside hook (pre or post) do the job

Answer 3

I would use hook_views_pre_render and alter the views display title.

Refer to http://drupal.org/node/438370 as well.