The resource’s unique identifier, returned as an
- iOS 5.0+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
This identifier can be used to determine equality between file system resources with the
is method. Two resources are equal if they have the same file-system path or if their paths link to the same inode on the same file system.
The value of this identifier is not persistent across system restarts.