Repository: flutter
Issue: [a11y][iOS] bottomNavigationBar cannot be navigated using Switch Control
Labels: platform-ios,f: material design,a: accessibility,customer: google,f: focus,has reproducible steps,P1,found in release: 3.24,team-accessibility,triaged-accessibility,found in release: 3.27

### Steps to reproduce

1. Enable Switch Control in iOS settings app (https://support.apple.com/en-us/119835).
2. Using the repro app below, attempt to navigate between `NavigationDestination`s within the `NavigationBar`.

### Expected results

It is possible to navigate between `NavigationDestination` tabs.

### Actual results

Focus seems to be stuck on a single `NavigationDestination` tab.

### Code sample

<details open><summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(useMaterial3: false),
      title: 'Flutter Demo',
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  int _selectedIndex = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  void _changeIndex(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title, style: TextStyle(fontFamily: 'ProductSans')),
      ),
      body: Center(
        child: Column(
          children: [
            Text(
              'Button tapped $_counter time${_counter == 1 ? '' : 's'}.',
              // This optional key is used to uniquely identify this widget in
              // the integration test at: test_driver/tap_test.dart.
              key: Key('CountText'),
              style: TextStyle(fontSize: 24),
            ),
            MaterialButton(
              onPressed: () {
                print('Button tapped');
              },
              color: Colors.blue,
              child: Text('Test button 1'),
            ),
            MaterialButton(
              onPressed: () {
                print('Button tapped');
              },
              color: Colors.blue,
              child: Text('Test button 2'),
            ),
            MaterialButton(
              onPressed: () {
                print('Button tapped');
              },
              color: Colors.blue,
              child: Text('Test button 3'),
            ),
          ],
        ),
      ),
      bottomNavigationBar: NavigationBar(
        onDestinationSelected: (index) {
          print('Selected destination $index');
          _incrementCounter();
          _changeIndex(index);
        },
        selectedIndex: _selectedIndex,
        destinations: [
          NavigationDestination(label: 'one', icon: Icon(Icons.home)),
          NavigationDestination(label: 'two', icon: Icon(Icons.home)),
          NavigationDestination(label: 'three', icon: Icon(Icons.home)),
        ],
      ),
    );
  }
}

```

</details>


### Screenshots or Video

<details open>
<summary>Video demonstration</summary>

https://github.com/user-attachments/assets/7e246174-37fd-4d5b-a8be-d21c4e9a449b

</details>


### Logs

_No response_

### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[✓] Flutter (Channel google3)
    • Framework revision 1d60fc7843 (2 days ago), 2024-12-08T00:00:00.000
    • Engine revision 82d7c1b2c2
    • Dart version c7e47c6c5d

[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
    • Xcode at /Applications/Xcode_16.0.0.app/Contents/Developer
    • Build 16A242d
```

</details>

Google bug tracker: b/382363824.