Tells the delegate the peripheral manager’s state updated.
- iOS 6.0+
- macOS 10.9+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 4.0+
- Core Bluetooth
The peripheral manager whose state has changed.
You implement this required method to ensure that Bluetooth low energy is available to use on the local peripheral device.
Issue commands to the peripheral manager only when the peripheral manager is in the powered-on state, as indicated by the
CBPeripheral constant. A state with a value lower than
CBPeripheral implies that advertising has stopped and that any connected centrals have been disconnected. If the state moves below
CBPeripheral, advertising has stopped you must explicitly restart it. In addition, the powered off state clears the local database; in this case you must explicitly re-add all services. For a complete list and discussion of the possible values representing the state of the peripheral manager, see the
CBPeripheral enumeration in