iOS中的二级菜单及Cell的展开收起示例

 //默认选中第一行
  NSIndexPath *ip=[NSIndexPath indexPathForRow:0 inSection:0];
  [leftTable selectRowAtIndexPath:ip animated:YES scrollPosition:UITableViewScrollPositionBottom];

//specificaArr是效果图中左边的cell英国，对应的右边的数据源
//flagArr是左边对每个区的标识
for (int i = 0; i<specificArr.count; i++) {
    [flagArr addObject:@"0"];
          }

    view.tag = 100+section;
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(sectionClick:)];
    [view addGestureRecognizer:tap];

-(void)sectionClick:(UITapGestureRecognizer *)tap{
//根据tag值获取点击的区
  int index = tap.view.tag%100;
//创建可变数据，存储所点击的区的所有行的indexpath，tableview刷新区对应的行，重新设置行高
  NSMutableArray *indexArray = [[NSMutableArray alloc]init];
  NSArray *arr = specificArr[index];
  for (int i = 0; i<arr.count; i++) {
    NSIndexPath *path = [NSIndexPath indexPathForRow:i inSection:index];
    [indexArray addObject:path];
  }
  //展开
  if ([flagArr[index] isEqualToString:@"0"]) {
    [flagArr replaceObjectAtIndex:index withObject:@"1"];
    [specificTable reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationBottom];
  }else{
    [flagArr replaceObjectAtIndex:index withObject:@"0"];
    [specificTable reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationBottom];
  }
}

 if ([flagArr[indexPath.section] isEqualToString:@"0"]) {
      return 0;
    }else{
      return 96;
    }