//一个section刷新      
  
NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:2];      
[tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];      
  
//一个cell刷新      
  
NSIndexPath *indexPath=[NSIndexPath indexPathForRow:3 inSection:0];      
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];    
  
  
// 滚动到指定位置  
 [self.tableView reloadData];  
 NSIndexPath * dayOne = [NSIndexPath indexPathForRow:0 inSection:2];  
[self.tableView scrollToRowAtIndexPath:dayOne atScrollPosition:UITableViewScrollPositionTop animated:YES];