How get User's Freinds list that contain Username and ids using Facebook iOS SDK 4.0

I'm trying to Fetch User's friends List. my last working Code that i implement in FacebookSDK 3.12 is now of No use because facbook have changed all their classes and even deleted old Classes, below is my old Code:

#pragma mark - Facebook Methods -
-(void)initiateFacebookSessionIfNot
{
    if (FBSession.activeSession.isOpen)
    {
        [self getUserFriendsIds];
    } else
    {
        NSArray *permissions = [[NSArray alloc] initWithObjects:
                                @"user_birthday",@"friends_hometown",
                                @"friends_birthday",@"friends_location",
                                nil];
        [FBSession openActiveSessionWithReadPermissions:permissions allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState status,NSError *error)
         {
             if (error) {
                 NSString *alertMessage, *alertTitle;

                 if (error.fberrorShouldNotifyUser) {
                     alertTitle = @"Something Went Wrong";
                     alertMessage = error.fberrorUserMessage;
                 } else if (error.fberrorCategory == FBErrorCategoryUserCancelled) {
                     NSLog(@"user cancelled login");
                 } else {
                     // For simplicity, this sample treats other errors blindly.
                     alertTitle  = @"Unknown Error";
                     alertMessage = @"Error. Please try again later.";
                     NSLog(@"Unexpected error:%@", error);
                 }

                 if (alertMessage)
                 {
                     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:alertTitle
                                                                     message:error.fberrorUserMessage
                                                                    delegate:nil
                                                           cancelButtonTitle:@"OK"
                                                           otherButtonTitles:nil];
                     [alert show];
                 }
             } else if (FB_ISSESSIONOPENWITHSTATE(status)) {
                 [self getUserFriendsIds];
             }
         }];
    }
}
-(void)getUserFriendsIds
{
    FBRequest *friendRequest = [FBRequest requestForGraphPath:@"me/friends?fields=name,username"];
    [ friendRequest startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
        NSMutableArray *fbFriendIDs;
        NSMutableArray *fbFriendsName;
        NSMutableArray *fbFriendsUserName;

        NSMutableArray *data = [[NSMutableArray alloc]initWithArray:[result objectForKey:@"data"]];
        [data enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
            if (!(NSDictionary*)obj[@"username"]) {

                NSDictionary *newDictionary =@{@"id": (NSDictionary*)obj[@"id"],
                                               @"name": (NSDictionary*)obj[@"name"],
                                               @"username": @"0"
                                               };
                [data replaceObjectAtIndex:idx withObject:newDictionary];
            }
        }];

        fbFriendsUserName = [[NSMutableArray alloc]initWithArray:[data valueForKeyPath:@"@unionOfObjects.username"]];
        fbFriendsName = [[NSMutableArray alloc]initWithArray:[data valueForKeyPath:@"@unionOfObjects.name"]];
        fbFriendIDs = [[NSMutableArray alloc]initWithArray:[data valueForKeyPath:@"@unionOfObjects.id"]];

        NSDictionary *queryDictionary =
        @{@"user_id": userObj.user_id,
          @"friend_ids":[fbFriendIDs componentsJoinedByString:@","],
          @"names":[fbFriendsName componentsJoinedByString:@","],
          @"usernames":[fbFriendsUserName componentsJoinedByString:@","]
          };

        [[RequestHandler sharedClient] CheckFBFriendsWithDictionary:queryDictionary WithCompletionBlock:^(NSArray *TUNFriendsArray, NSArray *FBFriendsArray, NSString *errorMessage) {
            if (!errorMessage) {

                tunFriendsArray = [[NSMutableArray alloc]initWithArray:TUNFriendsArray];
//                fbFriendsArray = [[NSMutableArray alloc]initWithArray:FBFriendsArray];

                [_facebookTableView reloadData];
            }
            else{
                [ApplicationUtilities ShowAlertViewWithTitle:APP_NAME Message:errorMessage];
            }
        }];
    }];
    [SVProgressHUD dismiss];
}