userInfo
A dictionary of arbitrary values for the receiver.
Declaration
var userInfo: [ProgressUserInfoKey : Any] { get }Discussion
A KVO-compliant dictionary that changes in response to setUserInfoObject(_:forKey:). The dictionary sends all of its KVO notifications on the thread that updates the property.
Some entries have meanings that the NSProgress class recognizes. For more information, see Recognizing Kinds of Progress, Using General Keys, Using File Operation Keys, and Recognizing Kinds of File Operations.