main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();

    imageCache.maximumSizeBytes = 0;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            OutlineButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(
                    builder: (context) => SecondPage(
                      depth: 1,
                    ),
                  ),
                );
              },
              child: Text('Push Second Page'),
            ),
          ],
        ),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  SecondPage({
    @required this.depth,
  }) : assert(depth != null);

  final int depth;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Image.network('https://picsum.photos/id/$depth/200/200'),
            OutlineButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(
                    builder: (context) => SecondPage(
                      depth: depth + 1,
                    ),
                  ),
                );
              },
              child: Text('Push another Second page'),
            ),
            OutlineButton(
              onPressed: () {
                Navigator.pop(context);
              },
              child: Text('POP'),
            ),
            OutlineButton(
              onPressed: () {
                Navigator.popUntil(
                  context,
                  (route) => route.isFirst,
                );
              },
              child: Text('Pop To Home'),
            ),
          ],
        ),
      ),
    );
  }
}