The type of data displayed by the map view.
- iOS 3.0+
- macOS 10.9+
- tvOS 9.2+
Changing the value in this property may cause the receiver to begin loading new map content. For example, changing from
satellite might cause it to begin loading the satellite imagery needed for the map. If new data is needed, however, it is loaded asynchronously and appropriate messages are sent to the receiver’s delegate indicating the status of the operation.