Crash when attempting to undo after unsuccessfully pasting into UITextField

Originator:web
Number:rdar://32508213 Date Originated:
Status:Closed Resolved:
Product:iOS + UIKit Product Version:10.3.x
Classification:Crash Reproducible:Always
 
Summary:
When attempting to undo a paste operation on a UITextField that implements the '- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string' delegate method which returned 'NO' the app will crash:

 *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSBigMutableString substringWithRange:]: Range {0, 568} out of bounds; string length 0'

Steps to Reproduce:
1. Implement an app with a UITextField
2. Implement the UITextFieldDelegate protocol and assign the UITextField delegate
3. Implement the '- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string' method
4. Return NO from that method
5. Run app and attempt to paste text into the UITextField and observe that no text is actually pasted
6. Shake the phone to trigger the Undo prompt
7. Tap the Undo button in the prompt and observe crash

Expected Results:
The app should not crash. 

Actual Results:
The app crashes due to iOS recording the unsuccessful paste operation as something that can be undone.

Regression:
Always occours

Notes:

Full crash report:

 *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSBigMutableString substringWithRange:]: Range {0, 568} out of bounds; string length 0'
*** First throw call stack:
(
	0   CoreFoundation                      0x000000010abfbb0b __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x000000010a33e141 objc_exception_throw + 48
	2   CoreFoundation                      0x000000010ac64625 +[NSException raise:format:] + 197
	3   Foundation                          0x0000000109e19a61 -[NSString substringWithRange:] + 131
	4   UIKit                               0x000000010c85baf8 -[NSTextStorage(UIKitUndoExtensions) _undoRedoAttributedSubstringFromRange:] + 136
	5   UIKit                               0x000000010c85bf4a -[_UITextUndoOperationReplace undoRedo] + 306
	6   Foundation                          0x0000000109ed0463 -[_NSUndoStack popAndInvoke] + 280
	7   Foundation                          0x0000000109ed01f2 -[NSUndoManager undoNestedGroup] + 433
	8   UIKit                               0x000000010bc7a138 -[UIApplication alertView:clickedButtonAtIndex:] + 151
	9   UIKit                               0x000000010bfe98fc -[UIAlertView _prepareToDismissForTappedIndex:] + 134
	10  UIKit                               0x000000010bfe933e __35-[UIAlertView _prepareAlertActions]_block_invoke.50 + 53
	11  UIKit                               0x000000010bfd2404 -[UIAlertController _dismissAnimated:triggeringAction:triggeredByPopoverDimmingView:] + 1080
	12  UIKit                               0x000000010c75ceca -[_UIAlertControllerView interfaceAction:invokeActionHandler:completion:] + 337
	13  UIKit                               0x000000010c82f398 -[UIInterfaceActionGroupView interfaceAction:invokeActionHandler:completion:] + 105
	14  UIKit                               0x000000010c54aa23 -[UIInterfaceAction _invokeHandlerWithCompletionBlock:] + 163
	15  UIKit                               0x000000010c316d4f -[UIInterfaceActionSelectionTrackingController _handleActionSelectionGestureRecognizer:] + 784
	16  UIKit                               0x000000010c19dc09 -[UIGestureRecognizerTarget _sendActionWithGestureRecognizer:] + 57
	17  UIKit                               0x000000010c1a5a07 _UIGestureRecognizerSendTargetActions + 109
	18  UIKit                               0x000000010c1a33bb _UIGestureRecognizerSendActions + 225
	19  UIKit                               0x000000010c1a267e -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 981
	20  UIKit                               0x000000010c18ee02 _UIGestureEnvironmentUpdate + 1219
	21  UIKit                               0x000000010c18e8f3 -[UIGestureEnvironment _deliverEvent:toGestureRecognizers:usingBlock:] + 484
	22  UIKit                               0x000000010c18daba -[UIGestureEnvironment _updateGesturesForEvent:window:] + 274
	23  UIKit                               0x000000010bcd9b9a -[UIWindow sendEvent:] + 4092
	24  UIKit                               0x000000010bc867b0 -[UIApplication sendEvent:] + 352
	25  UIKit                               0x000000010c469adc __dispatchPreprocessedEventFromEventQueue + 2926
	26  UIKit                               0x000000010c461a3a __handleEventQueue + 1122
	27  CoreFoundation                      0x000000010aba1c01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	28  CoreFoundation                      0x000000010ab870cf __CFRunLoopDoSources0 + 527
	29  CoreFoundation                      0x000000010ab865ff __CFRunLoopRun + 911
	30  CoreFoundation                      0x000000010ab86016 CFRunLoopRunSpecific + 406
	31  GraphicsServices                    0x000000010fd84a24 GSEventRunModal + 62
	32  UIKit                               0x000000010bc690d4 UIApplicationMain + 159
	33  MyApp                          0x00000001087453c7 main + 55
	34  libdyld.dylib                       0x000000010df3665d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Apple have responding marking the Radar a duplicate of : 16697134

Comments

Apple reply

Engineering has determined that your bug report (32508213) is a duplicate of 16697134 and will be closed.

The open or closed status of the original report your bug was duplicated to appears in a gray text box within the bug detail section of the bug reporter user interface. For security and privacy reasons, we don't provide access to the original bug yours was duped to.

By web at June 22, 2017, 9:35 a.m. (reply...)

Please note: Reports posted here will not necessarily be seen by Apple. All problems should be submitted at bugreport.apple.com before they are posted here. Please only post information for Radars that you have filed yourself, and please do not include Apple confidential information in your posts. Thank you!