NSProgress instance, if any, associated with the current thread by a previous invocation of
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
NSProgress instance associated with the current thread, if any.
Use this per-thread
current value to allow code that performs work to report useful progress even when it is widely separated from the code that actually presents progress information to the user, without requiring layers of intervening code to pass around an
When reporting progress, you typically work with a child progress object, created by calling
discrete, to ensure that you report progress in known units of work.