OS X Lion's mail expanding animation on iPhone's UITableView

Is possible to impl开发者_高级运维ement this kind of animation (Screenshot below) on UITableView when expanding a hidden group of cells/rows?

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Perhaps, but it would be quite difficult. Mail actually uses a Quartz Composer composition to implement this:

You can't use Quartz Composer on the iPhone, so you would have to do it using CALayers. See my answer here as a potential starting point, but I'm afraid it will be more trouble than it's worth.