Flutter onClosing callback for showModalBottomSheet

Question

I have a showModalBottomSheet like the below, which I understand to inherit from BottomSheet (right?)

      showModalBottomSheet

        

Answer 1

showBottomSheet does not return a future, now it returns a PersistentBottomSheetController

  var _scaffoldKey = GlobalKey<ScaffoldState>();
  PersistentBottomSheetController persistentBottomSheetController;

 persistentBottomSheetController = _scaffoldKey.currentState.showBottomSheet<void>(
    (context)=>Container(

    )
 );

 persistentBottomSheetController.closed.then(_closeModal);

  void _closeModal(void value) {
    print('modal closed');
  }

Answer 2

Perhaps it's not the best solution, but showModalBottomSheet return a "Future" so you can used it.

For example:

void _showModal() {
    Future<void> future = showModalBottomSheet<void>(
      context: context,
      builder: (BuildContext context) {
        return Container(height: 260.0, child: Text('I am text'));
      },
    );
    future.then((void value) => _closeModal(value));
}
void _closeModal(void value) {
    print('modal closed');
}