我收到了一堆崩溃报告，看起来很像下面这个范围的不同值。有时范围不是0-x，可以说是2-x
应用程序特定信息： *由于未捕获的异常终止应用程序\'NSRangeException \'，原因：\'* - [NSBigMutableString substringWithRange：]：范围{0,69}超出界限;字符串长度0 \'
Last Exception Backtrace:
0 CoreFoundation 0x2e879e83 __exceptionPreprocess + 131
1 libobjc.A.dylib 0x38bd66c7 objc_exception_throw + 38
2 CoreFoundation 0x2e879dc5 +[NSException raise:format:] + 112
3 Foundation 0x2f1a1bd1 -[NSString substringWithRange:] + 120
4 UIKit 0x311b2815 -[NSTextStorage(UIKitUndoExtensions) _undoRedoAttributedSubstringFromRange:] + 132
5 UIKit 0x315d9679 -[_UITextUndoOperationTyping undoRedo] + 296
6 Foundation 0x2f296453 -[_NSUndoStack popAndInvoke] + 250
7 Foundation 0x2f2952ef -[NSUndoManager undoNestedGroup] + 454
8 UIKit 0x3127a147 -[UIApplication alertView:clickedButtonAtIndex:] + 142
9 UIKit 0x31216449 -[_UIModalItemsCoordinator _notifyDelegateModalItem:tappedButtonAtIndex:] + 144
10 UIKit 0x3121638d -[_UIModalItemAlertContentView tableView:didSelectRowAtIndexPath:] + 1000
11 UIKit 0x3111b0cb -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1078
12 UIKit 0x311ce863 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 214
13 UIKit 0x3107e781 _applyBlockToCFArrayCopiedToStack + 316
14 UIKit 0x30ff67bb _afterCACommitHandler + 430
15 CoreFoundation 0x2e844f69 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 20
16 CoreFoundation 0x2e8428f7 __CFRunLoopDoObservers + 286
17 CoreFoundation 0x2e842c43 __CFRunLoopRun + 738
18 CoreFoundation 0x2e7ad471 CFRunLoopRunSpecific + 524
19 CoreFoundation 0x2e7ad253 CFRunLoopRunInMode + 106
20 GraphicsServices 0x334e72eb GSEventRunModal + 138
21 UIKit 0x31062845 UIApplicationMain + 1136
22 MyApp 0x00071f3b main (main.m:18)
23 libdyld.dylib 0x390cfab7 start + 2
答案 0 :(得分：13)
如果您在用户编辑后设置了UITextView的文本属性，则似乎需要调用[textView.undoManager removeAllActions]来清除撤消历史记录。