I've used the ComponentOne iPhone Library. It does exactly what you're looking for.
Now, in all honesty, I ran into a lot of bugs when I worked with it 2 or 3 months ago. Their components worked fine when you wanted results like what you find in their site, but as soon as I got into dynamically generating data and using AJAX to update fields, I started finding many, many bugs.
In fairness, the tool is new and that was a few months ago. Its quite possible they have worked out those bugs. Additionally, I was able to get around them (after much finagling).
Here is the Live Demo you can view from your iPhone.