Animating only part of a UIView drawn context?

I am drawing some text and images to a view in the "DrawRect" method. I wish to understand :

1. does my drawings are separated objects?
2. i know how to animate UIViews but how do i reach one of them so i can animate his properties ?
开发者_开发百科

thanks

shani

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O.k

if any one wants to know the answer. you can not animate drawn text or objects unless you draw it to CALayer.