A gist showing how to conditionally load aui assets

ayecode-ui-loader.php

<?php

/**
 * Add the function that calls the class.
 */
if(!function_exists('aui')){
	function aui(){
    global $aui_load_assets;
   
		if(!class_exists("AUI",false)){
			return false;
		}
    
    $aui_load_assets = true;
  
		return AUI::instance();
	}
}

ayecode-ui-settings.php

<?php

...
  
 // Plugins can hook here to force aui to load assets on their pages.
 if ( apply_filters( 'aui_load_assets', false ) {
  
      /**
       * Maybe load CSS
       *
       * We load super early in case there is a theme version that might change the colors
       */
       if ( $this->settings['css'] ) {
	   add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_style' ), 1 );
       }
  
       if ( $this->settings['css_backend'] && $this->load_admin_scripts() ) {
	   add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_style' ), 1 );
       }
  
 } else {
   
      // Plugins did not force scripts to load here.
      // Let us load the scripts in case aui() was called.

      if ( $this->settings['css'] ) {
          add_action( 'wp_footer', array( $this, 'maybe_enqueue_style' ), 1 );
      }
  
      if ( $this->settings['css_backend'] && $this->load_admin_scripts() ) {
	 add_action( 'admin_footer', array( $this, 'maybe_enqueue_style' ), 1 );
      }
 }
     
 ...
     
  /*
   * Adds the styles.
   */
   public function maybe_enqueue_style() {
       global $aui_load_assets;
    
       if ( ! empty( $aui_load_assets ) ) {
           $this->enqueue_style();
       }
  }
  
 ...