cupertino equivalent of `Material`

Question

I've conducted a long research on the internet about this (what I think is mischievous) use of Material widget in flutter, Any flutter developer faced the No Material widget found. exception even when using cupertino design widgets.

A simple example to produce is

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class Example extends StatelessWidget {
  const Example({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(
        middle: Text('Example'),
        leading: IconButton(
          onPressed: () {},
          icon: Icon(
            Icons.close,
            color: Colors.black54,
          ),
        ),
      ),
      child: Center(
        child: IconButton(
          onPressed: () {},
          icon: Icon(
            Icons.close,
            color: Colors.black54,
          ),
        ),
      ),
    );
  }
}

Neither the navigationBar nor the body IconButton will work resulting in the same exception.

When facing this exception I always wrap it inside a Material to bypass it, but I think am doing it wrong.IconButton is not the only widget and I've searched a lot with no avail.

Please tell me what am I missing ? and thanks in advance.

Answer 1

You need to wrap your root Widget in MaterialApp() so that you can access Material components.

For example,

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}