Tells the delegate about the state of the specified region.
- iOS 7.0+
- macOS 10.10+
- Core Location
The location manager object reporting the event.
The state of the specified region. For a list of possible values, see the
The region whose state was determined.
The location manager calls this method whenever there is a boundary transition for a region. It calls this method in addition to calling the
location methods. The location manager also calls this method in response to a call to its
request method, which runs asynchronously.