Deprecated NSKeyValueObserving Methods

A method identified as deprecated has been superseded and may become unsupported in the future.

Deprecated in OS X v10.5 and later


Configures the receiver to post change notifications for a given property if any of the properties specified in a given array changes. (Deprecated in OS X v10.5 and later. You should use the method keyPathsForValuesAffectingValueForKey: instead.)

+ (void)setKeys:(NSArray *)keys triggerChangeNotificationsForDependentKey:(NSString *)dependentKey

The names of the properties upon which the value of the property identified by dependentKey depends.


The name of a property whose value depends on the properties specified by keys.


Invocations of will- and did-change KVO notification methods for any key in keys will automatically invoke the corresponding change notification methods for dependentKey. The receiver will not receive willChange/didChange messages to generate the notifications.

Dependencies should be registered before any instances of the receiving class are created, so you typically invoke this method in a class's initialize method, as illustrated in the following example.

+ (void)initialize
    [self setKeys:[NSArray arrayWithObjects:@"firstName", @"lastName", nil]
  • Deprecated in OS X v10.5 and later.
Declared In