Волшебная запись, удалить из UITableView «недопустимое количество строк в разделе 0 ...»

Question

Я использую Magical Record для управления моим CoreData. Когда пользователь удалит конкретную ячейку в таблице, что я делаю:

Установить флаг и удалить строку из таблицы:

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    [tableView beginUpdates]; 

    if (editingStyle == UITableViewCellEditingStyleDelete) { 
     MessageTableViewCell *cell = (MessageTableViewCell *)[tableView cellForRowAtIndexPath:indexPath]; 

     NSArray *sortedMessageID = [cell.photoDetails.message.message_id componentsSeparatedByString:@"_"]; 
     NSString *messageID = sortedMessageID[1]; 

     NSLog(@"cell.photoDetails.message.message_id: %@", cell.photoDetails.message.message_id); 
     NSLog(@"sortedMessageID: %@", sortedMessageID); 

     NSAssert(sortedMessageID[1] != nil, @"sortedMessageID[1] cannot be nil."); 
     NSAssert(messageID != nil, @"messageID cannot be nil."); 

     if (cell.photoDetails) { 
      [MagicalRecord saveWithBlockAndWait:^(NSManagedObjectContext *localContext) { 
       cell.photoDetails.message.delete_message = @YES; 
      }]; 
     } 

//  [self.dataSource removeObjectAtIndex:indexPath.row]; 
     [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; 

     [self performSelectorInBackground:@selector(deleteMessagesFromServer:) withObject:messageID]; 
    } 

    [tableView endUpdates]; 
} 

обновить сервер, какие идентификаторы для удаления, сервер отправить обратно идентификаторы, и если они совпадают, я удалить их из CoreData:

@try { 
     TreeNode *root = [TreeNode treeNode]; 
     XMLParser *parser = [[XMLParser alloc] init]; 
     root = [parser parseXMLFromData:data]; 

     if (root.key && [root.key.lowercaseString isEqualToString:@"messages"]) { 
      for (TreeNode *children in root.children) { 
       if ([children.key.lowercaseString isEqualToString:@"message"]) { 

        for (TreeNode *children2 in children.children) { 
         if ([children2.key isEqualToString:@"id"]) { 
          NSPredicate *predicate = [NSPredicate predicateWithFormat:@"message.message_id ==[c] %@", children2.leafvalue]; 

          BOOL isDelete = [CoreDataPhotoRecord MR_deleteAllMatchingPredicate:predicate]; 
          [[NSManagedObjectContext MR_defaultContext] MR_saveOnlySelfAndWait]; 
          NSLog(@"%s, isDelete: %@", __PRETTY_FUNCTION__, @(isDelete)); 
         } 
        } 
       } 
      } 

      NSLog(@"allAcceptedRecords.count: %lu", (unsigned long)[HumanResponse allAcceptedRecords].count); 
      //   NSLog(@"allAcceptedRecords.count: %lu, self.dataSource.count: %lu", 
      //     (unsigned long)[HumanResponse allAcceptedRecords].count, (unsigned long)self.dataSource.count); 
     } 
    } 
    @catch (NSException *exception) { 
     NSLog(@"%s, exception.reason: %@", __PRETTY_FUNCTION__, exception.reason); 
    } 

Дополнительный код:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    return 1; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
// return self.dataSource.count; 
    return [HumanResponse allAcceptedRecords].count; 
} 

+ (NSArray *)allAcceptedRecords 
{ 
    return [CoreDataPhotoRecord MR_findAllSortedBy:@"message.originalDate" 
             ascending:NO 
            withPredicate:[NSPredicate predicateWithFormat:@"message.delete_message == %@", @NO]]; 
} 

Edit - 1:

Вход обеспечивается:

