CupertinoSliverNavigationBar's collapse animation can get stuck in an infinite loop #164458
Description
Steps to reproduce
-
Create a Cupertino app with a
CupertinoSliverNavigationBarwhere the scrollable content extends past the viewport only ifCupertinoSliverNavigationBaris expanded, but fits within the viewport ifCupertinoSliverNavigationBaris collapsed. -
Scroll down to the bottom.
Expected results
The CupertinoSliverNavigationBar should collapse and stay collapsed.
Actual results
The CupertinoSliverNavigationBar loops between its collapsed and expanded mode forever.
Code sample
Code sample
import 'package:flutter/cupertino.dart';
void main() {
runApp(
CupertinoApp(
home: CupertinoPageScaffold(
child: CustomScrollView(
slivers: [
CupertinoSliverNavigationBar(
largeTitle: Text('Hello World!'),
),
SliverList.builder(
// TODO: Edit the item count such that the list
// extends past the viewport when the navigation
// bar is expanded, but fits in the viewport when
// the navigation bar is collapsed
itemCount: 14,
itemBuilder: (context, index) {
return CupertinoListTile(
title: Text('Item $index'),
);
},
),
],
),
),
),
);
}
Screenshots or Video
Screenshots / Video demonstration
Logs
N/A
Flutter Doctor output
Doctor output
[✓] Flutter (Channel master, 3.29.0-1.0.pre.184, on Microsoft Windows [Version 10.0.26100.3194], locale en-US) [1,986ms]
• Flutter version 3.29.0-1.0.pre.184 on channel master at C:\Code\f\flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 4d8585d936 (4 weeks ago), 2025-01-30 15:30:45 -0800
• Engine revision 4d8585d936
• Dart version 3.8.0 (build 3.8.0-24.0.dev)
• DevTools version 2.42.0
[✓] Windows Version (11 Pro 64-bit, 24H2, 2009) [1,839ms]
[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1) [1,298ms]
• Android SDK at C:\Users\sharm\AppData\Local\Android\sdk
• Platform android-33, build-tools 32.1.0-rc1
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
This is the JDK bundled with the latest Android Studio installation on this machine.
To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment (build 11.0.12+7-b1504.28-7817840)
• All Android licenses accepted.
[✓] Chrome - develop for the web [73ms]
• Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe
[✓] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.7.2) [72ms]
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.7.34018.315
• Windows 10 SDK version 10.0.22621.0
[✓] Android Studio (version 2021.2) [17ms]
• Android Studio at C:\Program Files\Android\Android Studio
• 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
• android-studio-dir = C:\Program Files\Android\Android Studio
• Java version OpenJDK Runtime Environment (build 11.0.12+7-b1504.28-7817840)
[✓] VS Code (version 1.97.2) [15ms]
• VS Code at C:\Users\sharm\AppData\Local\Programs\Microsoft VS Code
• Flutter extension version 3.104.0
[✓] Connected device (3 available) [169ms]
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.26100.3194]
• Chrome (web) • chrome • web-javascript • Google Chrome 130.0.6723.70
• Edge (web) • edge • web-javascript • Microsoft Edge 133.0.3065.92
[✓] Network resources [516ms]
• All expected network resources are available.
• No issues found!