load Map View
Links MapView to map data when loaded.
Notes
This method must be called at least once in order for the map to be viewed.
Notes
If the map data is already loaded, then map view will be displayed immediately.
Notes
If the map data is not already loaded, then VMEMapController will keep a reference of this View, and map will be displayed as soon as map data is loaded.
Since
2.0
Parameters
map View
: the VMEMapView which will display map