IOS swift 模拟器中UItextView中使用系统键盘输入汉字后立马崩溃,

问题描述

问 题

IOS swift 模拟器中UItextView中使用系统键盘输入汉字后立马崩溃,但英文没事，从别处复制粘贴的大段中文也没事，但一输入汉字又立马崩溃，跪求高手解救

Terminating app due to uncaught exception 'NSRangeException', reason: '* -[__NSCFString substringFromIndex:]: Index 2 out of bounds; string length 1'

*** First throw call stack:
(
    0   CoreFoundation                      0x0000000108864e65 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x000000010a8cadeb objc_exception_throw + 48
    2   CoreFoundation                      0x0000000108864d9d +[NSException raise:format:] + 205
    3   Foundation                          0x0000000108cf711d -[NSString substringFromIndex:] + 126
    4   艾特便签                        0x00000001066c60dd _TFCX13wtqIJFfHfgzph31CreateInformationViewController17textViewDidChangefS0_FCSo10UITextViewT_ + 509
    5   艾特便签                        0x00000001066c6a4a _TToFCX13wtqIJFfHfgzph31CreateInformationViewController17textViewDidChangefS0_FCSo10UITextViewT_ + 58
    6   UIKit                               0x0000000109d51847 -[UITextView textInputDidChange:] + 109
    7   UIKit                               0x0000000109d97cb7 -[UITextInputController _sendDelegateChangeNotificationsForText:selection:] + 138
    8   UIKit                               0x0000000109d9f751 -[UITextInputController setMarkedText:selectedRange:] + 744
    9   UIKit                               0x0000000109d505a4 -[UITextView setMarkedText:selectedRange:] + 75
    10  UIKit                               0x000000010994bc4a -[UIResponder(UITextInput_Internal) _setMarkedText:selectedRange:] + 91
    11  UIKit                               0x000000010964a2f8 -[UIKeyboardImpl unmarkText:] + 167
    12  UIKit                               0x000000010964cdf6 __59-[UIKeyboardImpl handleAcceptedCandidate:executionContext:]_block_invoke_2 + 39
    13  UIKit                               0x0000000109dba724 -[UIKeyboardTaskQueue continueExecutionOnMainThread] + 332
    14  UIKit                               0x0000000109dbaeb5 -[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] + 237
    15  UIKit                               0x0000000109654ba0 -[UIKeyboardImpl acceptCurrentCandidateForInput:] + 176
    16  UIKit                               0x0000000109a1c854 -[UIKeyboardCandidateBar collectionView:didSelectItemAtIndexPath:] + 298
    17  UIKit                               0x0000000109bf94a7 -[UICollectionView _selectItemAtIndexPath:animated:scrollPosition:notifyDelegate:] + 701
    18  UIKit                               0x0000000109c1b049 -[UICollectionView touchesEnded:withEvent:] + 574
    19  UIKit                               0x00000001095b4ef7 forwardTouchMethod + 349
    20  UIKit                               0x00000001095b4fc0 -[UIResponder touchesEnded:withEvent:] + 49
    21  UIKit                               0x00000001095b4ef7 forwardTouchMethod + 349
    22  UIKit                               0x00000001095b4fc0 -[UIResponder touchesEnded:withEvent:] + 49
    23  UIKit                               0x0000000109881ede _UIGestureRecognizerUpdate + 10279
    24  UIKit                               0x0000000109417f8a -[UIWindow _sendGesturesForEvent:] + 1137
    25  UIKit                               0x00000001094191c0 -[UIWindow sendEvent:] + 849
    26  UIKit                               0x00000001093c7b66 -[UIApplication sendEvent:] + 263
    27  UIKit                               0x00000001093a1d97 _UIApplicationHandleEventQueue + 6844
    28  CoreFoundation                      0x0000000108790a31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    29  CoreFoundation                      0x000000010878695c __CFRunLoopDoSources0 + 556
    30  CoreFoundation                      0x0000000108785e13 __CFRunLoopRun + 867
    31  CoreFoundation                      0x0000000108785828 CFRunLoopRunSpecific + 488
    32  GraphicsServices                    0x000000010ccb1ad2 GSEventRunModal + 161
    33  UIKit                               0x00000001093a7610 UIApplicationMain + 171
    34  艾特便签                        0x00000001066bb5fd main + 109
    35  libdyld.dylib                       0x000000010b4c592d start + 1
    36  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

解决方案

错误提示的很明显，substringFromIndex 操作访问越界了。你可以检查一下程序里面该部分对应的代码。

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