RenderUiKitView _handleGlobalPointerEvent is not checking for null size

[yasargil]

Steps to Reproduce

Sadly i have no working reproducer. Only Error reports in crashlytics.

In this function the size of the render box is used without checking if it is null:

flutter/packages/flutter/lib/src/rendering/platform_view.dart

Line 382 in 1cf492f

if (!(Offset.zero & size).contains(globalToLocal(event.position))) {

It looks like there is a way for RenderUiKitView to receiver touch events bevor it is layouted and the size is still null:

flutter/packages/flutter/lib/src/rendering/box.dart

Line 1951 in e905dd2

return _size!;

Expected results:
No error Report generated.

Actual results:

Non-fatal Exception: FlutterError
Null check operator used on a null value. Error thrown Instance of 'ErrorDescription'
0  ???                            0x0 size + 1952 (box.dart:1952)
1  ???                            0x0 _handleGlobalPointerEvent + 382 (platform_view.dart:382)
2  ???                            0x0 _dispatch + 93 (pointer_router.dart:93)
3  ???                            0x0 _dispatchEventToRoutes.<fn> + 138 (pointer_router.dart:138)
4  ???                            0x0 forEach (dart:collection)
5  ???                            0x0 _dispatchEventToRoutes + 136 (pointer_router.dart:136)
6  ???                            0x0 route + 128 (pointer_router.dart:128)
7  ???                            0x0 handleEvent + 439 (binding.dart:439)
8  ???                            0x0 dispatchEvent + 419 (binding.dart:419)
9  ???                            0x0 dispatchEvent + 287 (binding.dart:287)
10 ???                            0x0 _handlePointerEventImmediately + 374 (binding.dart:374)
11 ???                            0x0 handlePointerEvent + 338 (binding.dart:338)
12 ???                            0x0 _flushPointerEventQueue + 296 (binding.dart:296)
13 ???                            0x0 _handlePointerDataPacket + 279 (binding.dart:279)

[yasargil]

@cyanglaz @goderbauer @Hixie pinging you three because of commit history in both methods.

[Hixie]

If it's not been laid out, it's not clear how it can get events, since (if you use widgets) the render object should be created then laid out all synchronously and there's no way to handle events while that's happening...

[TahaTesser]

Hi @yasargil
Can you please provide your flutter doctor -v?
Thank you

[yasargil]

@Hixie
Thank you. So my assumption was wrong, do you see/know any other reason why the size would be null. We only use GoogleMaps as native view in our app.

@TahaTesser

flutter doctor -v

[✓] Flutter (Channel beta, 2.2.0-10.3.pre, on macOS 11.3.1 20E241 darwin-x64, locale de-CH)
    • Flutter version 2.2.0-10.3.pre at /Users/yasargil/tools/flutter
    • Framework revision 06e2fd6357 (vor 3 Wochen), 2021-05-08 11:28:22 -0700
    • Engine revision a123e75c60
    • Dart version 2.13.0 (build 2.13.0-211.14.beta)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/yasargil/Library/Android/sdk
    • Platform android-30, build-tools 29.0.2
    • 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-b3-6915495)
    • 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 1.10.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] 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)

[!] IntelliJ IDEA Community Edition (version 2017.1.4)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    ✗ Flutter plugin version 14.0 - the recommended minimum version is 16.0.0
    • Dart plugin version 171.4694.29
    • For information about installing plugins, see
      https://flutter.dev/intellij-setup/#installing-the-plugins

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (2 available)
    • iPhone 11 Pro (mobile) • 20760870-7CA0-48B9-9500-DF9002CE45B7 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-4 (simulator)
    • Chrome (web)           • chrome                               • web-javascript • Google Chrome 90.0.4430.212

! Doctor found issues in 1 category.

[yasargil]

Some more context:

• Only happening on iOS. Probably because RenderAndroidView is using _PlatformViewGestureMixin.
• We have a GoogleMap widget at our root route. But the error is reported all over the navigation tree even when the map ist not visible because there is a fullscreen route over it.
• Until now no user reported any issued while using the map.

@Hixie i come back to my assumption. When i look a the code the "_handleGlobalPointerEvent" is registered in the "attach" method of the renderBox after the parent class RenderObject did send "markNeedsLayout" which may trigger a "requestVisualUpdate" on the pipeline, which apparently request a "scheduleFrame" on the engine. Are you sure that is all synchronous or cam missing a code path where the layout is done bevor attach?
Found out how it is working still investigating why size would be null under the current assumptions.

