Chapter 13. File Handling
WHAT YOU WILL LEARN IN THIS CHAPTER
Where your applications are stored on the iPhone
The various folders within your
How to read and write to files in the
How to use a property to store structured data
How to programmatically retrieve values stored in a property list
How to modify the values retrieved from a property list and save the changes to a file
All the applications you have developed up to this point are pretty straightforward — the application starts, performs something interesting, and ends. In Chapter 11, you saw how you can make use of the application settings feature to save the preferences of your application to a central location managed by the Settings application. Sometimes, however, you simply need to save some data to your application's folder for use later. For example, rather than keep files you download from a remote server in memory, a better (and more effective and memory efficient) method might be to save them in a file so that you can use them later (maybe even after the application has shut down and restarted).
In this chapter, you learn more about how you can persist data in your application so that you can use it later, even after the application has restarted. You learn the two available approaches: saving the data as files and as a property list.
UNDERSTANDING THE APPLICATION FOLDERS
So far, you have been busy deploying your applications onto the iPhone Simulator and have not spent much ...