evaluatedPolicyDomainState

This property returns a value only when the canEvaluatePolicy(_:error:) method succeeds for a biometric policy or the evaluatePolicy(_:localizedReason:reply:) method is called and a successful biometric authentication is performed. Otherwise, nil is returned.

The returned data is an opaque structure. It can be used to compare with other values returned by this property to determine whether the authorized database has been updated. However, the nature of the change cannot be determined from this data.