Flutter iOS 12.0 textfield crash with CJK input method

[HipSze]

Steps to Reproduce

1. Create two textfields

2. Select some characters in Chinese( Chinese(Traditional) - Cangjie) keyboard in the first textfield, then select the second textfield without choosing a Chinese character from the prediction.
   Here is the example image:
   https://www.dropbox.com/s/gt540b5188egfvp/1.png?dl=0

3. the app will crash (only in iOS 12.0, it would not crash in iOS 11.4)

Flutter console show:

*** First throw call stack:
(
0   CoreFoundation                      0x000000010b12029b __exceptionPreprocess + 331
1   libobjc.A.dylib                     0x000000010a6c4735 objc_exception_throw + 48
2   CoreFoundation                      0x000000010b1200f5 +[NSException raise:format:] + 197
3   CoreFoundation                      0x000000010b0666e3 -[__NSCFString substringWithRange:] + 163
4   UIKitCore                           0x000000011497fb5a -[UIKeyboardImpl hasMarkedText] + 143
5   UIKitCore                           0x000000011496f3a8 __43-[UIKeyboardImpl generateAutofillCandidate]_block_invoke + 51
6   UIKitCore                           0x00000001149da9bf -[UIKeyboardTaskEntry execute:] + 169
7   UIKitCore                           0x00000001149d91ae -[UIKeyboardTaskQueue continueExecutionOnMainThread] + 374
8   UIKitCore  <…>
Lost connection to device.
Exited (sigterm)

Xcode console show:

2018-09-24 12:47:07.185255+0800 Runner[278:28523] *** Terminating app due to uncaught exception 'NSRangeException', reason: '-[__NSCFString substringWithRange:]: Range {0, 3} out of bounds; string length 0'
*** First throw call stack:
(0x1b4ccbf78 0x1b3ec4284 0x1b4bcc75c 0x1b4bba278 0x1e1e1abe0 0x1e1e09b94 0x1e1e77124 0x1e1e7574c 0x1e1e76174 0x1e1e09b44 0x1e1e1c3c8 0x105abe944 0x105abfe38 0x105ab2fa8 0x105acd628 0x105acf25c 0x105b1ee24 0x105adca88 0x105adf8c8 0x1b4c590a4 0x1b4c58dd0 0x1b4c585c4 0x1b4c53284 0x1b4c52844 0x1b6f01be8 0x1e2001428 0x104445cb4 0x1b4708020)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

Logs

Analyzing ctm...

   info • Unused import: 'package:geocoder/geocoder.dart' • lib/drawerPage/location_page.dart:5:8 • unused_import
   info • The value of the local variable '_isLoggin' isn't used • lib/login.dart:67:10 • unused_local_variable

2 issues found. (ran in 1.7s)

[✓] Flutter (Channel beta, v0.8.2, on Mac OS X 10.13.6 17G2307, locale en-HK)
    • Flutter version 0.8.2 at /Users/kenwong/Development/flutter
    • Framework revision 5ab9e70727 (2 weeks ago), 2018-09-07 12:33:05 -0700
    • Engine revision 58a1894a1c
    • Dart version 2.1.0-dev.3.1.flutter-760a9690c2

[✓] Android toolchain - develop for Android devices (Android SDK 28.0.1)
    • Android SDK at /Users/kenwong/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.1
    • 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-1024-b01)
    • All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 10.0)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 10.0, Build version 10A255
    • ios-deploy 1.9.2
    • CocoaPods version 1.5.3

[✓] Android Studio (version 3.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 27.1.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[✓] IntelliJ IDEA Community Edition (version 2018.2)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 26.0.3
    • Dart plugin version 182.3569.4

[✓] VS Code (version 1.27.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 2.18.0

[✓] Connected devices (1 available)
    • iPhone XS Max • B3E2C057-F13D-4916-A3CE-D8D0BE924DC5 • ios • iOS 12.0 (simulator)

• No issues found!

[najeira]

I got similar crashes:

