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Registering for Key-Value Observing

In order to receive key-value observing notifications for a property, three things are required:

• The observed class must be key-value observing compliant for the property that you wish to observe.
• You must register the observing object with the observed object, using the method addObserver:forKeyPath:options:context:.
• The observing class must implement observeValueForKeyPath:ofObject:change:context:.

Important: Not all classes are KVO-compliant for all properties. You can ensure your own classes are KVO-compliant by following the steps described in KVO Compliance. Typically properties in Apple-supplied frameworks are only KVO-compliant if they are documented as such.