Mangento2: add custom validation to the UI Form Field

Here are the steps to add a custom validation to the UI Form field:

1. Add the following code to your field in xml file:
   
   <item name="validation" xsi:type="array">
       <item name="custom_auth_validation" xsi:type="boolean">true</item>
   </item>

2.  Then add the following code to your js while which is loading on that page:

   validator.addRule(

           'custom_validation',

           function (value) {

               if (jQuery( "input[name='authorization_required']" ).val() == 1 

                   && jQuery( "input[name='auth_code']" ).val() == "") {

                   return false;

               }

               return true;

           }

           ,$.mage.__('Custom validation message...')

       );