Learning iOS Development: A Hands-on Guide to the Fundamentals of iOS Programming

Message-Based Navigation

So far you have used segues to navigate between scenes, including using the special exit segue. You have some control of passing data and modifying behaviors using prepareForSegue:sender:. Using UINavigationController properties and messages, you have full control. You can do things like push a new view controller to the stack, pop the current view controller, pop to the root-view controller, retrieve the array of view controllers for the current navigation stack, and even rearrange the array of view controllers.

You can use code-based messages to add an about scene to the CarValet app. Instead of adding another scene to the storyboard, you create the interface in a separate user interface resource file. In Xcode, these ...