flutter_global_variable_page3.dart

import 'package:flutter/material.dart';
import 'package:scoped_model/scoped_model.dart';
import 'package:flutter_global_variable/scoped_models/main.dart';

class Page3 extends StatelessWidget {
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
          title: Text("Page 3"),
          backgroundColor: Colors.transparent,
          elevation: 0.0),
      body: ScopedModelDescendant<MainModel>(
          builder: (BuildContext context, Widget child, MainModel model) {
        return Center(
          child: Text(
            '${model.count}',
            style: TextStyle(fontSize: 80.0),
          ),
        );
      }),
    );
  }
}