[yasargil]

I have managed to reproduce the error in our app. My assumption is correct the RenderBox is attached but not layouted and has therefore has size null. This happens when the GoogleMap ist on a route below other routes in an Navigator and was never showed on screen bevor. Now touches on the screen are sent to the _handleGlobalPointerEvent leading to the stack trace mentioned.

@Hixie could it be that routes never get a layout pass when not visible in the navigator?

[yasargil]

Steps to Reproduce

1. Run flutter create bug.
2. Update the files as follows:
   main.dart

minimal code sample

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: Navigator(
        pages: [
          MaterialPage(
            key: ValueKey('first'),
            child: FirstPage(),
          ),
          MaterialPage(
            key: ValueKey('second'),
            child: MyHomePage(
              title: 'Title',
            ),
          ),
        ],
        onPopPage: (route, result) {
          return false;
        },
      ),
    );
  }
}

class FirstPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: WebView(
        initialUrl: 'https://github.com/flutter/flutter/issues/83481',
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

pubspec.yaml
add webview_flutter: ^2.0.8 as dependency

when you click anywhere on the screen following exception will be thrown:

logs

════════ Exception caught by gesture library ═══════════════════════════════════
The following assertion was thrown while routing a pointer event:
RenderBox was not laid out: RenderUiKitView#79a1e NEEDS-LAYOUT NEEDS-PAINT
'package:flutter/src/rendering/box.dart':
Failed assertion: line 1930 pos 12: 'hasSize'

2

Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

When the exception was thrown, this was the stack
#2      RenderBox.size
package:flutter/…/rendering/box.dart:1930
#3      RenderUiKitView._handleGlobalPointerEvent
package:flutter/…/rendering/platform_view.dart:382
#4      PointerRouter._dispatch
package:flutter/…/gestures/pointer_router.dart:93
#5      PointerRouter._dispatchEventToRoutes.<anonymous closure>
package:flutter/…/gestures/pointer_router.dart:138
#6      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:397:8)
...
════════════════════════════════════════════════════════════════════════════════

[TahaTesser]

Hi @yasargil
Thanks for the code sample

logs

                    Codesigning
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftFoundation.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftFoundation.dylib
                    Codesigning
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreGraphics.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreGraphics.dylib
                    Codesigning
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCore.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCore.dylib
                    Probing signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftMetal.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftMetal.dylib
                    Probing signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreAudio.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreAudio.dylib
                    Probing signature of
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                    iftCoreMedia.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreMedia.dylib
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftMetal.dylib is unchanged; keeping original
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreAudio.dylib is unchanged; keeping original
                    Probing signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftUIKit.dylib
                    /usr/bin/codesign -r- --display
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                    iftUIKit.dylib
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                    iftDispatch.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftDispatch.dylib
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                    iftCoreFoundation.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreFoundation.dylib
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftQuartzCore.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
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                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreMedia.dylib is unchanged; keeping original
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftUIKit.dylib is unchanged; keeping original
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                    iftCoreImage.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreImage.dylib
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                    iftDispatch.dylib is unchanged; keeping original
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                    iftDarwin.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
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                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
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                    Codesigning
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                    iftCoreFoundation.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreFoundation.dylib
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreGraphics.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreGraphics.dylib
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftos.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftos.dylib
                    Codesigning
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreImage.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreImage.dylib
                    Codesigning
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftDarwin.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftDarwin.dylib
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreGraphics.dylib is unchanged; keeping original
                    Probing signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftFoundation.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftFoundation.dylib
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftFoundation.dylib is unchanged; keeping original
                    Probing signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreFoundation.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreFoundation.dylib
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftQuartzCore.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
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                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftDarwin.dylib
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreFoundation.dylib is unchanged; keeping original
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftos.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftos.dylib
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                    iftCoreImage.dylib
                    /usr/bin/codesign -r- --display
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreImage.dylib
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftQuartzCore.dylib is unchanged; keeping original
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftos.dylib is unchanged; keeping original
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftDarwin.dylib is unchanged; keeping original
                    Code signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCoreImage.dylib is unchanged; keeping original
                    Probing signature of
                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCore.dylib
                    /usr/bin/codesign -r- --display
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                    iftCore.dylib
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                    /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/libsw
                    iftCore.dylib is unchanged; keeping original

