我使用transition\\u post\\u状态解决了这个问题。

function check_post_title_length($new_status, $old_status, $post){

    if($new_status == \'auto-draft\' || $new_status == \'draft\'){
        return;
    }

    if(str_word_count($post->post_title, 0) > 12){
        //update-nag is the term for a yellow warning box in admin_notices
        //notice here I use the WP_Error data field to choose the type of error box to show
        $admin_notices = new WP_Error(\'check_post_title_length\',\'If possible, consider making the post title shorter.\', \'update-nag\');
        //we could also if we needed, add more notices to the list such as
        //$admin_notices->add(\'some_other_check\', \'Sorry you need to add an author\');
        add_user_meta(get_current_user_id(), \'admin_notices\', $admin_notices, true);
    }
}
add_action(\'transition_post_status\', \'check_post_title_length\', 10, 3);

function display_admin_notices(){
    $user_id = get_current_user_id();
    $admin_notices = get_user_meta($user_id, \'admin_notices\', true);

    if(!empty($admin_notices)){
        //make sure its a WP_Error object
        if(is_wp_error($admin_notices)){
            //delete error from user meta so error is gone on page reload
            delete_user_meta($user_id, \'admin_notices\');
            $notices = $spm_admin_notices->get_error_messages();

            if(!empty($notices)){
                $notice_type = $admin_notices->get_error_data();
                if(!empty($notice_type)){
                ?>
                    <div class="<?php echo $notice_type; ?>">
                <?php
                } else {
                ?>
                    <div class="error">
                <?php
                }
                //here we loop through all notices we want to display
                //this is useful if the user needs to adjust more than one item
                foreach($notices AS $notice){
                ?>
                    <p><?php echo $notice; ?></p>
                <?php
                }
                ?>
                </div>
                <?php
            }
        }
    }
}
add_action(\'admin_notices\', \'display_admin_notices\');