타깃-액션 프로그래밍 디자인 패턴.
Cocoa uses the target-action mechanism for communication between a control and another object
참고 링크 : https://developer.apple.com/library/archive/documentation/General/Conceptual/CocoaEncyclopedia/Target-Action/Target-Action.html
관련 강좌
– Action과 Outlet
