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