November 2013
Beginner
325 pages
9h 47m
English
Content preview from Objective-C Programming: The Big Nerd Ranch Guide
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BNRAppDelegate
When Xcode created this project, it created a class named BNRAppDelegate. The “app delegate” is the starting point of an application, and every iOS application has one.
Open BNRAppDelegate.h. You can see that UIKit.h was imported by the template. UIKit is the framework that contains most of the iOS-specific classes, like UITableView, UITextField, and UIButton. Also notice that BNRAppDelegate is a subclass of UIResponder and conforms to the UIApplicationDelegate protocol.
BNRAppDelegate has one property that points to an instance of UIWindow. This object fills the screen of your iOS application. You add other objects (e.g., an instance of UIButton) to the window to create your application’s user interface.
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