didStartGathering
An identifier for a message about a metadata query that is starting its initial result gathering.
Declaration
static var didStartGathering: NotificationCenter.BaseMessageIdentifier<NSMetadataQuery.DidStartGatheringMessage> { get }Discussion
Use this identifier with NotificationCenter’s addObserver(of:for:using:) or messages(of:for:bufferSize:) methods to observe messages of type NSMetadataQuery.DidStartGatheringMessage.