NavBar

sample.packages.flutter.lib.src.cupertino.nav_bar.227.

This example shows a [CupertinoNavigationBar] placed in a [CupertinoPageScaffold]. Since [backgroundColor]'s opacity is not 1.0, there is a blur effect and content slides underneath.

  
import 'package:flutter/cupertino.dart';

void main() => runApp(const MyApp());

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

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return const CupertinoApp(
      title: _title,
      home: MyStatefulWidget(),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State {
  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(
        // Try removing opacity to observe the lack of a blur effect and of sliding content.
        backgroundColor: CupertinoColors.systemGrey.withOpacity(0.5),
        middle: const Text('Sample Code'),
      ),
      child: Column(
        children: [
          Container(height: 50, color: CupertinoColors.systemRed),
          Container(height: 50, color: CupertinoColors.systemGreen),
          Container(height: 50, color: CupertinoColors.systemBlue),
          Container(height: 50, color: CupertinoColors.systemYellow),
        ],
      ),
    );
  }
}