farmer_client/lib/pages/launch.dart

import 'package:flutter/widgets.dart';

class Launch extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => LaunchState();
}

class LaunchState extends State<Launch> {

  // 默认 3s
  int _countdown = 3;

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    throw UnimplementedError();
  }

}