Advanced Custom Fields Seetings with ACF Builder

act-settings-builder.php

<?php
/**
 * Module name: Custom Settings
 *
 * @package  ACF
 * @see README.md for details
 */

use StoutLogic\AcfBuilder\FieldsBuilder;

/**
 * Register the needed fields for events.
 */
if ( function_exists( 'acf_add_local_field_group' ) ) {
	$acf_module = new FieldsBuilder( 'custom_settings', [
		'title' => __( 'Custom Settings', 'acf_plus' ),
		'position' => 'side'
	] );
	$acf_module
		->addSelect( 'acf_settings_header_style', [
			'label' => __( 'Header Style', 'acf_plus' ),
			'choices' => [
				'default',
				'light'
			]
		] )
		->setLocation( 'post_type', '==', 'page' )
			->or('post_type', '==', 'post');
	acf_add_local_field_group( $acf_module->build() );
}

/**
 * Include partial of module
 *
 * @param mixed $content WordPress post content.
 *
 * @return mixed
 */
function acf_plus_custom_settings_body_class( $classes ) {

	if ( is_page() or is_single() ) {
		$acf = get_field('acf_settings_header_style');
		$classes[] = $acf ? 'is-' . $acf : '';
	}

	return $classes;
}
add_filter( 'body_class', 'acf_plus_custom_settings_body_class', 10 );