how to add the animation in iphone application using open GL or coreGrapics

i am working with a customer feedback application here i am planing to add some animations like on click of next question one cloud should come n drop t开发者_如何学Pythonhe questions or some thing like that, can i do that using core graphics or should i use openGL? can any one give me some sample codes or tutorial links?

I say stay with CoreAnimation as long as you can and only use OpenGL if really need to. Most things are easily doable with CA, and you get lots of features for free (smooth animations, fading, ...).

You can do this using CAKeyFrameAnimation. You will easily find some sample of this. Try google my friend.