Controller

class _HomeScreenState extends State<HomeScreen> {
	GoogleMapController? mapController;                  // 3

	@override
	Widget build(BuildContext context) {
		return Column(
			body: _CustomGoogleMap(
        onMapCreated: onMapCreated,                    // 5
      ),
		)
	}
}

onMapCreated(GoogleMapController controller) {         // 4
    mapController = controller;
Se}

// stless widget
class _CustomGoogleMap extends StatelessWidget {
  final MapCreatedCallback onMapCreated;               // 2

	const _CustomGoogleMap({
    required this.onMapCreated,                        // 2
    Key? key,
  }) : super(key: key);

	@override
  Widget build(BuildContext context) {
    return GoogleMap(
			onMapCreated: onMapCreated,                      // 1
		)
	}
}
	
Dart
복사

recieve controller as a parameter

define the controller by its type

define the contoller on state // to manage variables from state

recieve the controller and pass it to the no.3

use it on the variable