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Editorial Team
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Asked: 2026-06-05T11:10:10+00:00

This call: [UIKeyboardImpl(ShortcutConversionSupport) _shortcutConversionCandidateForInput:] is crashing my app. Googling and looking through Apple’s API

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This call:

[UIKeyboardImpl(ShortcutConversionSupport) _shortcutConversionCandidateForInput:]

is crashing my app. Googling and looking through Apple’s API documentation brings up no results. I have never seen this call being made anywhere in my app. I also put a break-point at the location I believe it is getting called at. Here is the crash report:

(FYI, the crash log could not be completely symbolicated even when using the correct dSYM file. No idea why)

Last Exception Backtrace:
0   CoreFoundation                  0x327e188f __exceptionPreprocess + 163
1   libobjc.A.dylib                 0x34837259 objc_exception_throw + 33
2   CoreFoundation                  0x327e1789 +[NSException raise:format:] + 1
3   CoreFoundation                  0x327e17ab +[NSException raise:format:] + 35
4   CoreFoundation                  0x3273bf5b -[__NSCFString substringWithRange:] + 103
5   Buffer                          0x000fa061 0xd6000 + 147553
6   UIKit                           0x32348137 -[UIKeyboardImpl(ShortcutConversionSupport) _shortcutConversionCandidateForInput:] + 615
7   UIKit                           0x32322c07 -[UIKeyboardImpl addInputString:fromVariantKey:] + 287
8   UIKit                           0x32322ae1 -[UIKeyboardImpl handleStringInput:fromVariantKey:] + 165
9   UIKit                           0x32321829 -[UIKeyboardImpl handleKeyEvent:] + 1501
10  UIKit                           0x02b10261 0x2af4000 + 115297
11  UIKit                           0x324bb8a3 -[UIKeyboardLayoutStar sendStringAction:forKey:isPopupVariant:] + 487
12  UIKit                           0x3231fdcd -[UIKeyboardLayoutStar touchUp:] + 3197
13  UIKit                           0x02b2ab47 0x2af4000 + 224071
14  UIKit                           0x3231f0fd -[UIKeyboardLayout touchesEnded:withEvent:] + 381
15  UIKit                           0x3222292b -[UIWindow _sendTouchesForEvent:] + 319
16  UIKit                           0x32222319 -[UIWindow sendEvent:] + 381
17  UIKit                           0x32208695 -[UIApplication sendEvent:] + 357
18  UIKit                           0x32207f3b _UIApplicationHandleEvent + 5827
19  GraphicsServices                0x3188f22b PurpleEventCallback + 883
20  CoreFoundation                  0x327b5523 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 39
21  CoreFoundation                  0x327b54c5 __CFRunLoopDoSource1 + 141
22  CoreFoundation                  0x327b4313 __CFRunLoopRun + 1371
23  CoreFoundation                  0x327374a5 CFRunLoopRunSpecific + 301
24  CoreFoundation                  0x3273736d CFRunLoopRunInMode + 105
25  GraphicsServices                0x3188e439 GSEventRunModal + 137
26  UIKit                           0x32236cd5 UIApplicationMain + 1081
27  Buffer                          0x000d8327 0xd6000 + 8999
28  Buffer                          0x000d7dcc 0xd6000 + 7628

I understand that is crashing at substringWithRange: but when does this particular ShortcutConversionSupport method get called? I believe that will help me isolate the issue.

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1 Answer

  1. Editorial Team

    This is the issue:

    - (UITextRange *)textRangeFromPosition:(UITextPosition *)fromPosition toPosition:(UITextPosition *)toPosition
{    
// Generate IndexedPosition instances that wrap the to and from ranges
    IndexedPosition *from = (IndexedPosition *)fromPosition;
    IndexedPosition *to = (IndexedPosition *)toPosition;  

    NSRange range = NSMakeRange(MIN(from.index, to.index), ABS(to.index - from.index));
    return [IndexedRange rangeWithNSRange:range];    

}

    More specifically: ABS(to.index – from.index)

    The issue is that the compiler thinks that the product of this negation is a NSUInteger because to.index and from.index are both NSUInteger variables (so the value can never be negative). Therefore, if from.index > to.index the value would overflow producing a value that is the max size of a 32 bit uint rather than a negative value. Also note, ABS uses typeof to determine the return value of the product. This is the fix:

    - (UITextRange *)textRangeFromPosition:(UITextPosition *)fromPosition toPosition:(UITextPosition *)toPosition
{    
    IndexedPosition *from = (IndexedPosition *)fromPosition;
    IndexedPosition *to = (IndexedPosition *)toPosition;  

    NSInteger index = to.index - from.index;    
    NSRange range = NSMakeRange(MIN(from.index, to.index), ABS(index));

    return [IndexedRange rangeWithNSRange:range];

}

    By the way, this only occurs when a user has removed all of the Shortcuts in Settings > General > Keyboard > Shortcuts.

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