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iPhone: Core Data保存错误

iphonecore-datauitableview
4

当我尝试将一个对象保存到我的核心数据模型中时，出现了以下错误：

2010-09-01 22:07:50.569 Score Card[26566:207] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-1262.60.3/UITableView.m:904
2010-09-01 22:07:50.570 Score Card[26566:207] Serious application error.  Exception was caught during Core Data change processing.  This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.  Invalid update: invalid number of sections.  The number of sections contained in the table view after the update (1) must be equal to the number of sections contained in the table view before the update (1), plus or minus the number of sections inserted or deleted (1 inserted, 0 deleted). with userInfo (null)
Detected an attempt to call a symbol in system libraries that is not present on the iPhone:
_Unwind_Resume called from function -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] in image CoreData.
2010-09-01 22:07:50.572 Score Card[26566:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of sections.  The number of sections contained in the table view after the update (1) must be equal to the number of sections contained in the table view before the update (1), plus or minus the number of sections inserted or deleted (1 inserted, 0 deleted).'
*** Call stack at first throw:
(
 0   CoreFoundation                      0x02661b99 __exceptionPreprocess + 185
 1   libobjc.A.dylib                     0x027b140e objc_exception_throw + 47
 2   CoreFoundation                      0x0261a238 +[NSException raise:format:arguments:] + 136
 3   Foundation                          0x000bae37 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116
 4   UIKit                               0x0033a9a6 -[UITableView(_UITableViewPrivate) _endCellAnimationsWithContext:] + 7806
 5   UIKit                               0x0032a75b -[UITableView insertSections:withRowAnimation:] + 56
 6   Score Card                          0x00003918 -[History controller:didChangeSection:atIndex:forChangeType:] + 133
 7   CoreData                            0x0246db81 -[NSFetchedResultsController(PrivateMethods) _managedObjectContextDidChange:] + 2177
 8   Foundation                          0x0002a0e1 _nsnote_callback + 145
 9   CoreFoundation                      0x02639f29 __CFXNotificationPost_old + 745
 10  CoreFoundation                      0x025b926a _CFXNotificationPostNotification + 186
 11  Foundation                          0x0001fc8a -[NSNotificationCenter postNotificationName:object:userInfo:] + 134
 12  CoreData                            0x023a8879 -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] + 89
 13  CoreData                            0x02418193 -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:] + 259
 14  CoreData                            0x0238b208 -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] + 1352
 15  CoreData                            0x023c4e55 -[NSManagedObjectContext save:] + 149
 16  Score Card                          0x000053ad -[TimeRun saveAction] + 65
 17  Score Card                          0x00004116 -[TimeRun countDown] + 326
 18  Foundation                          0x000561c9 __NSFireTimer + 125
 19  CoreFoundation                      0x02642f73 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19
 20  CoreFoundation                      0x026445b4 __CFRunLoopDoTimer + 1364
 21  CoreFoundation                      0x025a0dd9 __CFRunLoopRun + 1817
 22  CoreFoundation                      0x025a0350 CFRunLoopRunSpecific + 208
 23  CoreFoundation                      0x025a0271 CFRunLoopRunInMode + 97
 24  GraphicsServices                    0x02f4000c GSEventRunModal + 217
 25  GraphicsServices                    0x02f400d1 GSEventRun + 115
 26  UIKit                               0x002ceaf2 UIApplicationMain + 1160
 27  Score Card                          0x00002998 main + 102
 28  Score Card                          0x00002929 start + 53
)
terminate called after throwing an instance of 'NSException

我不确定如何解决这个问题。我没有插入任何章节，所以我很困惑。有什么想法吗？

编辑：

这是否与我获取结果的方式有关？看起来我正在使用一个用于章节名称的键，但我不想要章节：

- (NSFetchedResultsController *)fetchedResultsController {

    if (fetchedResultsController != nil) {
        return fetchedResultsController;
    }

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Mission" inManagedObjectContext:managedObjectContext];
    [fetchRequest setEntity:entity];

    // Create the sort descriptors array.
    NSSortDescriptor *startDescriptor = [[NSSortDescriptor alloc] initWithKey:@"title" ascending:YES];
    NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:startDescriptor, nil];
    [fetchRequest setSortDescriptors:sortDescriptors];

    // Create and initialize the fetch results controller.
    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:@"title" cacheName:@"Root"];
    self.fetchedResultsController = aFetchedResultsController;
    self.fetchedResultsController.delegate = self;

    // Memory management.
    [aFetchedResultsController release];
    [fetchRequest release];
    [startDescriptor release];
    [sortDescriptors release];

    return fetchedResultsController;

}//end
1
如果您提供一些代码，我们将更容易地找出问题所在。 - AndersK
已更新我的方法，该方法返回了各个部分。 - Nic Hubbard
4个回答
7
如果您仍然需要一个章节名称，以下代码可行：
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
       atIndex:(NSUInteger)sectionIndex
 forChangeType:(NSFetchedResultsChangeType)type{
switch(type)
   {
    case NSFetchedResultsChangeInsert:
        [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
        break;

    case NSFetchedResultsChangeDelete:
        [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
        break;
    default:
        break; 
    }
}
我不知道这个委托方法存在，谢谢。 - Husam
3
这告诉你问题所在：
无效更新：部分数量无效。更新后表视图中包含的部分数（1）必须等于更新前表视图中包含的部分数（1），加上或减去插入或删除的部分数（插入了1个，删除了0个）。
更新后，您从'numberOfSectionsInTableView:`返回了错误的部分数。很可能是更新中的某些内容改变了部分，但您仍在返回旧的部分号码计数。
3

把sectionNameKeyPath设置为nil解决了我的问题。

0

他们说你需要在模拟器中删除应用程序，然后“清除所有构建目标”，然后重新构建和运行。希望这可以帮到你。

我基于“NSInternalInconsistencyException”来回答的。

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