Apply the spin wheel annimation

If you turn off iphone, there is a "spin wheel" animation before the screen turn off. In my app, some times the computation takes long time so I would like to show the user something indicating that the app is busy. I am thinking adding the "spin wheel" animation. Is there a easy way to do it?
Thanks,
fm

Thank you very much. It is exactly what I want. But I have another question. While the animation is going on, I would like to block all user input. How can I do it?
Thanks again.
fm

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    Message was edited by: ~Bee

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