Flutter widget.snapshot.data 与 snapshot.data

Question

I'm confused about widget.snapshot.data["info"] and snapshot.data["info"]. Can anyone explain me this.

Answer 1

widget.snapshot.data["info"] should be used when a StatefulWidget is used and the snapshot is from the StatefulWidget

Example

class ViewDocuments extends StatefulWidget {
  DocumentSnapshot snapshot;

  ViewDocuments(this.snapshot);

  @override
  _ViewDocumentsState createState() => _ViewDocumentsState();
}

class _ViewDocumentsState extends State<ViewDocuments> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text("${widget.snapshot.data["info"]}"),
      ),
    );
  }
}

Basically you use widget.--- to access fields in a StatefulWidget class State, it is a way for a StatefulWidget and its State to communicate

For snapshot.data["info"] , it should be used in StatelessWidget since it doesn't have a State

For Example

class ViewDocuments extends StatelessWidget {
  DocumentSnapshot snapshot;

  ViewDocuments(this.snapshot);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Text("${snapshot.data["info"]}"),
      ),
    );
  }
}

I hope this helps you.