init method
/// Initializes the platform interface with id
.
This method is called when the plugin is first initialized.
Implementation
@override
Future<void> init(int mapId) async {
// The internal instance of our controller is initialized eagerly in `buildView`,
// so we don't have to do anything in this method, which is left intentionally
// blank.
assert(_mapById[mapId] != null, 'Must call buildWidget before init!');
}