NSKeyedArchiver archiveRootObject and NSFileProtectionComplete/NSFileProtectionCompleteUnlessOpen

Question

Is it actually possible to call NSKeyedArchiver archiveRootObject and work with data protection API setting the file attribute to NSFileProtectionComplete or NSFileProtectionCompleteUnlessOpen ?

Answer 1

First attempt to write the object to the specific location, in this case docFile (this is set to the documents directory). Then apply the file attributes to the docFile.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex: 0];
NSString* docFile = [docDir stringByAppendingPathComponent: @"Somefile.plist"];
NSError* error;    

 if([NSKeyedArchiver archiveRootObject:tempData toFile:docFile]) {

    NSDictionary *fileAttributes = [NSDictionary
                                dictionaryWithObject:NSFileProtectionComplete
                                forKey:NSFileProtectionKey];
    if([[NSFileManager defaultManager] setAttributes:fileAttributes     
                            ofItemAtPath:docFile  error: &error]) {
        NSLog(@"Success");
    }
 else {
   NSLog@(%@", error);
  }
}