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peripheral(_:didUpdateValueFor:error:)

Tells the delegate that retrieving the specified characteristic’s value succeeded, or that the characteristic’s value changed.

Declaration

optional func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: (any Error)?)

Parameters

  • peripheral:

    The peripheral providing this information.

  • characteristic:

    The characteristic containing the value.

  • error:

    The reason the call failed, or nil if no error occurred.

Discussion

Core Bluetooth invokes this method when your app calls the readValue(for:) method. A peripheral also invokes this method to notify your app of a change to the value of the characteristic for which the app previously enabled notifications by calling setNotifyValue(_:for:). If successful, the error parameter is nil. If unsuccessful, the error parameter returns the cause of the failure.

See Also

Retrieving Characteristic and Descriptor Values