Question

I saw a WWDC 2010 video about NSFileProtectionComplete and protecting app’s data.

Are there any examples out there? Does any one have sample code to share?

Answer 1

See the NSFileManager class doc:

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.

It’s basically file vault for individual files. You just pass the constant when you set the file attributes.

To mark a file as protected, you must
add an extended attribute to it. The
Foundation framework includes two ways
to add this attribute:

When writing the contents of an NSData
object to disk using the
writeToFile:options:error: method,
include the
NSDataWritingFileProtectionComplete
option.

Use the
setAttributes:ofItemAtPath:error:
method of NSFileManager to add the
NSFileProtectionKey attribute (with
the NSFileProtectionComplete value) to
an existing file

.

http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/StandardBehaviors/StandardBehaviors.html