NSUndoManager處於無效狀態

通過Aaron Hillegass的書Cocoa Programming for Mac OS X（第三版），我現在在第9章，在Adding Undo to RaiseMan的末尾。 Hillegass告訴你添加兩種方法到你的班級MyDocument，然後構建應用程序以查看撤消/重做是否已添加並正在工作。NSUndoManager處於無效狀態

但是，它不工作（爲什麼我會在這裏？）。它說：

2012-11-27 19:55:16.231 RaiseMan[293:a0f] HIToolbox: ignoring exception 'undo: NSUndoManager 0x100188a30 is in invalid state, undo was called with too many nested undo groups' that raised inside Carbon event dispatch 
(
    0 CoreFoundation      0x00007fff88c26784 __exceptionPreprocess + 180 
    1 libobjc.A.dylib      0x00007fff858ddf03 objc_exception_throw + 45 
    2 CoreFoundation      0x00007fff88c265a7 +[NSException raise:format:arguments:] + 103 
    3 CoreFoundation      0x00007fff88c26534 +[NSException raise:format:] + 148 
    4 Foundation       0x00007fff86fd0e17 -[NSUndoManager undo] + 239 
    5 AppKit        0x00007fff8976eeda -[NSApplication sendAction:to:from:] + 95 
    6 AppKit        0x00007fff8979346a -[NSMenuItem _corePerformAction] + 365 
    7 AppKit        0x00007fff897931d4 -[NSCarbonMenuImpl performActionWithHighlightingForItemAtIndex:] + 121 
    8 AppKit        0x00007fff89a18cf4 -[NSMenu _internalPerformActionForItemAtIndex:] + 35 
    9 AppKit        0x00007fff898ca9e9 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 136 
    10 AppKit        0x00007fff8977599c NSSLMMenuEventHandler + 321 
    11 HIToolbox       0x00007fff83d937f7 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1002 
    12 HIToolbox       0x00007fff83d92d46 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 395 
    13 HIToolbox       0x00007fff83db0a81 SendEventToEventTarget + 45 
    14 HIToolbox       0x00007fff83ddfc35 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueEventRef + 387 
    15 HIToolbox       0x00007fff83e0ca0a SendMenuCommandWithContextAndModifiers + 56 
    16 HIToolbox       0x00007fff83e0c9c2 SendMenuItemSelectedEvent + 101 
    17 HIToolbox       0x00007fff83e0c8d2 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 150 
    18 HIToolbox       0x00007fff83dedc27 _ZL14MenuSelectCoreP8MenuData5PointdjPP13OpaqueMenuRefPt + 467 
    19 HIToolbox       0x00007fff83ded37c _HandleMenuSelection2 + 453 
    20 AppKit        0x00007fff89646851 _NSHandleCarbonMenuEvent + 236 
    21 AppKit        0x00007fff8961a362 _DPSNextEvent + 1908 
    22 AppKit        0x00007fff89619801 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155 
    23 AppKit        0x00007fff895df68f -[NSApplication run] + 395 
    24 AppKit        0x00007fff895d83b0 NSApplicationMain + 364 
    25 RaiseMan       0x000000010000160a main + 33 
    26 RaiseMan       0x0000000100001218 start + 52 
    27 ???         0x0000000000000001 0x0 + 1 
)

在控制檯，當我點擊撤消或按cmd + z。

我在網上找到了解決方案，但都是關於'UndoGroups'或類似的東西。
我知道例外是關於nested undo groups，但我不使用它們（AFAIK），我甚至不知道它們是什麼。

我不知道我應該給什麼其他的信息，所以請在代碼片段等

來源

2012-11-27 11684

對於未來的讀者評論問：

Hillegass告訴你添加2種方法：-insertObject:inEmployeesAtIndex:和-removeObjectFromEmployeesAtIndex: 。在第二種方法中，你需要做的：

NSUndoManager *undo = [self undoManager]; 
[[undo prepareWithInvocationTarget:self] insertObject:p inEmployeesAtIndex:index];

但我確實：

NSUndoManager *undo = [self undoManager]; 
[[undo prepareWithInvocationTarget:self] insertObject:p atIndex:index]; //atIndex: instead of inEmployeesAtIndex:

來源

2012-11-27 19:17:14 11684

NSUndoManager處於無效狀態

回答

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