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我尝试调用managedObjectContext上的save方法时出现以下错误。管理对象上下文删除,然后保存对象引发objc_exception_throw错误
#0 0x939214e6 in objc_exception_throw
#1 0x01ded83b in -[NSObject doesNotRecognizeSelector:]
#2 0x01d84676 in ___forwarding___
#3 0x01d606c2 in __forwarding_prep_0___
#4 0x01c618b6 in -[NSFetchedResultsController(PrivateMethods) _managedObjectContextDidChange:]
#5 0x0003263a in _nsnote_callback
#6 0x01d4f005 in _CFXNotificationPostNotification
#7 0x0002fef0 in -[NSNotificationCenter postNotificationName:object:userInfo:]
#8 0x01bc217d in -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:]
#9 0x01c21763 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:]
#10 0x01ba65ea in -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:]
#11 0x01bdc728 in -[NSManagedObjectContext save:]
我做了一些改动OrderItem的实体来到这个下面的代码,在这里我想取消任何插入之前OrderItem的
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; [fetchRequest setEntity:[NSEntityDescription entityForName:@"OrderItem" inManagedObjectContext:managedObjectContext]]; NSArray *deleteItems = [managedObjectContext executeFetchRequest:fetchRequest error:&error]; for (id item in deleteItems) [managedObjectContext deleteObject:item]; if (![managedObjectContext save:&error]){ NSLog(@"deleting OrderItem failed: %@, %@", error, [error userInfo]); return FALSE; }
上线时出现错误[managedObjectContext保存:&错误]不去NSLog,但引发异常。
我在做什么错?有人告诉我如何,请?
如果您有警告,您必须清除这些警告,因为这些警告之一可能导致您的问题。任何答案都不能以警告作为可能的问题。 – 2010-02-23 20:26:50
您好Marcus,我还没有想出如何解决这个错误。你对这个问题有一些提示,或者你需要我提供更多信息才能给出答案? – 2010-02-23 21:02:28