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Prior to iOS 4, when the user pressed the Home button to leave your application, your application was terminated and unloaded from memory If that user went to the Settings and changed your application s settings, you would notice the change when loading settings NSUserDefaults in applicationDidFinishLaunchingWithOptions the next time your application launched However, any new applications that are built for iOS 4 now default to supporting a limited version of multitasking When the user presses the Home button, your application is initially only suspended If they launch your application again, iOS just resumes it where it left off If the user changed your settings while it was suspended, you will need to notice the change Fortunately, there is an easy way to watch for new settings When your settings are changed, iOS will send your application a NSUserDefaultsDidChangeNotification Register for this notification when your application initially launches and you ll be able to react to any settings changes that might occur while your application is running
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[[NSNotificationCenter defaultCenter] addObserver:self selector:selector(settingsHaveChanged) name: NSUserDefaultsDidChangeNotification object:nil]
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When your settingsHaveChanged method is called, call [notification object] to get the NSUserDefaults object
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It is important to remember that application settings are for preferences that will not change often For instance, a user s username, password, and e-mail address are not likely to change often An application s preferences are set up using the Rootplist and zero or more plists for child panes Users modify an application s preferences through the Settings application The application can access its preferences through the NSUserDefault class
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Understanding the iOS directory structure Persisting a collection as a property list Archiving an object hierarchy
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n this chapter, you learn how to persist your data to a file using properties and then how to persist your data using archiving However, before learning about these two topics, you briefly explore the iOS s file system
An iOS Application s Directory Structure
Persisting and archiving require writing data to a file, but an iOS application can only read and write to files in the application s sandbox When installed, an application is placed in its own home directory This directory is the application s root directory and should be left untouched, lest you risk corrupting your application Under the application s home directory are the directories you may write to These directories are the Documents, Preferences, Caches, and tmp directories
<application <application <application <application home home home home directory>/Documents directory>/Library/Preferences directory>/Library/Caches directory>/tmp
The Documents directory is where you should write your application s data files The Preferences directory is where your application s preferences are stored These are the preferences set through the iOS s Settings application, using the NSUserDefaults class, not preferences you might create programmatically The Caches directory, like the Documents directory, is another location you can persist files to, although, as the name implies, this directory should be reserved for caching data rather than storing an application s files The tmp directory is a temporary directory for writing files that do not need to be persisted between application launches Your application should remove files from this directory when not needed and iOS also removes files from this folder when an application is not running
Directories
You will mostly read and write from two directories: the Documents directory and the tmp directory Files you want to persist between application launches should go in the Documents directory These files are also backed up by iTunes when an iPhone, iPod touch, or iPad is synchronized with a user s computer Files placed in the tmp folder are temporary and should be deleted when an application terminates If the application does not clean the folder, iOS might delete them depending on when space is needed on your device You should never
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