2014-10-23 11:12:07.140 Human Response[426:94571] tableView.isEditing: 1 
2014-10-23 11:12:07.140 Human Response[426:94571] cell.photoDetails.message.message_id: m_1000075 
2014-10-23 11:12:07.141 Human Response[426:94571] sortedMessageID: (
    m, 
    1000075 
) 
2014-10-23 11:12:07.144 Human Response[426:94756] deleteMessages: userID=3&ids=1000075&mobile=0543111797 
2014-10-23 11:12:07.144 Human Response[426:94571] -[MainTableViewController tableView:numberOfRowsInSection:], count: 12 
2014-10-23 11:12:07.145 Human Response[426:94571] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit/UIKit-3318.16.14/UITableView.m:1582 
2014-10-23 11:12:07.146 Human Response[426:94571] CRASH: 
Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (12) must be equal to the number of rows contained in that section before the update (12), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out). 
2014-10-23 11:12:07.158 Human Response[426:94571] Stack Trace: 
(
    0 CoreFoundation      0x277a2c37 <redacted> + 150 
    1 libobjc.A.dylib      0x34f4dc8b objc_exception_throw + 38 
    2 CoreFoundation      0x277a2af5 <redacted> + 0 
    3 Foundation       0x28472d7f <redacted> + 90 
    4 UIKit        0x2ae2c7ef <redacted> + 8150 
    5 Human Response      0x000cd823 -[MainTableViewController tableView:commitEditingStyle:forRowAtIndexPath:] + 1802 
    6 UIKit        0x2ae445e3 <redacted> + 142 
    7 UIKit        0x2af1e025 <redacted> + 68 
    8 UIKit        0x2ac92c2b <redacted> + 70 
    9 UIKit        0x2ac92bd1 <redacted> + 44 
    10 UIKit        0x2ac7d863 <redacted> + 582 
    11 UIKit        0x2ac9263d <redacted> + 588 
    12 UIKit        0x2ac5742d <redacted> + 10268 
    13 UIKit        0x2ac8c2f1 <redacted> + 784 
    14 UIKit        0x2ac8bbcd <redacted> + 524 
    15 UIKit        0x2ac623dd <redacted> + 196 
    16 UIKit        0x2aed5c29 <redacted> + 13888 
    17 UIKit        0x2ac60e39 <redacted> + 1296 
    18 CoreFoundation      0x27769377 <redacted> + 14 
    19 CoreFoundation      0x27768787 <redacted> + 218 
    20 CoreFoundation      0x27766ded <redacted> + 772 
    21 CoreFoundation      0x276b5211 CFRunLoopRunSpecific + 476 
    22 CoreFoundation      0x276b5023 CFRunLoopRunInMode + 106 
    23 GraphicsServices     0x2eaae0a9 GSEventRunModal + 136 
    24 UIKit        0x2acc11d1 UIApplicationMain + 1440 
    25 Human Response      0x000bfc41 main + 116 
    26 libdyld.dylib      0x354cdaaf <redacted> + 2 
) 
2014-10-23 11:12:07.161 Human Response[426:94571] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (12) must be equal to the number of rows contained in that section before the update (12), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).' 
*** First throw call stack: 
(0x277a2c1f 0x34f4dc8b 0x277a2af5 0x28472d7f 0x2ae2c7ef 0xcd823 0x2ae445e3 0x2af1e025 0x2ac92c2b 0x2ac92bd1 0x2ac7d863 0x2ac9263d 0x2ac5742d 0x2ac8c2f1 0x2ac8bbcd 0x2ac623dd 0x2aed5c29 0x2ac60e39 0x27769377 0x27768787 0x27766ded 0x276b5211 0x276b5023 0x2eaae0a9 0x2acc11d1 0xbfc41 0x354cdaaf) 
libc++abi.dylib: terminating with uncaught exception of type NSException 
(lldb) 

Что я делаю неправильно?

Answer 1

Как Sebastian Wramba предложил, я изменил способ I'ms AVING контекста:

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    [tableView beginUpdates]; 

    if (editingStyle == UITableViewCellEditingStyleDelete) { 
     NSLog(@"tableView.isEditing: %@", @(tableView.isEditing)); 

     MessageTableViewCell *cell = (MessageTableViewCell *)[tableView cellForRowAtIndexPath:indexPath]; 

     NSArray *sortedMessageID = [cell.photoDetails.message.message_id componentsSeparatedByString:@"_"]; 
     NSString *messageID = sortedMessageID[1]; 

     NSLog(@"cell.photoDetails.message.message_id: %@", cell.photoDetails.message.message_id); 
     NSLog(@"sortedMessageID: %@", sortedMessageID); 

     NSAssert(sortedMessageID[1] != nil, @"sortedMessageID[1] cannot be nil."); 
     NSAssert(messageID != nil, @"messageID cannot be nil."); 


     if (cell.photoDetails) { 
      cell.photoDetails.message.delete_message = @YES; 
      [self saveContext]; 

//   [MagicalRecord saveWithBlockAndWait:^(NSManagedObjectContext *localContext) { 
//    cell.photoDetails.message.delete_message = @YES; 
//   }]; 
     } 

//  [self.dataSource removeObjectAtIndex:indexPath.row]; 
     [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; 

     [self performSelectorInBackground:@selector(deleteMessagesFromServer:) withObject:messageID]; 
    } 

    [tableView endUpdates]; 
} 

#pragma mark - Magical Records 

- (void)saveContext 
{ 
    [[NSManagedObjectContext MR_defaultContext] MR_saveToPersistentStoreAndWait]; 
}