A set of methods that defines the communication method for state updates from accessories to their delegates.
- iOS 8.0+
- tvOS 10.0+
- watchOS 2.0+
Set a delegate on an accessory and implement methods in this protocol for updates you’re interested in observing to keep your app’s UI in sync with changes to HomeKit’s internal state.
HomeKit invokes delegate methods to notify your app of changes to the state of the home network. In general, if your app invokes a HomeKit method with a completion handler parameter and the method is successful, the associated delegate message is sent to other HomeKit apps running on the same or remote iOS devices. If your app initiates the change, the delegate message is not sent to your app, so you should add code to both the completion handler and the associated delegate method to reload data and update views as needed. To learn more about how HomeKit uses the delegation design pattern, read About HomeKit Delegation Methods.