This example connects a nib file (as generated by Apple's Interface Builder) to a Lisp implementation of an Objective-C class which acts as the MVC controller:
(example-edit-file "objc/area-calculator/area-calculator")
Use this script to build it as a standalone Cocoa application:
(example-edit-file "objc/area-calculator/deliver")
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 21 Mar 2017