readAttributeBarrierOpenPeriod(completionHandler:)
Declaration
func readAttributeBarrierOpenPeriod(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributeBarrierOpenPeriod() async throws -> NSNumberfunc readAttributeBarrierOpenPeriod(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)func readAttributeBarrierOpenPeriod() async throws -> NSNumber