How dynamically change UITableViewCell size for the last cell - iphone

Question

I have a UITableView with 16-20 cells inside with dynamic cell size. When a cell expands it self it should also move itself to the top of the screen. I did that using "UITableView setContentOffset" method. It works well except for the last cell in table, it's not able to move itself to the top.
I tried altering the frame & content size of UITableView but none of those were working for me!
Any Idea?
[UPDATE]
Here is a part of code: (it's inside the UITableViewCell, so self is pointing to current cell)
HomeViewController *tempViewController = (HomeViewController *) delegate;
UIView *commentField;
/*Skipping lines of codes manipulating commentField */
//Adding a subview to current cell which needs more space
[self addSubview:commentField];
//Expanding cellSize to EXPANDED_CELL_HEIGHT
//ViewController has access to cell size property and using that to determine each cell size.
[self setCellSize:(EXPANDED_CELL_HEIGHT)];
//Reloading UITableView to reflect the cell size change with animation
[[tempViewController tableView] beginUpdates];
[[tempViewController tableView] endUpdates];
[[tempViewController tableView] setContentOffset:CGPointMake(0, self.frame.origin.y) animated:YES];
and in my view controller (as I said earlier) I'm getting cellSize form cell itself
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [(BaseTableViewCell *)[cellContainer objectAtIndex:indexPath.row] cellSize];
}

Answer 1

You can change the height of the cell using the tableview delegate method heightForRowAtIndexPath: When indexPath.row equals your last row, return the height you would like.
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row == i)//i being whatever row index you want to change
{
return 60.0;//or float size you want
}
else
{
return 30.0;
}
}
Or you can just modify the bounds of the cell inside willDisplayCell:. If your using a custom tableview cell, just shrink the subviews to whatever frame you'd like and make the cell background clear etc.