Tells the delegate that the specified view was unable to load the map data.
- iOS 3.0+
- macOS 10.9+
- tvOS 9.2+
The map view that started the load operation.
The reason that the map data could not be loaded.
This method might be called in situations where the device does not have access to the network or is unable to load the map data for some reason. It may also be called if a request for additional map tiles comes in while a previous request for tiles is still pending. You can use this message to notify the user that the map data is unavailable.