A Boolean set to true when a request can't determine its progress in fractions completed.
- iOS 13.0+
- macOS 10.15+
- Mac Catalyst 13.0+
- tvOS 13.0+
A value of
YES doesn't mean that the request will run forever. Rather, it means that the nature of the request can't be broken down into identifiable fractions to report. The
progress will still be called at suitable intervals.