Changes

Size classes are an optional feature within Interface Builder and can be turned on and off on a per storyboard file basis. Whether or not a storyboard file has size classes enabled can be verified by loading the file into the Interface Builder environment and displaying the File Inspector in the Utilities panel. Figure 24-1, for example, shows the size class and Auto Layout settings for a storyboard file:

[[Image:xcode_6_enable_size_classes.png|Enabling size classes in Xcode]]