I haven't tried if this will get all the files but it should since you can save and read files from the library.
NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSArray *libraryContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:libraryPath error:nil];