A string identifying the kind of progress being made.
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
This property identifies the kind of progress being made, such as
file. It can be
If the value of the
localized property has not previously been set to a non-nil value, the default
localized getter uses the progress kind to determine how to use the values of other properties, as well as values in the user info dictionary, to create a string that is presentable to the user.