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ListView: implicit scrolling doesn't work with iOS VoiceOver when shrinkWrap is enabled #79457
Description
Steps to Reproduce
- Run application on an iOS device (I tested on an iPhone 6s, iOS 14.4.1):
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
home: Scaffold(
appBar: AppBar(
title: Text("ListView.builder Accessibility"),
),
body: ListView.builder(
shrinkWrap: true,
itemBuilder: (BuildContext context, int index) {
return Padding(
padding: const EdgeInsets.all(16.0),
child: Text('$index'),
);
},
),
),
);
}
}
- Enable VoiceOver.
- Swipe left repeatedly to cycle accessibility focus through the list children.
Expected results:
The list view should implicitly scroll as necessary, with VoiceOver focusing on the next child as it comes onto the screen. This works as expected on Android.
Actual results:
The list view does not scroll and subsequent list children are not focused.
Details
$ flutter analyze
Analyzing listview_builder_accessibility...
No issues found! (ran in 10.2s)
$ flutter doctor -v
[✓] Flutter (Channel stable, 2.0.3, on Mac OS X 10.15.7 19H524 darwin-x64, locale en-US)
• Flutter version 2.0.3 at /Users/jonathan.joelson/repos/flutter
• Framework revision 4d7946a68d (8 days ago), 2021-03-18 17:24:33 -0700
• Engine revision 3459eb2436
• Dart version 2.12.2
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at /Users/jonathan.joelson/Library/Android/sdk
• Platform android-30, build-tools 30.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.4, Build version 12D4e
• CocoaPods version 1.10.1
[✗] Chrome - develop for the web (Cannot find Chrome executable at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
[✓] VS Code (version 1.54.3)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.20.0
[✓] Connected device (3 available)
• Pixel 4a (mobile) • 0B201JEC221560 • android-arm64 • Android 11 (API 30)
• Jonathan Joelson’s iPhone (mobile) • 5adff574a1e6e01ea07fbce2fbfd86e78dd84167 • ios • iOS 14.4.1
• iPhone 12 Pro (mobile) • 6466B0CE-0126-49BE-886F-4376707E20C9 • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-4
(simulator)
! Doctor found issues in 1 category.
Reacted by David Lawson
Activity
darshankawar commentedon Apr 1, 2021
Accessibility reads the last item visible on screen but then swiping left, doesn't scroll to next item and reads item 12 (for example) everytime upon swiping.
flutter doctor -v
goderbauer commentedon Apr 7, 2021
/cc @chunhtai
kmemo commentedon May 31, 2023
Hi, with the default settings of iOS's VoiceOver, I believe that 3-finger vertical scroll should scroll the screen.
However, I also beleve that Flutter's ListView can not be scrolled vertically in this way.