NSFileHandleDataAvailable
Posted when the file handle determines that data is currently available for reading in a file or at a communications channel.
Declaration
static let NSFileHandleDataAvailable: NSNotification.NameDiscussion
The observers can then issue the appropriate messages to begin reading the data. To cause the posting of this notification, you must send either waitForDataInBackgroundAndNotify() or waitForDataInBackgroundAndNotify(forModes:) to an appropriate NSFileHandle object.
The notification object is the NSFileHandle object that sent the notification. This notification doesn’t contain a userInfo dictionary.