Programming iOS 6, 3rd Edition

Storyboards

A storyboard (see Storyboard-Instantiated View Controller) collects, in a single file, multiple view controllers — both parent and children, both presenter and presented. Each view controller is part of a scene, analogous to a nib containing that view controller and any related top-level objects. Special connections are drawn between view controllers; these are of two kinds:

Relationship

If view controller A has view controller B as its child from the outset (as with a navigation controller and its root view controller, or a tab bar controller and its child view controllers), the connection is a relationship emanating from view controller A. View controllers connected by a relationship are instantiated together: when view controller A is instantiated, view controller B is instantiated along with it, because it is needed immediately.

To draw a relationship in a storyboard, Control-drag from a parent view controller to another view controller. If this is a built-in parent view controller type, the little HUD that appears lets you specify a “Relationship segue.” (This name is misleading, as a parent–child relationship is in no sense a segue.)

Segue

If view controller B’s view is to be replaced by view controller C’s view at some future time (as with an original presenter and a presented view controller, or a navigation controller’s child and a view controller that will later be pushed onto the stack on top of it), the connection is a segue. View controller C won’t be ...