Extend drawing and rendering in lifecycles in iOS #71051
Description
Use case
To keep it short, applications built with flutter do not continue to render whilst out of view or in IOS's app switcher.
This is a bad behaviour from mobile apps imo . Might be a limitation from the framework, not sure.
It also causes an unpleasant UI/UX when scrolling through a ListView and the the application is removed from view. When
the application is brought back into view it jumps suddenly depending on the scroll extent.
Here is a gif description comparing Instagram and a mock flutter application.
Proposal
According to #5449 and #11421 , this was fixed. Although this was as far back 2017/2018 and Flutter has had many updates since then. Maybe a revision of what was changed could be implemented once more.
Environment
A minimal code snippet that would reproduce this issue.
import 'package:flutter/material.dart';
void main() {
runApp(App());
}
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Issue(),
);
}
}
class Issue extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Issue'),
),
body: ListView.builder(
itemBuilder: (context, index) {
return Padding(
padding: const EdgeInsets.all(16.0),
child: Text('Issue test'),
);
},
itemCount: 350,
),
);
}
}
flutter doctor -v
[✓] Flutter (Channel stable, 1.22.0, on Mac OS X 10.15.7 19H15, locale en-GB)
• Flutter version 1.22.0 at /Users/adeola/Downloads/flutter
• Framework revision d408d302e2 (8 weeks ago), 2020-09-29 11:49:17 -0700
• Engine revision 5babba6c4d
• Dart version 2.10.0
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
• Android SDK at /Users/adeola/Library/Android/sdk
• Platform android-30, build-tools 30.0.2
• 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-b3-6222593)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.0.1, Build version 12A7300
• CocoaPods version 1.10.0.rc.1
[!] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio.app/Contents
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
[✓] VS Code (version 1.51.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.16.0
[✓] Connected device (1 available)
• iPhone (mobile) • 7301a50cae9aaf2e903ef313e632bfed64bb3704 • ios • iOS 14.0