Key-Value Observing (KVO) is heavily used in OS X development in bindings and form a significant portion of UI design. However, with iOS, it takes on somewhat less significance and is mostly used as necessary to simplify program design. KVO "broadcasts" a notification whenever a property is modified, and any class can receive those notifications and handle changes as necessary. This helps to decouple your classes from each other, allowing more flexible and re-usable code, especially as your code grows large and you have many sets of MVC objects.


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