Custom post type archive, more pages don't work

Question

I have a site on which a lot of video's will be posted next week. The videos are posted with a custom post type, with just 'to', 'from' and yt video id. I wan to load a lot the videos on an archieve page, but not more than x per page. So x posts on page 1, x on page 2 and so on. Unfortunately, the page number doesn't show up, the 'p' container just stays empty. Here is my code:

      $args = array( 'post_type' => 'video'/*, 'posts_per_page' => 3 */);
        $loop = new WP_Query( $args );
        if (have_posts()) : 
    while ( $loop->have_posts()) : $loop->the_post(); 


                <?php endwhile; ?>
                <p><?php posts_nav_link('&#8734;','&laquo;&laquo; View newer posts','View older posts &raquo;&raquo;'); ?></p>
                <?php endif; ?>

I have emptied the part between the while, because in that part I only call to basic functions like the_permalink and the_content.

Answer 1

As it turns out, using posts_nav_link in tandem with WP_Query doesn't work as expected, since posts_nav_link relies on the global $wp_query object, and doesn't recognize the custom WP_Query instance.

This Answer should provide you the details you need in order to get everything to work.

<?php
global $wp_query;
$temp_wp_query = $wp_query;
$wp_query = null;

$paged = get_query_var('paged');
$args = array(
    'post_type' => 'video',
    'paged' => $paged ? $paged : 1
    /*, 'posts_per_page' => 3 */
);
$loop = new WP_Query( $args );
$wp_query = $loop;
if ($loop->have_posts()) : 
while ( $loop->have_posts()) : $loop->the_post(); 


<?php endwhile; ?>
<p><?php posts_nav_link('&#8734;','&laquo;&laquo; View newer posts','View older posts &raquo;&raquo;'); ?></p>
<?php
endif;
$wp_query = $temp_wp_query;
?>