# NSKeyValueObservingCustomization Conforming to NSKeyValueObservingCustomization is not required to use Key-Value Observing. Provide an implementation of these functions if you need to disable auto-notifying for a key, or add dependent keys ``` protocol NSKeyValueObservingCustomization : NSObjectProtocol ``` ## Topics ### Type Methods [`static func automaticallyNotifiesObservers(for: AnyKeyPath) -> Bool`](/documentation/Foundation/NSKeyValueObservingCustomization/automaticallyNotifiesObservers(for:)) [`static func keyPathsAffectingValue(for: AnyKeyPath) -> Set`](/documentation/Foundation/NSKeyValueObservingCustomization/keyPathsAffectingValue(for:)) ## Relationships ### Inherits From [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)