UIApplication : a singleton object, initial routing of incoming user events UIResponder : Event Handler, touch/motion (shaking) events AppDelegate : respond to application launch and termination UIWindow : provide an area for displaying its view, distribute events to the views
Application 몸통 Interface Builder 에서 Window 의 Visual 속성 변화 하거나 , Control 추가해도 변화 없다 .
UIApplication : a singleton object, initial routing of incoming user events UIResponder : Event Handler, touch/motion (shaking) events AppDelegate : respond to application launch and termination UIWindow : provide an area for displaying its view, distribute events to the views