ios 5:无效更新:节中的行数无效

Question

我只在iOS 5上有这个问题，在iOS 6 上没有问题

这是我的日志

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 3.  The number of rows contained in an existing section after the update (3) must be equal to the number of rows contained in that section before the update (1), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

我的代码

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return [[dictionary allKeys] count];
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSArray *keyArray = [dictionary allKeys];
    return [[dictionary objectForKey:[keyArray objectAtIndex:section]] count];
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
=    if (editingStyle == UITableViewCellEditingStyleDelete)
    {
        //First get all the keys of dictionary into one array
        NSArray *sectionsArray = [dictionary allKeys];
        //Get all the data of tapped section into one array by using indexpath.section
        NSMutableArray *objectsAtSection = [dictionary objectForKey:[sectionsArray objectAtIndex:indexPath.section]];
        //remove the particular object by using indexPath.row from the array
        [objectsAtSection removeObjectAtIndex:indexPath.row];
        // Update dictionary
        [table beginUpdates];
        // Either delete some rows within a section (leaving at least one) or the entire section.
        if ([objectsAtSection count] > 0)
        {
            [dictionary setObject:objectsAtSection forKey:[sectionsArray objectAtIndex:indexPath.section]];
            // Section is not yet empty, so delete only the current row.
            // Delete row using the cool literal version of [NSArray arrayWithObject:indexPath]
            [table deleteRowsAtIndexPaths:@[indexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
        }else{
            [dictionary removeObjectForKey:[sectionsArray objectAtIndex:indexPath.section]];
            // Section is now completely empty, so delete the entire section.
            [table deleteSections:[NSIndexSet indexSetWithIndex:indexPath.section]
                     withRowAnimation:UITableViewRowAnimationFade];
        }
        [table endUpdates];
    }
}

在iOS5中，删除了一些行和部分后，我遇到了这个问题。

你能帮帮我吗？

Answer 1

需要添加

[self.tableView reloadData];

和

self.editing = YES;

这是必要的，因为表视图最初没有关于其数据源和委托的信息；如果创建了一个表视图，则在初始化过程中总是需要向它发送一条reloadData消息。

希望它能帮助你

Answer 2

好吧，我似乎找到了答案。请参阅此SO问答，解释为什么使用allKeys方法不好。

只要你不在字典中添加或删除任何元素，它们就会保持相同的顺序，但一旦添加或删除元素，新的顺序就会完全不同。