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