The iOS keyboard occasionally displays blank

[gp-zhang]

Steps to reproduce

1. flutter create testapp
2. Paste the following code
3. Run on a real iPhone
4. Quick operation to display and hide keyboard

I tried Flutter 3.24.4, 3.19.1, and 3.19.6, but they all had the same problem

Expected results

The keyboard should display and hide normally

Actual results

The keyboard displays blank, and clicking on the blank keyboard will display it again

Code sample

Code sample

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTapDown: (details) {
        FocusManager.instance.primaryFocus?.unfocus();
      },
      child: Scaffold(
        appBar: AppBar(
          title: Text(title),
        ),
        body: Container(
          color: Colors.amberAccent,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: <Widget>[
              TextField(
                decoration: InputDecoration(border: OutlineInputBorder()),
              ),
              TextField(
                decoration: InputDecoration(border: OutlineInputBorder()),
              )
            ],
          ),
        ),
      ),
    );
  }
}

Screenshots or Video

Screenshots / Video demonstration

#[Upload media here]

ios_keyboard.mp4

Logs

Logs

NSBundle file:///System/Library/PrivateFrameworks/MetalTools.framework/ principal class is nil because all fallbacks have failed
flutter: The Dart VM service is listening on http://127.0.0.1:65441/s3Qc4GXhIRI=/
UIKeyboardLayoutStar implements focusItemsInRect: - caching for linear focus movement is limited as long as this view is on screen.

Flutter Doctor output

Doctor output

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.4, on macOS 15.0 24A335 darwin-arm64, locale zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2023.3)
[✓] IntelliJ IDEA Ultimate Edition (version 2022.1)
[✓] VS Code (version 1.95.0)
[✓] Connected device (5 available)
[!] Network resources                   
    ✗ A network error occurred while checking "https://maven.google.com/": Operation timed out

! Doctor found issues in 1 category.

[huycozy]

Hi @gp-zhang
Can you share device info (OS version, model name)? Is it possible to check this with iOS native project to see if the same issue happens there?

[gp-zhang]

@huycozy iPhone 12 mini ,iOS 18.0

[huycozy]

I also tried on iPhone 16 Pro, iOS 18.0 (simulator) but couldn't reproduce this. Can you check on a native iOS project?
Please also try on Flutter master channel. Thanks!

[github-actions]

Without additional information, we are unfortunately not sure how to resolve this issue. We are therefore reluctantly going to close this bug for now.
If you find this problem please file a new issue with the same description, what happens, logs and the output of 'flutter doctor -v'. All system setups can be slightly different so it's always better to open new issues and reference the related ones.
Thanks for your contribution.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.