Application Settings and User Defaults
All but the simplest computer programs today have a preferences window where the user can set application-specific options. On OS X, you’ll usually find a Preferences… menu item in an application’s menu. Selecting it brings up a window where the user can enter and change various options. The iPhone and iPad have a dedicated application called Settings, which you no doubt have played with any number of times. In this chapter, we’ll show you how to add settings for your iOS application to the Settings application and how to access those settings from within your application.