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copied!<p>From the <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html" rel="noreferrer">NSFileManager</a> class doc:</p> <blockquote> <p>The file is stored in an encrypted format on disk and cannot be read from or written to while the device is locked or booting.</p> </blockquote> <p>You just pass the constant when you set the file attributes.</p> <blockquote> <p>When writing the contents of an NSData object to disk using the writeToFile:options:error: method, include the NSDataWritingFileProtectionComplete option.</p> <p>Use the setAttributes:ofItemAtPath:error: method of NSFileManager to add the NSFileProtectionKey attribute (with the NSFileProtectionComplete value) to an existing file</p> </blockquote> <p><a href="http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/StandardBehaviors/StandardBehaviors.html" rel="noreferrer">http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/StandardBehaviors/StandardBehaviors.html</a></p> <p><strong>EDIT (Determining the Availability of Protected Files)</strong></p> <p>A protected file is accessible only when a device is unlocked. Because applications may continue running while a device is locked, your code should be prepared to handle the possibility of protected files becoming unavailable at any time. The UIKit framework provides ways to track whether data protection is currently enabled.</p> <pre><code>* The application delegate can implement the applicationProtectedDataWillBecomeUnavailable: and applicationProtectedDataDidBecomeAvailable: methods and use them to track changes to the availability of protected data. * An application can register for the UIApplicationProtectedDataWillBecomeUnavailable and UIApplicationProtectedDataDidBecomeAvailable notifications. * The protectedDataAvailable property of the shared UIApplication object indicates whether protected files are currently accessible. </code></pre> <p>Any application that works with protected files should implement the application delegate methods. When the applicationProtectedDataWillBecomeUnavailable: method is called, your application should immediately close any protected files and refrain from using them again until the applicationProtectedDataDidBecomeAvailable: method is called. Any attempts to access the protected files while they are unavailable will fail. </p>

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