Just add:
'post_title' => $_POST['fields']['field_yourfieldnumber']
to your array.
For example:
$post = array(
'post_status' => 'publish' ,
'post_title' => $_POST['fields']['field_1'],
'post_type' => 'example' ,
);
I think everyone is just missing [‘fields’] before the field name.
Compliments to Aaron Ranger for his tutorial:
http://www.telegraphicsinc.com/2013/07/how-to-add-new-post-title-using-aacf_form/