Tells the delegate that the drag state of one of its annotation views changed.
- iOS 4.0+
- macOS 10.9+
The map view containing the annotation view.
The annotation view whose drag state changed.
The new drag state of the annotation view.
The previous drag state of the annotation view.
The drag state typically changes in response to user interactions with the annotation view. However, the annotation view itself is responsible for changing that state as well.