                    CodeSign /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app (in
                    target 'Runner' from project 'Runner')
                        cd /Users/tahatesser/StudioProjects/beta_flutter/ios
                        export
                        CODESIGN_ALLOCATE\=/Volumes/Extreme/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/
                        usr/bin/codesign_allocate

                        Signing Identity:     "-"

                        /usr/bin/codesign --force --sign - --entitlements
                        /Users/tahatesser/Library/Developer/Xcode/DerivedData/Runner-gcrntrybggvujmbaxtfonxnjsemv/Build/Inter
                        mediates.noindex/Runner.build/Debug-iphonesimulator/Runner.build/Runner.app.xcent --timestamp\=none
                        /Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app

                    /Users/tahatesser/StudioProjects/beta_flutter/ios/Pods/Pods.xcodeproj: warning: The iOS Simulator
                    deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment
                    target versions is 9.0 to 14.5.99. (in target 'Flutter' from project 'Pods')
                    ** BUILD SUCCEEDED **
[ +166 ms]  └─Compiling, linking and signing... (completed in 5.2s)
[        ] Xcode build done.                                           23.9s
[   +2 ms] executing: rsync -av --delete
/Users/tahatesser/StudioProjects/beta_flutter/build/ios/Debug-iphonesimulator/Runner.app
/Users/tahatesser/StudioProjects/beta_flutter/build/ios/iphonesimulator
[ +778 ms] building file list ... done
                    deleting Runner.app/Frameworks/App.framework/flutter_assets/NOTICES
                    Runner.app/
                    Runner.app/Info.plist
                    Runner.app/PkgInfo
                    Runner.app/Runner
                    Runner.app/Frameworks/
                    Runner.app/Frameworks/App.framework/
                    Runner.app/Frameworks/App.framework/App
                    Runner.app/Frameworks/App.framework/_CodeSignature/CodeResources
                    Runner.app/Frameworks/App.framework/flutter_assets/
                    Runner.app/Frameworks/App.framework/flutter_assets/AssetManifest.json
                    Runner.app/Frameworks/App.framework/flutter_assets/FontManifest.json
                    Runner.app/Frameworks/App.framework/flutter_assets/NOTICES.Z
                    Runner.app/Frameworks/App.framework/flutter_assets/isolate_snapshot_data
                    Runner.app/Frameworks/App.framework/flutter_assets/kernel_blob.bin
                    Runner.app/Frameworks/App.framework/flutter_assets/vm_snapshot_data
                    Runner.app/Frameworks/Flutter.framework/
                    Runner.app/Frameworks/Flutter.framework/Flutter
                    Runner.app/Frameworks/Flutter.framework/Info.plist
                    Runner.app/Frameworks/Flutter.framework/icudtl.dat
                    Runner.app/Frameworks/Flutter.framework/Headers/
                    Runner.app/Frameworks/Flutter.framework/Headers/Flutter.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterAppDelegate.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterBinaryMessenger.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterCallbackCache.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterChannels.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterCodecs.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterDartProject.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterEngine.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterEngineGroup.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterHeadlessDartRunner.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterMacros.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterPlatformViews.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterPlugin.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterPluginAppLifeCycleDelegate.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterTexture.h
                    Runner.app/Frameworks/Flutter.framework/Headers/FlutterViewController.h
                    Runner.app/Frameworks/Flutter.framework/Modules/
                    Runner.app/Frameworks/Flutter.framework/Modules/module.modulemap
                    Runner.app/Frameworks/Flutter.framework/_CodeSignature/
                    Runner.app/Frameworks/Flutter.framework/_CodeSignature/CodeResources
                    Runner.app/Frameworks/webview_flutter.framework/
                    Runner.app/Frameworks/webview_flutter.framework/Info.plist
                    Runner.app/Frameworks/webview_flutter.framework/webview_flutter
                    Runner.app/Frameworks/webview_flutter.framework/_CodeSignature/CodeResources
                    Runner.app/_CodeSignature/CodeResources