Fatal Exception: NSRangeException
0  CoreFoundation                 0x189363ef8 __exceptionPreprocess
1  libobjc.A.dylib                0x188531a40 objc_exception_throw
2  CoreFoundation                 0x189268ac4 -[NSCache init]
3  CoreFoundation                 0x189256cdc -[__NSCFString substringWithRange:]
4  UIKitCore                      0x1b5a0ff8c -[UIKeyboardImpl hasMarkedText]
5  UIKitCore                      0x1b59ff5f8 __43-[UIKeyboardImpl generateAutofillCandidate]_block_invoke
6  UIKitCore                      0x1b5a69064 -[UIKeyboardTaskEntry execute:]
7  UIKitCore                      0x1b5a67774 -[UIKeyboardTaskQueue continueExecutionOnMainThread]
8  UIKitCore                      0x1b5a6814c -[UIKeyboardTaskQueue performTask:]
9  UIKitCore                      0x1b59ff5ac -[UIKeyboardImpl generateAutofillCandidate]
10 UIKitCore                      0x1b5a11670 -[UIKeyboardImpl selectionDidChange:]
11 Flutter                        0x102f6db90 (Missing)
12 Flutter                        0x102f6f084 (Missing)
13 Flutter                        0x102f61dc8 __45-[FlutterMethodChannel setMethodCallHandler:]_block_invoke
14 Flutter                        0x102f7dc6c shell::HeadlessPlatformViewIOS::HandlePlatformMessage(fml::RefPtr<blink::PlatformMessage>)
15 Flutter                        0x102fba4b4 std::__1::__function::__func<shell::Shell::OnEngineHandlePlatformMessage(fml::RefPtr<blink::PlatformMessage>)::$_26, std::__1::allocator<shell::Shell::OnEngineHandlePlatformMessage(fml::RefPtr<blink::PlatformMessage>)::$_26>, void ()>::operator()()
16 Flutter                        0x102f8b01c fml::MessageLoopImpl::RunExpiredTasks()
17 Flutter                        0x102f8c328 fml::MessageLoopDarwin::OnTimerFire(__CFRunLoopTimer*, fml::MessageLoopDarwin*)
18 CoreFoundation                 0x1892f2bf0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
19 CoreFoundation                 0x1892f2920 __CFRunLoopDoTimer
20 CoreFoundation                 0x1892f2154 __CFRunLoopDoTimers
21 CoreFoundation                 0x1892ed030 __CFRunLoopRun
22 CoreFoundation                 0x1892ec5b8 CFRunLoopRunSpecific
23 GraphicsServices               0x18b560584 GSEventRunModal
24 UIKitCore                      0x1b5be7558 UIApplicationMain
25 Runner                         0x10230d5e4 main (AppDelegate.swift:14)
26 libdyld.dylib                  0x188dacb94 start

[buaashuai]

I meet this similar crash too:

Trapped uncaught exception 'NSRangeException', reason: '-[__NSCFString substringWithRange:]: Range {7, 5} out of bounds; string length 4' 
(
	0   CoreFoundation                      0x00000001d1b9ef10 <redacted> + 252
	1   libobjc.A.dylib                     0x00000001d0d6ca40 objc_exception_throw + 56
	2   CoreFoundation                      0x00000001d1aa3ac4 <redacted> + 0
	3   CoreFoundation                      0x00000001d1a91cdc <redacted> + 168
	4   UIKitCore                           0x00000001fdf8ff8c <redacted> + 144
	5   UIKitCore                           0x00000001fdf7f5f8 <redacted> + 60
	6   UIKitCore                           0x00000001fdfe9064 <redacted> + 200
	7   UIKitCore                           0x00000001fdfe7774 <redacted> + 384
	8   UIKitCore                           0x00000001fdfe814c <redacted> + 136
	9   UIKitCore                           0x00000001fdf7f5ac <redacted> + 136
	10  UIKitCore                           0x00000001fdf91670 <redacted> + 324
	11  Flutter                             0x0000000101242ff0 -[FlutterTextInputView setTextInputState:] + 580
	12  Flutter                             0x00000001012444e4 -[FlutterTextInputPlugin handleMethodCall:result:] + 340
	13  Flutter                             0x0000000101237688 __45-[FlutterMethodChannel setMethodCallHandler:]_block_invoke + 128
	14  Flutter                             0x0000000101251530 _ZNK5shell21PlatformMessageRouter21HandlePlatformMessageEN3fml6RefPtrIN5blink15PlatformMessageEEE + 224
	15  Flutter                             0x0000000101253164 _ZN5shell23HeadlessPlatformViewIOS21HandlePlatformMessageEN3fml6RefPtrIN5blink15PlatformMessageEEE + 40
	16  Flutter                             0x00000001012a39fc _ZNSt3__110__function6__funcIZN5shell5Shell29OnEngineHandlePlatformMessageEN3fml6RefPtrIN5blink15PlatformMessageEEEE4$_26NS_9allocatorIS9_EEFvvEEclEv + 80
	17  Flutter                             0x000000010125ff88 _ZN3fml15MessageLoopImpl15RunExpiredTasksEv + 824
	18  Flutter                             0x0000000101262f90 _ZN3fml17MessageLoopDarwin11OnTimerFireEP16__CFRunLoopTimerPS0_ + 32
	19  CoreFoundation                      0x00000001d1b2dbf0 <redacted> + 28
	20  CoreFoundation                      0x00000001d1b2d920 <redacted> + 864
	21  CoreFoundation                      0x00000001d1b2d154 <redacted> + 248
	22  CoreFoundation                      0x00000001d1b28030 <redacted> + 1880
	23  CoreFoundation                      0x00000001d1b275b8 CFRunLoopRunSpecific + 436
	24  GraphicsServices                    0x00000001d3d9b584 GSEventRunModal + 100
	25  UIKitCore                           0x00000001fe167558 UIApplicationMain + 212
	26  Runner                              0x00000001009a3430 main + 124
	27  libdyld.dylib                       0x00000001d15e7b94 <redacted> + 4
)

[z2228391]

I had the same problem, is any way to solve this issue?

[HipSze]

I had the same problem, is any way to solve this issue?

You can dismiss the keyboard when you type in other TextField. But, it is so stupid. I hope flutter or iOS 12 can fix this bug. It is big problem because I need to put my app to App Store.

[naro143]

Problem crashing with Japanese, CJK input to TextField, TextFormField.
To fix it we need to change attribute "autocorrect" of TextField, TextFormField to "false".

[eseidelGoogle]

@cbracken would know how to get this fix. FYI @xster

[lichentao]

ME TOO how to Resulation