uiview animation threading issue

Question

i am using two UIView animations to move the two different balls to particular position. But the timing of collision varies. First time they collide but second time first ball come first or viceversa. Can any buddy explain how to make them collide at same point using uiview animation. is it the thread processing issue of uiview animation

Answer 1

Make sure you're animating the two views in the same block, as in

 [UIView beginAnimations:nil context:nil];
      viewOne.center = CGPointMake(40,40);
      viewTwo.center = CGPointMake(80,40);
 [UIView commitAnimations];