                    sent 82032736 bytes  received 866 bytes  54689068.00 bytes/sec
                    total size is 105556470  speedup is 1.29
[   +3 ms] executing: xcrun simctl install D72A5DAA-24E6-421B-B4F5-7CFAFB498040
/Users/tahatesser/StudioProjects/beta_flutter/build/ios/iphonesimulator/Runner.app
[+1240 ms] executing: /usr/bin/plutil -convert json -o -
/Users/tahatesser/StudioProjects/beta_flutter/build/ios/iphonesimulator/Runner.app/Info.plist
[  +11 ms] Exit code 0 from: /usr/bin/plutil -convert json -o -
/Users/tahatesser/StudioProjects/beta_flutter/build/ios/iphonesimulator/Runner.app/Info.plist
[   +1 ms]
{"CFBundleName":"beta_flutter","DTXcode":"1250","DTSDKName":"iphonesimulator14.5","UILaunchStoryboardName":"LaunchScreen","CF
BundleIcons~ipad":{"CFBundlePrimaryIcon":{"CFBundleIconFiles":["AppIcon20x20","AppIcon29x29","AppIcon40x40","AppIcon60x60","A
ppIcon76x76","AppIcon83.5x83.5"],"CFBundleIconName":"AppIcon"}},"DTSDKBuild":"18E182","CFBundleDevelopmentRegion":"en","CFBun
dleVersion":"1","BuildMachineOSBuild":"20E241","DTPlatformName":"iphonesimulator","CFBundlePackageType":"APPL","UIMainStorybo
ardFile":"Main","CFBundleSupportedPlatforms":["iPhoneSimulator"],"CFBundleShortVersionString":"1.0.0","CFBundleInfoDictionary
Version":"6.0","CFBundleExecutable":"Runner","DTCompiler":"com.apple.compilers.llvm.clang.1_0","UISupportedInterfaceOrientati
ons~ipad":["UIInterfaceOrientationPortrait","UIInterfaceOrientationPortraitUpsideDown","UIInterfaceOrientationLandscapeLeft",
"UIInterfaceOrientationLandscapeRight"],"MinimumOSVersion":"9.0","CFBundleIdentifier":"com.example.betaFlutter","UIDeviceFami
ly":[1,2],"DTPlatformVersion":"14.5","CFBundleSignature":"????","CFBundleIcons":{"CFBundlePrimaryIcon":{"CFBundleIconFiles":[
"AppIcon20x20","AppIcon29x29","AppIcon40x40","AppIcon60x60"],"CFBundleIconName":"AppIcon"}},"DTXcodeBuild":"12E262","LSRequir
esIPhoneOS":true,"UISupportedInterfaceOrientations":["UIInterfaceOrientationPortrait","UIInterfaceOrientationLandscapeLeft","
UIInterfaceOrientationLandscapeRight"],"UIViewControllerBasedStatusBarAppearance":false,"NSBonjourServices":["_dartobservator
y._tcp"],"DTPlatformBuild":"18E182","NSLocalNetworkUsageDescription":"Allow Flutter tools on your computer to connect and
debug your application. This prompt will not appear on release builds."}
[   +4 ms] executing: xcrun simctl launch D72A5DAA-24E6-421B-B4F5-7CFAFB498040 com.example.betaFlutter
--enable-dart-profiling --enable-checked-mode --verify-entry-points --observatory-port=0
[ +272 ms] com.example.betaFlutter: 37536
[        ] Waiting for observatory port to be available...
[ +724 ms] Observatory URL on device: http://127.0.0.1:60884/Xn0vYPNSZk0=/
[  +10 ms] Caching compiled dill
[ +212 ms] Connecting to service protocol: http://127.0.0.1:60884/Xn0vYPNSZk0=/
[ +200 ms] Launching a Dart Developer Service (DDS) instance at http://127.0.0.1:0, connecting to VM service at
http://127.0.0.1:60884/Xn0vYPNSZk0=/.
[  +94 ms] DDS is listening at http://127.0.0.1:60889/0eScwzT6yPI=/.
[  +84 ms] Successfully connected to service protocol: http://127.0.0.1:60884/Xn0vYPNSZk0=/
[  +26 ms] DevFS: Creating new filesystem on the device (null)
[  +22 ms] DevFS: Created new filesystem on the device
(file:///Users/tahatesser/Library/Developer/CoreSimulator/Devices/D72A5DAA-24E6-421B-B4F5-7CFAFB498040/data/Containers/Data/A
pplication/1CFFA0C7-A79A-464C-ABD7-D0FE78A639B9/tmp/beta_flutter7FC9El/beta_flutter/)
[   +3 ms] Updating assets
[ +130 ms] Syncing files to device iPhone 12...
[   +2 ms] <- reset
[        ] Compiling dart to kernel with 0 updated files
[   +4 ms] <- recompile package:beta_flutter/main.dart 8b85966d-55c0-4137-82b2-0918df9f14e0
[        ] <- 8b85966d-55c0-4137-82b2-0918df9f14e0
[ +228 ms] Updating files.
[        ] DevFS: Sync finished
[        ] Syncing files to device iPhone 12... (completed in 236ms)
[        ] Synced 0.0MB.
[   +1 ms] <- accept
[   +9 ms] Connected to _flutterView/0x7f8b9880ee20.
[   +3 ms] Flutter run key commands.
[   +1 ms] r Hot reload. 🔥🔥🔥
[        ] R Hot restart.
[        ] h List all available interactive commands.
[        ] d Detach (terminate "flutter run" but leave application running).
[        ] c Clear the screen
[        ] q Quit (terminate the application on the device).
[        ] 💪 Running with sound null safety 💪
[        ] An Observatory debugger and profiler on iPhone 12 is available at: http://127.0.0.1:60889/0eScwzT6yPI=/
[ +332 ms] DevTools activation throttled until 2021-05-28 22:25:11.789800.
[ +684 ms] The Flutter DevTools debugger and profiler on iPhone 12 is available at:
                    http://127.0.0.1:9102?uri=http%3A%2F%2F127.0.0.1%3A60889%2F0eScwzT6yPI%3D%2F
[+30140 ms] 
                     ══╡ EXCEPTION CAUGHT BY GESTURE LIBRARY ╞═══════════════════════════════════════════════════════════
                     The following assertion was thrown while routing a pointer event:
                     RenderBox was not laid out: RenderUiKitView#fe2b9 NEEDS-LAYOUT NEEDS-PAINT
                     'package:flutter/src/rendering/box.dart':
                     Failed assertion: line 1929 pos 12: 'hasSize'
                     
