I am starting to learn to use UIView animation. So I wrote the following lines:

 [UIView beginAnimations:nil context:NULL];

 [UIView setAnimationDuration:2.0];
 [UIView setAnimationRepeatCount:2];
 [UIView setAnimationRepeatAutoreverses:YES];

 CGPoint position = greenView.center;
 position.y = position.y + 100.0f;
 position.x = position.x + 100.0f;
 greenView.center = position;

 [UIView commitAnimations];

In this case, the UIView (a green box) moved back and fore 2 times. So far so good, BUT I found out that after the moving twice, the green box ended up jumped to the "new position" (position.x + 100.0f, position.y + 100.0f) instead of going back to the original position (position.x, position.y). That makes the animation look pretty odd (like after the box swing back to the original position caused by setAnimationRepeatAutoreverses, it jumps back to the new position in the last microsecond!)

What is the best way to make the green box NOT jump to the new position at the very last minute?