Some of the specialised iOS&#x2F;OS X view controllers - e.g. UIImagePickerController - probably have a <i>lot</i> more than 400 lines.<p>Other classes, like NSLayoutManager, look a lot like most of a view controller. But they&#x27;re not officially a subclass of UIViewController, because they don&#x27;t link directly to a view - even though they could have been designed to.<p>Apple makes a big deal of MVC, but I sometimes wonder if <i>anyone</i> knows what MVC really is - except possibly a design pattern for generating disagreements about MVC.