                     Either the assertion indicates an error in the framework itself, or we should provide substantially
                     more information in this error message to help you determine and fix the underlying cause.
                     In either case, please report this assertion by filing a bug on GitHub:
                       https://github.com/flutter/flutter/issues/new?template=2_bug.md
                     
                     When the exception was thrown, this was the stack:
                     #2      RenderBox.size (package:flutter/src/rendering/box.dart:1929:12)
                     #3      RenderUiKitView._handleGlobalPointerEvent
(package:flutter/src/rendering/platform_view.dart:382:25)
                     #4      PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
                     #5      PointerRouter._dispatchEventToRoutes.<anonymous closure>
(package:flutter/src/gestures/pointer_router.dart:139:9)
                     #6      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:397:8)
                     #7      PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
                     #8      PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:129:5)
                     #9      GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:440:19)
                     #10     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:420:22)
                     #11     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:287:11)
                     #12     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
                     #13     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
                     #14     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
                     #15     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
                     #19     _invoke1 (dart:ui/hooks.dart:182:10)
                     #20     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:282:7)
                     #21     _dispatchPointerDataPacket (dart:ui/hooks.dart:96:31)
                     (elided 5 frames from class _AssertionError and dart:async)
                     
                     router: Instance of 'PointerRouter'
                     route: Closure: (PointerEvent) => void from Function '_handleGlobalPointerEvent@361508051':.
                     event: PointerDownEvent#e057e(position: Offset(162.3, 536.7))
                     ════════════════════════════════════════════════════════════════════════════════════════════════════
[ +457 ms] 
                    Another exception was thrown: RenderBox was not laid out: RenderUiKitView#fe2b9 NEEDS-LAYOUT NEEDS-PAINT

Tested the code sample on the following channels

stable	beta	dev	master
❗	❗	❗	❗

Check flutter doctor -v outputs for each channel below

flutter doctor -v

[✓] Flutter (Channel stable, 2.2.1, on macOS 11.3.1 20E241 darwin-x64, locale
    en-GB)
    • Flutter version 2.2.1 at /Users/tahatesser/Code/flutter_stable
    • Framework revision 02c026b03c (19 hours ago), 2021-05-27 12:24:44 -0700
    • Engine revision 0fdb562ac8
    • Dart version 2.13.1

