Admin Notices

acf-notice.php

if( !function_exists( 'the_field' ) && empty( get_option( 'my-acf-notice-dismissed' ) ) ) {
  add_action( 'admin_notices', 'my_acf_admin_notice' );
}

function my_acf_admin_notice() {
    ?>
    <div class="notice error my-acf-notice is-dismissible" >
        <p><?php _e( 'ACF is not necessary for this plugin, but it will make your experience better, install it now!', 'my-text-domain' ); ?></p>
    </div>


    <?php
}

ajaxhandler.php

add_action( 'wp_ajax_my_dismiss_acf_notice', 'my_dismiss_acf_notice' );

function my_dismiss_acf_notice() {
	update_option( 'my-acf-notice-dismissed', 1 );
}

dependency.php

if( !function_exists( 'the_field' ) ) {
  add_action( 'admin_notices', 'my_acf_notice' );
}

function my_acf_notice() {
  ?>
  <div class="update-nag notice">
      <p><?php _e( 'Please install Advanced Custom Fields, it is required for this plugin to work properly!', 'my_plugin_textdomain' ); ?></p>
  </div>
  <?php
}

dismiss.js

jQuery(document).on( 'click', '.my-acf-notice .notice-dismiss', function() {

    jQuery.ajax({
        url: ajaxurl,
        data: {
            action: 'my_dismiss_acf_notice'
        }
    })

})

enqueue.php

add_action( 'wp_enqueue_scripts', 'my_plugin_assets' );

function my_plugin_assets() {
	wp_enqueue_script( 'my-notice-update', plugins_url( '/js/notice-update.js', __FILE__ ), array( 'jquery' ), '1.0', true  );
}

notices.html

<div class="updated notice">
    <p>Something has been updated, awesome</p>
</div>
<div class="error notice">
    <p>There has been an error. Bummer</p>
</div>
<div class="update-nag notice">
    <p>You should really update to achieve some awesome instad of bummer</p>
</div>

remove-option.php

add_action( 'admin_init', 'my_detect_acf' );
function my_detect_acf() {
	if( !function_exists( 'the_field' )) {
		delete_option( 'my-acf-notice-dismissed' );
	}
}

simple-notice.php

function my_error_notice() {
    ?>
    <div class="error notice">
        <p><?php _e( 'There has been an error. Bummer!', 'my_plugin_textdomain' ); ?></p>
    </div>
    <?php
}
add_action( 'admin_notices', 'my_error_notice' );

two-notices.php

function my_error_notice() {
    ?>
    <div class="error notice">
        <p><?php _e( 'There has been an error. Bummer!', 'my_plugin_textdomain' ); ?></p>
    </div>
    <?php
}
add_action( 'admin_notices', 'my_error_notice' );

function my_update_notice() {
    ?>
    <div class="updated notice">
        <p><?php _e( 'The plugin has been updated, excellent!', 'my_plugin_textdomain' ); ?></p>
    </div>
    <?php
}
add_action( 'admin_notices', 'my_update_notice' );

There's a small typo in acf-notice.php line 7, "dismissible"