How to create drop shadows programmatically?

Posted by Horace Ho on Stack Overflow See other posts from Stack Overflow or by Horace Ho
Published on 2010-05-18T01:27:26Z Indexed on 2010/05/18 1:30 UTC
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In one iPhone app, I'd like to add drop shadows to a few icons dynamically (the angle of the shadow is not fixed). Is there any built-in API for this purpose? If not, how can this be done? Thanks!

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