看看reloadDataForRowIndexes:columnIndexes:方法.要更新单个单元格，应执行以下操作:

Have a look at reloadDataForRowIndexes:columnIndexes: method. To update a single cell the following should work:

[yourTable reloadDataForRowIndexes:[NSIndexSet indexSetWithIndex:row]  
                     columnIndexes:[NSIndexSet indexSetWithIndex:column]];