title: Crash With iOS Private API Call
body: <p>This call:</p>
  
  <pre><code>[UIKeyboardImpl(ShortcutConversionSupport) _shortcutConversionCandidateForInput:]
  </code></pre>
  
  <p>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 <em>believe</em> it is getting called at. Here is the crash report:</p>
  
  <p>(FYI, the crash log could not be completely symbolicated even when using the correct dSYM file. No idea why)</p>
  
  <pre><code>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
  </code></pre>
  
  <p>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.</p>