The filename of the file wrapper object
- iOS 4.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
This property contains the file wrapper’s filename, or
nil when the file wrapper has no corresponding file-system node.
The filename is used for record-keeping purposes only and is set automatically when the file wrapper is created from the file system using
init(url: and when it’s saved to the file system using
write(to: (although this method allows you to request that the filename not be updated).
The filename is usually the same as the preferred filename, but might instead be a name derived from the preferred filename. You can use this method to get the name of a child that's just been read. Don’t use this method to get the name of a child that's about to be written, because the name might be about to change; send
key to the parent instead.