Key-Value Observing (KVO) is a mechanism that allows objects to be notified of changes to specified properties of other objects. KVO is provided through an informal NSKeyValueObserving protocol. KVO works in a way the target-action design pattern does but it is not limited to controls. KVO allows you to observe any object properties including simple attributes, to-one relationships, and to-many relationships. Observers of to-many relationships are informed of the type of change made, as well as which objects are involved in the change. In order to understand key-value observing, you must first understand Key-Value Coding (KVC).


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