Layout on the iOS profile and release mode happens with zero max size first and then the actual max size. #149974
Description
Steps to reproduce
- Run the code sample on an iOS device in debug mode - layout happens once with the actual max size
- Run the code sample on an iOS device in profile/release mode - layout happens twice (with zero max size first and then the actual max size)
Expected results
Layout happens once with the actual max size.
Actual results
Layout happens twice: zero max size first and then the actual max size.
Code sample
Code sample 1
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return Flow(
delegate: const MyFlowDelegate(),
children: const [],
);
}
}
class MyFlowDelegate extends FlowDelegate {
const MyFlowDelegate();
@override
Size getSize(BoxConstraints constraints) {
final maxSize = constraints.biggest;
print('LAYOUT');
print('Max width: ${maxSize.width}');
print('Max height: ${maxSize.height}');
return constraints.biggest;
}
@override
void paintChildren(FlowPaintingContext context) {}
@override
bool shouldRepaint(MyFlowDelegate oldDelegate) {
return false;
}
}
Code sample 2
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (context, constraints) {
final maxSize = constraints.biggest;
print('LAYOUT');
print('Max width: ${maxSize.width}');
print('Max height: ${maxSize.height}');
return const SizedBox.shrink();
},
);
}
}
Screenshots or Video
Screenshots / Video demonstration
[Upload media here]
Logs
iOS debug logs
Launching lib/main.dart on Kostiantyn’s iPhone in debug mode...
Xcode build done. 8.0s
flutter: LAYOUT
flutter: Max width: 375.0
flutter: Max height: 812.0iOS profile logs
Launching lib/main.dart on Kostiantyn’s iPhone in profile mode...
Xcode build done. 10.6s
flutter: LAYOUT
flutter: Max width: 0.0
flutter: Max height: 0.0
flutter: LAYOUT
flutter: Max width: 375.0
flutter: Max height: 812.0iOS release logs
Launching lib/main.dart on Kostiantyn’s iPhone in release mode...
Xcode build done. 11.2s
flutter: LAYOUT
flutter: Max width: 0.0
flutter: Max height: 0.0
flutter: LAYOUT
flutter: Max width: 375.0
flutter: Max height: 812.0Android debug logs
Launching lib/main.dart on SM A305FN in debug mode...
✓ Built build/app/outputs/flutter-apk/app-debug.apk
Connecting to VM Service at ws://127.0.0.1:53486/QKI8BVXu2KA=/ws
I/flutter (21798): LAYOUT
I/flutter (21798): Max width: 411.42857142857144
I/flutter (21798): Max height: 843.4285714285714Android release logs
Launching lib/main.dart on SM A305FN in release mode...
✓ Built build/app/outputs/flutter-apk/app-release.apk (6.5MB)
I/flutter (21797): LAYOUT
I/flutter (21797): Max width: 411.42857142857144
I/flutter (21797): Max height: 843.4285714285714macOS debug logs
Launching lib/main.dart on macOS in debug mode...
✓ Built build/macos/Build/Products/Debug/ios_layout_bug.app
flutter: LAYOUT
flutter: Max width: 800.0
flutter: Max height: 600.0macOS release logs
Launching lib/main.dart on macOS in release mode...
✓ Built build/macos/Build/Products/Release/ios_layout_bug.app (44.0MB)
flutter: LAYOUT
flutter: Max width: 800.0
flutter: Max height: 600.0Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.22.2, on macOS 14.1 23B2073 darwin-arm64, locale en-US)
• Flutter version 3.22.2 on channel stable at /Users/ksokolovskyi/development/flutter
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• Android SDK at /Users/ksokolovskyi/Library/Android/sdk
• Platform android-34, build-tools 34.0.0
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• Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
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• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 15F31d
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[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2022.3)
• Android Studio at /Applications/Android Studio.app/Contents
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• Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
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• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.90.0