IOS常见bug.001—'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in

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

    NSMutableArray *cellDatas =_cellsInSection[[NSNumber numberWithInt:section]];
    cellDatas[0] = @"1";
    cellDatas[1] = @"2";
    [_tvDayInfo beginUpdates];
    NSMutableArray *indexPaths = [NSMutableArray array];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:section];
    [indexPaths addObject:indexPath];
    NSIndexPath *indexPath1 = [NSIndexPath indexPathForRow:1 inSection:section];
    [indexPaths addObject:indexPath1];
    [_tvDayInfo insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
    [_tvDayInfo endUpdates];

二、删除单元格代码示例

    [_tvDayInfo beginUpdates];
    NSMutableArray *cellDatas =_cellsInSection[[NSNumber numberWithInt:section]];
    [cellDatas removeAllObjects];
    NSMutableArray *indexPaths = [NSMutableArray array];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:section];
    [indexPaths addObject:indexPath];
    NSIndexPath *indexPath1 = [NSIndexPath indexPathForRow:1 inSection:section];
    [indexPaths addObject:indexPath1];
    [_tvDayInfo deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
    [_tvDayInfo endUpdates];