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Saving Data to the iPhone Application Sandbox
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When your application is installed on the iPhone or the iPhone Simulator, its sandbox includes several directories. Take a look at Figure 9-3. The Library directory includes a Preferences directory where preferences are stored as plist files. The Caches directory stores cached data between runs but is not backed up when iTunes connects to the phone. The tmp directory holds temporary files while the application is running and is cleared between runs. The Documents directory contains user data. It is backed up by iTunes during a sync and restored during a restore from backup. I tend to use the Documents directory for cached data that isn t too big, like plist files, as well as data the user generates because I prefer the user to be able to use my and my clients applications directly after a restore from backup. The iTunes sync time for your application will increase the more information you store in the Documents directory, so try to avoid caching really large files there if you can help it.
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CHAPTER 9: Fake It Til You Make It: Tips and Tricks for Improving Interface Responsiveness
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Figure 9-3. iPhone application directory structure
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You can get the path to the Documents directory using this code snippet:
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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0];
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For AAPLot, you append AAPL.plist to the path stored in the documentsDirectory variable when you store the plist data file. Build and run the application while connected to the Internet. It should look about the same as before. Now disable your Internet connection and run the application again. The graph should render just as it did before using the data that was cached to disk on the first run. If the graph does not draw when you run the application without an Internet connection, you re likely reinstalling the application and overwriting the Documents folder with an empty one each time you install it. Instead of running the app using Xcode s build and run, try running the application by touching or clicking it on the phone or in the simulator without reinstalling. If your application stores more critical data, perhaps business documents, your users will appreciate having their content available to them at any time, regardless of their Internet connection status.
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You never get a second chance to make a first impression. If a user downloads your application on the App Store and then finds himself without an Internet connection the first time he uses it, having nothing to look at can be disappointing. That user may never run your application again. Many applications would benefit from having some kind of default local data, even if it is just something to show the user what it will look like when they are able to get fresh data. One fantastic application that I use often, FileMagnet from Magnetism Studios (http://www.magnetismstudios.com/FileMagnet), is a file viewer that makes it simple to synchronize files from your computer to your iPhone for viewing. They ship the application and each update with a document outlining what s new in the application. This allows a new user to experience the application in action before importing any documents while at the same time allows the veteran user see what new features are available. It s a very nice touch.
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CHAPTER 9: Fake It Til You Make It: Tips and Tricks for Improving Interface Responsiveness
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To ship a default version of the AAPL.plist with your application, you will first need to retrieve one from the simulator. The iPhone Simulator loads its library of applications and data from your home directory in ~/Library/Application Support/iPhone Simulator/User/Applications/. Each application is housed in a directory named with a UUID. The easiest way to find your AAPL.plist is to empty this directory, build and run your application, and then retrieve it from the newly created directory. The iPhone Simulator will empty the directory for you. Open the iPhone Simulator, and then select Reset Content and Settings from the iPhone Simulator menu. Make sure your Internet connection is live, and build and run the application in the simulator. You ll find AAPL.plist in the ~/Library/Application\ Support/iPhone\ Simulator/User/Applications/SOMELONGUUID/Documents/ directory. Copy it into the AAPLot code directory. Now add it as a resource in Xcode. You can set Reference Type to Default. Make sure that Add To Target is also selected so Xcode knows to copy it during the build. See Figure 9-4.
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