objective c - Crash With iOS Private API Call -


this call:

[uikeyboardimpl(shortcutconversionsupport) _shortcutconversioncandidateforinput:]

is crashing app. googling , looking through apple's api documentation brings no results. have never seen call being made anywhere in app. put break-point @ location believe getting called at. here crash report:

(fyi, crash log not symbolicated when using 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 crashing @ substringwithrange: when particular shortcutconversionsupport method called? believe me isolate issue.

this issue:

- (uitextrange *)textrangefromposition:(uitextposition *)fromposition toposition:(uitextposition *)toposition {     // generate indexedposition instances wrap , 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 compiler thinks product of negation nsuinteger because to.index , from.index both nsuinteger variables (so value can never negative). therefore, if from.index > to.index value overflow producing value max size of 32 bit uint rather negative value. note, abs uses typeof determine return value of product. 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 way, only occurs when user has removed of shortcuts in settings > general > keyboard > shortcuts.


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