I simply created a project in xCode. Then I added any UI element to a view. Then I tried to resize this item to left and to right. No code, Interface Builder was used only.
I have checked with some types of projects for iOS and with UILabel and UIButton. The result is the same: when I try to resize the item from the left then it moves the parent view/viewcontroller instead.
Uncheck "Siblings and Ancestors" under Resizing Behavior in Xcode 5 Storyboard.
Voila! As such, resizing your UI elements will not cause your view controllers to move.