UIView animation terminates prematurely

I'm trying to use the +[UIView animateWithDuration:animations:] method to animate a UITableViewCell's background colour from white to red. However, the colour will not animate, it immediately jumps to red. I've switched out setBackgroundColor: for setOpacity: and that works fine. What could be causing the animation to fail using background colour? Below is the code I'm u开发者_运维知识库sing:

UITableView * tableView = (UITableView *)[self view];
[UIView animateWithDuration:0.2 animations:^{
  [[tableView cellForRowAtIndexPath:
    [NSIndexPath indexPathForRow:0 inSection:0]] 
      setBackgroundColor:[UIColor redColor]];
}];

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You cannot animate changes to color properties. You will have to create two background views and fade between them using their .alpha properties.