find correct text height in for a uitableviewcell

Question

I have a table displaying different texts, therefore I need to adjust my cell height accordingly. I use the delegate method:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{
// I ask for my content string and then I want to adjust the cell accordingly:
CGSize maximumSize = CGSizeMake(defaultCell.textLabel.frame.size.width, CGFLOAT_MAX);
GSize neededSize = [contentString sizeWithFont:defaultCell.textLabel.font constrainedToSize:maximumSize lineBreakMode:defaultCell.textLabel.lineBreakMode];
CGFloat cellHeight = neededSize.height +15;
return cellHeight;

The default cell is my protoype cell of the storyboard. I initialise it in the viewDidAppear delegate method so I can access easily my protoype uitableviewcell, in this way I only have to change something like the font in my storyboard.

The Problem I have is that the function sizeWithFont: constrainedToSize: lineBreakMode: does not give me accurate answers. If there are only a few very short words in the next line it will give a result one line too low.

Does anybode have an idea why that is and how to avoid it?

Answer 1

There can be differences in the cell width when you load the view, and when it's rendered. My shot-in-the-dark would be that the cell frame you think you're working with, isn't the same cell frame that's being rendered.