How come iPhone Interface Builder doesn't let me set the X,Y coordinates of a top-level UIView?

Question

How come the iPhone Interface Builder doesn't let me set the X,Y coordinates of a top-level UIView? (Meaning, a view whose direct parent is a UIViewController.) The X and Y boxes on the View Size tab are grayed out. I can change the X,Y values in code at runtime, so why not in the Interface Builder?

Thanks.

Answer 1

Because the view owned by a UIViewController fills the available space in its parent. Its parent will be either a UIWindow or the view controlled by something like a UINavigationController or UITabBarController. It will position the view for you. If you want to control the position of a view, make it a subview of the view controlled by your UIViewController.