Please go to the link below to see the problem in action
https://i.stack.imgur.com/NpQpg.jpg
You can see the constraint for the bottom view that should make the view's bottom align with the superview's bottom doesn't work. And for both the top and bottom views, you see that their "trailing space" constraint isn't working. But it's only for the first time the superview is resized, after the app is first open.
It works perfectly in iOS 8. I'm only having problems in iOS 7.
I'm using the ECSlidingViewController, along with the MEZoomAnimationController that's a delegate for it, in order to make the slide out menu work.