Use container bounds instead of screen

Author: enriquez

Examples/TransitionFun/TransitionFun/MEZoomAnimationController.m

@@ -74,7 +74,7 @@ - (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionC
     UIView *containerView = [transitionContext containerView];
 
     UIView *topView = topViewController.view;
-    topView.bounds = [UIScreen mainScreen].bounds;
+    topView.frame = containerView.bounds;
 
     underLeftViewController.view.layer.transform = CATransform3DIdentity;