I\'ve tried XCode 8 GM seed and I\'ve found out a serious issue in the Storyboard, either you use Auto Layout or disable it, Xcode 8 messes up with a UIView
You can change Simulated size of view controller from size inspector. Go to size inspector and change simulated size to Free form. You can set width and height of view as you like. To view the screen as it was in iOS 9, change width and height to 600.