[IOS]No Hero animation with SnackBar on drag to pop gesture #100782
Description
Steps to Reproduce
On iOS, while using the drag to pop gesture, the SnackBar appears on both Scaffold during the transition.
- Execute
flutter runon the code sample, on an iOS device (or simulator) - Click on the PageTwo button
- Click on the Show SnackBar button
- Use the drag to pop gesture while the
SnackBaris still displayed
Expected results:
snackbar_hero_ok.mp4
Actual results:
snackbar_hero_ko.mp4
We can fix it by adding transitionOnUserGestures: true, to the Hero created by the SnackBar, but I don't know if we should set true by default or not.
If we always want this behavior, we can simply set the Hero like that:
return Hero(
tag: '<SnackBar Hero tag - ${widget.content}>',
transitionOnUserGestures: true,
child: snackBarTransition,
);Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: PageOne(),
);
}
}
class PageOne extends StatelessWidget {
const PageOne({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: ElevatedButton(
child: const Text('Page Two'),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => const PageTwo(),
),
);
},
),
),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.add),
onPressed: () {},
),
);
}
}
class PageTwo extends StatelessWidget {
const PageTwo({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
body: Builder(builder: (context) {
return Center(
child: ElevatedButton(
child: const Text('Show SnackBar'),
onPressed: () {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('SnackBar!'),
behavior: SnackBarBehavior.floating,
),
);
},
),
);
}),
);
}
}Logs
[✓] Flutter (Channel stable, 2.10.2, on macOS 12.2.1 21D62 darwin-arm, locale fr-FR)
• Flutter version 2.10.2 at /Users/romain.rastel/dev/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 097d3313d8 (il y a 5 semaines), 2022-02-18 19:33:08 -0600
• Engine revision a83ed0e5e3
• Dart version 2.16.1
• DevTools version 2.9.2
[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
• Android SDK at /Users/romain.rastel/Library/Android/sdk
• Platform android-32, build-tools 32.1.0-rc1
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• CocoaPods version 1.11.3
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2021.1)
• 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 11.0.11+0-b60-7772763)
[✓] VS Code (version 1.64.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.36.0
[✓] Connected device (3 available)
• iPhone (mobile) • 00008030-000139323E86402E • ios • iOS 14.8.1 18H107
• iPhone 13 (mobile) • 7F4ADD7F-5E90-4286-8263-68F02BBF524B • ios • com.apple.CoreSimulator.SimRuntime.iOS-15-2 (simulator)
• Chrome (web) • chrome • web-javascript • Google Chrome 99.0.4844.83
[✓] HTTP Host Availability
• All required HTTP hosts are available
• No issues found!