NSFetchedResultsController和NSManagedObjectIDResultType崩溃

我目前正在研究一个ipad应用程序，其中使用核心数据获取大量数据。为了保持内存配置文件低，我将请求resultType设置为NSManagedObjectIDResultType，并在需要真实数据时使用-objectWithID：方法获取对象。NSFetchedResultsController和NSManagedObjectIDResultType崩溃

一切按预期工作。问题是何时从我的表视图（从上下文）添加/删除对象。那是一段代码，我在我的tableView拨打：commitEditingStyle：forRowAtIndexPath：

if(editingStyle == UITableViewCellEditingStyleDelete) 
{   

    NSManagedObjectID *ID = [fetchedResultsController objectAtIndexPath: indexPath]; 
    NSManagedObject *objectToDelete = [self.managedObjectContext objectWithID: ID]; 

     [self.managedObjectContext deleteObject: objectToDelete]; 

    [self.managedObjectContext save: nil]; 
}

这引发了我的异常：“*终止应用程序由于未捕获的异常 'NSInvalidArgumentException'，原因是：“* - [_ NSObjectID_48_0的objectID]：无法识别的选择发送到实例0x5e56900' ”

跟踪：

#0 0x9953cef6 in __kill 
#1 0x9953cee8 in kill$UNIX2003 
#2 0x995cf62d in raise 
#3 0x995e56e4 in abort 
#4 0x95826fda in __gnu_cxx::__verbose_terminate_handler 
#5 0x02d9d61c in _objc_terminate 
#6 0x9582517a in __cxxabiv1::__terminate 
#7 0x958251ba in std::terminate 
#8 0x958252b8 in __cxa_throw 
#9 0x02d9d3d8 in objc_exception_throw 
#10 0x02c84a5b in -[NSObject doesNotRecognizeSelector:] 
#11 0x02c01676 in ___forwarding___ 
#12 0x02c009f2 in __forwarding_prep_0___ 
#13 0x0281f0f7 in -[_PFBatchFaultingArray arrayFromObjectIDs] 
#14 0x0281fe4b in -[_PFMutableProxyArray managedObjectIDAtIndex:] 
#15 0x0281ec8e in -[_PFMutableProxyArray indexOfManagedObjectForObjectID:] 
#16 0x028823b8 in -[NSFetchedResultsController(PrivateMethods) _preprocessDeletedObjects:deletesInfo:sectionsWithDeletes:] 
#17 0x02885159 in -[NSFetchedResultsController(PrivateMethods) _managedObjectContextDidChange:] 
#18 0x00065586 in _nsnote_callback 
#19 0x02beb165 in _CFXNotificationPostNotification 
#20 0x0005c2ca in -[NSNotificationCenter postNotificationName:object:userInfo:] 
#21 0x027d838d in -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] 
#22 0x0283fe83 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:] 
#23 0x027b9af6 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] 
#24 0x027f4a61 in -[NSManagedObjectContext save:] 
#25 0x0035d361 in -[UITableView(UITableViewInternal) animateDeletionOfRowWithCell:] 
#26 0x00306cee in -[UIApplication sendAction:to:from:forEvent:] 
#27 0x0038043e in -[UIControl sendAction:to:forEvent:] 
#28 0x003828c0 in -[UIControl(Internal) _sendActionsForEvents:withEvent:] 
#29 0x0038146d in -[UIControl touchesEnded:withEvent:] 
#30 0x00325de8 in -[UIWindow _sendTouchesForEvent:] 
#31 0x0030b643 in -[UIApplication sendEvent:] 
#32 0x003131d8 in _UIApplicationHandleEvent 
#33 0x0351617c in PurpleEventCallback 
#34 0x02bd289c in CFRunLoopRunSpecific 
#35 0x02bd18a8 in CFRunLoopRunInMode 
#36 0x0351489d in GSEventRunModal 
#37 0x03514962 in GSEventRun 
#38 0x00311372 in UIApplicationMain 
#39 0x00002436 in main at main.m:14

我想这是与NSFetchedResultsController和NSManagedOb问题jectIDs。当我将它的委托设置为零时，它不会崩溃（即使使用空的委托方法崩溃）。

有什么想法？如果我通过观察NSManagedObjectContext通知来摆脱NSFetchedResultsController并手动执行更新，这会是一个好主意吗？

来源

2010-08-29 schmok

你使用的是iOS 5更换

[self.managedObjectContext deleteObject: objectToDelete];

？我遇到类似的崩溃，我怀疑这是一个iOS 5的错误。 – an0 2011-10-10 18:16:12

我觉得[fetchedResultsController objectAtIndexPath：indexPath];返回的不是NSManagedObjectID实例，而是NSObject的实例。

从苹果公司的文件，方法：

objectAtIndexPath：

返回在抓取结果指定索引路径的对象。

不是对象的ID，尝试注释掉或删除行：

NSManagedObject *objectToDelete = [self.managedObjectContext objectWithID: ID];

与

[self.managedObjectContext deleteObject: ID];

来源

2010-08-29 19:04:23 Leg10n

嘿谢谢你的回复。从错误我已经猜到，fetchedresultcontroller调用NSManagedObjectID实例上的objectID（它存储在fetchedresultscontroller.fetchedObjects中，但它对我没有意义。它应该是NSMangedObject类型的对象，不幸的是-deleteObjectWithID：不存在。 – schmok 2010-08-29 20:14:28

NSFetchedResultsController和NSManagedObjectIDResultType崩溃

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