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Volumes/Extreme/SDK
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = /Volumes/Extreme/SDK
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.5, Build version 12E262
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2)
    • 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 11.0.8+10-b944.6916264)

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (4 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E            • ios
      • iOS 14.6
    • iPhone 12 (mobile)     • D72A5DAA-24E6-421B-B4F5-7CFAFB498040 • ios
      • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-x64
      • macOS 11.3.1 20E241 darwin-x64
    • Chrome (web)           • chrome                               •
      web-javascript • Google Chrome 90.0.4430.212

• No issues found!

[✓] Flutter (Channel beta, 2.2.0, on macOS 11.3.1 20E241 darwin-x64, locale
    en-GB)
    • Flutter version 2.2.0 at /Users/tahatesser/Code/flutter_beta
    • Framework revision b22742018b (2 weeks ago), 2021-05-14 19:12:57 -0700
    • Engine revision a9d88a4d18
    • Dart version 2.13.0

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Volumes/Extreme/SDK
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = /Volumes/Extreme/SDK
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.5, Build version 12E262
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2)
    • 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 11.0.8+10-b944.6916264)

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (4 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E            • ios
      • iOS 14.6
    • iPhone 12 (mobile)     • D72A5DAA-24E6-421B-B4F5-7CFAFB498040 • ios
      • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-x64
      • macOS 11.3.1 20E241 darwin-x64
    • Chrome (web)           • chrome                               •
      web-javascript • Google Chrome 90.0.4430.212

• No issues found!

[✓] Flutter (Channel dev, 2.3.0-16.0.pre, on macOS 11.3.1 20E241 darwin-x64,
    locale en-GB)
    • Flutter version 2.3.0-16.0.pre at /Users/tahatesser/Code/flutter_dev
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision fa5883b78e (7 days ago), 2021-05-21 13:04:03 -0700
    • Engine revision 2f067fc4c5
    • Dart version 2.14.0 (build 2.14.0-136.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Volumes/Extreme/SDK
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = /Volumes/Extreme/SDK
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.5, Build version 12E262
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2)
    • 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 11.0.8+10-b944.6916264)

[✓] IntelliJ IDEA Community Edition (version 2021.1.1)
    • IntelliJ at /Volumes/Extreme/IntelliJ IDEA CE.app
    • Flutter plugin version 56.0.5
    • Dart plugin version 211.7233

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (4 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E            • ios
      • iOS 14.6
    • iPhone 12 (mobile)     • D72A5DAA-24E6-421B-B4F5-7CFAFB498040 • ios
      • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-x64
      • macOS 11.3.1 20E241 darwin-x64
    • Chrome (web)           • chrome                               •
      web-javascript • Google Chrome 90.0.4430.212

• No issues found!

[✓] Flutter (Channel master, 2.3.0-17.0.pre.111, on macOS 11.3.1 20E241
    darwin-x64, locale en-GB)
    • Flutter version 2.3.0-17.0.pre.111 at
      /Users/tahatesser/Code/flutter_master
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 6a38994cb8 (8 hours ago), 2021-05-28 02:09:02 -0400
    • Engine revision ecfd7bdffe
    • Dart version 2.14.0 (build 2.14.0-162.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Volumes/Extreme/SDK
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = /Volumes/Extreme/SDK
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.5, Build version 12E262
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.2)
    • 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 11.0.8+10-b944.6916264)

[✓] IntelliJ IDEA Community Edition (version 2021.1.1)
    • IntelliJ at /Volumes/Extreme/IntelliJ IDEA CE.app
    • Flutter plugin version 56.0.5
    • Dart plugin version 211.7233

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.22.0

[✓] Connected device (4 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E            • ios
      • iOS 14.6
    • iPhone 12 (mobile)     • D72A5DAA-24E6-421B-B4F5-7CFAFB498040 • ios
      • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • macOS (desktop)        • macos                                • darwin-x64
      • macOS 11.3.1 20E241 darwin-x64
    • Chrome (web)           • chrome                               •
      web-javascript • Google Chrome 90.0.4430.212

• No issues found!

✅ : No Issue ❗: Has issue