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A recipe for making your UITableView cells smart enough to change their UILabels number of lines and cell height based on the text input to them.

branch: master
README
****** HOW TO USE ******

This is a simple project containing a UITableViewController. The controller lines to ensure that whatever content is placed as the text for the textLabel and detailTextLabel is displayed fully by setting the numberOfLines property of the labels appropriately based on the hight of the text. The controller also contains the code needed to have the height for each cell be appropriate based on the summed height of both the textLabel and detailTextLabel. Here is the meat of the project.

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }
    
	cell.textLabel.text = [[data objectAtIndex:indexPath.row] objectForKey:@"title"];
	cell.textLabel.font = [UIFont boldSystemFontOfSize:18];
	cell.textLabel.numberOfLines = ceilf([[[data objectAtIndex:indexPath.row] objectForKey:@"description"] sizeWithFont:[UIFont boldSystemFontOfSize:18] constrainedToSize:CGSizeMake(300, MAXFLOAT) lineBreakMode:UILineBreakModeWordWrap].height/20.0);
	cell.detailTextLabel.text = [[data objectAtIndex:indexPath.row] objectForKey:@"description"];
	cell.detailTextLabel.font = [UIFont systemFontOfSize:14];
	cell.detailTextLabel.numberOfLines = ceilf([[[data objectAtIndex:indexPath.row] objectForKey:@"description"] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(300, MAXFLOAT) lineBreakMode:UILineBreakModeWordWrap].height/20.0);
    
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
	
	NSString *titleString = [[data objectAtIndex:indexPath.row] objectForKey:@"title"];
	NSString *detailString = [[data objectAtIndex:indexPath.row] objectForKey:@"description"];
	CGSize titleSize = [titleString sizeWithFont:[UIFont boldSystemFontOfSize:18] constrainedToSize:CGSizeMake(300, MAXFLOAT) lineBreakMode:UILineBreakModeWordWrap];
	CGSize detailSize = [detailString sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(300, MAXFLOAT) lineBreakMode:UILineBreakModeWordWrap];
	
	return detailSize.height+titleSize.height;
}

The MIT License

Copyright (c) 2010 ELC Technologies

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
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