Fixed View Size at start of zoom transition

View would have the wrong height at the begining of the transition then
it would snap to the correct height. This fixed it for me.

Author: Alan Gonzalez

Examples/TransitionFun/TransitionFun/MEZoomAnimationController.m

@@ -74,6 +74,7 @@ - (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionC
     UIView *containerView = [transitionContext containerView];
 
     UIView *topView = topViewController.view;
+    topView.bounds = [UIScreen mainScreen].bounds;
 
     underLeftViewController.view.layer.transform = CATransform3DIdentity;