iOS Question Loading animation or message

Hi,

I have tried on several occasions to use an animation to show loading during a long loop of operations.

However it seems as if the main thread is busy doing the actual operations and it never shows me the actual animation, or shows it at the end of the operations.

Any clues as to how i could , either start a new thread to handle the animation on a separate level, or something else i havent thought of...

Thanks.

Y.