Returns the current activity identifier.
- iOS 10.0+
- macOS 10.12+
- Mac Catalyst 13.0+Beta
- tvOS 10.0+
- watchOS 3.0+
The activity to be identified.
On return, contains the identifier of the parent of the returned activity, if any.
The current activity identifier.
Creating and Accessing Activities
Ends the specified activity on the current thread.
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