Run loop activity stages in which run loop observers can be scheduled.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
static var afterWaiting: CFRunLoopActivity
Inside the event processing loop after the run loop wakes up, but before processing the event that woke it up. This activity occurs only if the run loop did in fact go to sleep during the current loop.
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