一个奇葩错误:Invalid update: invalid number of rows in section 0

'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0.  The number of rows contained in an existing section after the update (5) 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, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out). ’

在有添加或删除tableview一行的时候,一般报这个错的原因都是,         [tableView  deleteRowsAtIndexPaths : @[ indexPath ]   withRowAnimation : UITableViewRowAnimationFade ];

这个方法之前没有把相应的数组元素删除.

但是在这之前我明明删除了

 [ self . caseArray   removeObjectAtIndex :indexPath. row ]; 

奇怪的是只有删除最后一行的时候才崩溃报这个错.

于是认真翻译了一下:更新前后的行数必须要相等.更新后的行数是5.更新前的行数是1.

怎么删除最后一行就变成了5行呢?终于明白了.我再numberOfRowsInSection里面写了这些代码

if  (! self . caseArray  ||  self . caseArray . count  ==  0 ) {
         return   5 ;
    }
     return   self . caseArray . count ;

当数组个数为0的时候,我让行数返回了5.当然错了

注：原文来自http://www.ithao123.cn/content-1437005.html，转载请注明

类似错误（2）

在删除UITableView的section中的表格时，出现以下问题：

Terminating app due to uncaught exception Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 1.  The number of rows contained in an existing section after the update (2) must be equal to the number of rows contained in that section before the update (2), plus or minus the number of rows inserted or deleted from that section (0 inserted, 2 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

找了好久的原因，试了各种方法，发现是insertRowsAtIndexPaths 和 deleteRowsAtIndexPaths 同 numberOfRowsInSection 的关系没处理好；

如果insertRowsAtIndexPaths 和 deleteRowsAtIndexPaths后没更新Section里面的rows标识，在系统调用numberOfRowsInSection时，数据rows数量不一致，就会出错。同理增删Section也得处理好numberOfSectionsInTableView返回的结果

如果用的时NSArray或者NSDictionary来标识Section和Row数量，请在调用增删方法时更新好数据。并且在beginUpdate和 enUpdate方法中间增删操作。

一、增加单元格代码示例

[objc]  view plain copy

1. NSMutableArray *cellDatas =_cellsInSection[[NSNumber numberWithInt:section]];  
2. cellDatas[0] = @"1";  
3. cellDatas[1] = @"2";  
4. [_tvDayInfo beginUpdates];  
5. NSMutableArray *indexPaths = [NSMutableArray array];  
6. NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:section];  
7. [indexPaths addObject:indexPath];  
8. NSIndexPath *indexPath1 = [NSIndexPath indexPathForRow:1 inSection:section];  
9. [indexPaths addObject:indexPath1];  
10. [_tvDayInfo insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];  
11. [_tvDayInfo endUpdates];  

二、删除单元格代码示例

[objc]  view plain copy

1. [_tvDayInfo beginUpdates];  
2. NSMutableArray *cellDatas =_cellsInSection[[NSNumber numberWithInt:section]];  
3. [cellDatas removeAllObjects];  
4. NSMutableArray *indexPaths = [NSMutableArray array];  
5. NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:section];  
6. [indexPaths addObject:indexPath];  
7. NSIndexPath *indexPath1 = [NSIndexPath indexPathForRow:1 inSection:section];  
8. [indexPaths addObject:indexPath1];  
9. [_tvDayInfo deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];  
10. [_tvDayInfo endUpdates];  

注：原文来自http://blog.youkuaiyun.com/lvxiangan/article/details/25161157 转载请注明出处