There is a bug at TextField when input Chinese Pin Yin

[lukailun]

If there are two textFields in the screen.
when I input text at the first textField in Chinese Pin Yin
then I tap the second textField and the second textField become first responser.
The app crash.

[lukailun]

just on iOS!
Android is OK

[zoechi]

Please add the output of flutter doctor -v

and a minimal runnable reproduction in a single file lib/main.dart that can just be copied into a new project created with flutter create foo and run to reproduce.

[Aries233]

I have the same problem as you

[zoechi]

Can you please at least post the output of flutter doctor -v?

[manhnhhdvn]

@zoechi : I had the same error. It happened with my Japanese keyboard. My app was crashed when I switched focus to another text field before finishing IME composition in the former text field

Description:

Crash case	Normal case
1. Input any text in the first text field, but do not tap the「確定」button . 2. Tap the second text field, app will be crashed	1. Input text in the first text field. 2. Tap the「確定」button (this button will be 「完了」button). 3. Tap the second text field, app will not be crashed

My code:

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Container(
              child: TextFormField(
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  labelText: "Test 1",
                  hintText: "",
                ),
              ),
            ),
            Container(height: 10),
            Container(
              child: TextFormField(
                decoration: InputDecoration(
                  border: OutlineInputBorder(),
                  labelText: "Test 2",
                  hintText: "",
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

flutter doctor -v

[✓] Flutter (Channel dev, v0.11.12, on Mac OS X 10.14.1 18B75, locale ja-JP)
    • Flutter version 0.11.12 at /Users/ManhNH/Works/Projects/Flutter/flutter
    • Framework revision 06ec8d3b41 (4 days ago), 2018-11-28 15:56:58 -0800
    • Engine revision 72c7a75672
    • Dart version 2.1.0 (build 2.1.0-dev.9.4 f9ebf21297)

[✓] Android toolchain - develop for Android devices (Android SDK 28.0.3)
    • Android SDK at /Users/ManhNH/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling
      support)
    • Platform android-28, build-tools 28.0.3
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_152-release-1136-b06)
    • All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 10.1, Build version 10B61
    • ios-deploy 1.9.4
    • CocoaPods version 1.5.3

[✓] Android Studio (version 3.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 30.0.1
    • Dart plugin version 181.5656
    • Java version OpenJDK Runtime Environment (build
      1.8.0_152-release-1136-b06)

[✓] VS Code (version 1.29.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 2.20.0

[✓] Connected device (3 available)
    • Android SDK built for x86 • emulator-5554                        •
      android-x86 • Android 8.0.0 (API 26) (emulator)
    • Eole XS MAX               • 00008020-001C48180A84002E            • ios
      • iOS 12.0
    • iPhone XR                 • ABF2313D-6E8F-4915-8A48-4FFCCF874C4C • ios
      • iOS 12.1 (simulator)

• No issues found!

Error log in Xcode

2018-12-03 12:08:53.665884+0900 Runner[354:11931] You've implemented -[<UIApplicationDelegate> application:performFetchWithCompletionHandler:], but you still need to add "fetch" to the list of your supported UIBackgroundModes in your Info.plist.
2018-12-03 12:08:53.665922+0900 Runner[354:11931] You've implemented -[<UIApplicationDelegate> application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.
2018-12-03 12:08:53.874099+0900 Runner[354:11987] flutter: Observatory listening on http://127.0.0.1:51125/
2018-12-03 12:11:03.677461+0900 Runner[354:11931] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2018-12-03 12:11:03.677654+0900 Runner[354:11931] [MC] Reading from public effective user settings.
2018-12-03 12:11:39.014466+0900 Runner[354:11931] *** Terminating app due to uncaught exception 'NSRangeException', reason: '-[__NSCFString substringWithRange:]: Range {0, 4} out of bounds; string length 0'
*** First throw call stack:
(0x218177f78 0x217370284 0x21807875c 0x218066278 0x2452c6be0 0x2452b5b94 0x245323124 0x24532174c 0x245322174 0x2452b5b44 0x2452c83c8 0x104b2c7b8 0x104b2dcbc 0x104b1b588 0x104b39540 0x104b3d610 0x104b91168 0x104b492c8 0x104b4c77c 0x2181050a4 0x218104dd0 0x2181045c4 0x2180ff284 0x2180fe844 0x21a3adbe8 0x2454ad428 0x1046fd09c 0x217bb4020)
libc++abi.dylib: terminating with uncaught exception of type NSException

[HansMuller]

This appears to be a duplicate of #24276 for which there are fixes underway: #24861 and flutter/engine#6989

cc @justinmc

[justinmc]

Thanks, that's right!