Design Controller Extension Hooks

template_types()

Add template types to ExpressionEngine’s default set. In the Output library specifically, it is useful to return the appropriate content type header for the template type.

How it’s called:

$template_types = $EE->extensions->call('template_types');

This hook must append a key to the $last_call array in the following format:

$custom_templates = ee()->extensions->last_call;

$custom_templates['ical'] = array(             // Short name for database
    'template_name'           => 'iCal Feed',  // Display name for Template Type dropdown
    'template_file_extension' => '.ics',       // File extension for saving templates as files
    'template_headers'        => array(        // Custom headers for file type
        'Content-Type: text/ical',
        'Content-Disposition: attachment; filename="event.ics"'
    )
);

Note: It is good practice to clean up the templates table and remove your custom template type from templates using it upon extension uninstallation.