Estoy haciendo un juego como Flappy Bird. ¿Cómo presento un UIViewController de SKScene? En primer lugar, les cuento a mis entornos.

Mac OS X 10.9Xcode 5.0.2
Sprite Kit (framework), social.framework (framework) se agregan en mi proyecto

Mi objetivo es mostrar un botón "Compartir" en Game Over. Al tocar la imagen del botón de compartir debería aparecer un SLComposeViewController (Twitter Share). El contenido de la escena no debe cambiar.
Me gustaría resolver el siguiente problema y cambiar la visualización de GameOverScene a tweetSheet (pantalla) compuesta con social.framework.

La cuestión

[self presentViewController:tweetSheet animated:YES completion:nil];
//Error:No visible @interface for 'GameOverScene' declares the selector "presentViewController":animated:completion:

Mis archivos de codificación están a continuación (extraje partes de códigos importantes).

ViewController.h

import <UIKit/UIKit.h>
import <SpriteKit/SpriteKit.h>
import <iAd/iAd.h>

@interface ViewController : UIViewController<ADBannerViewDelegate><br>

@end

GameOverScene.h

#import <SpriteKit/SpriteKit.h> 

@class SpriteViewController;

@interface GameOverScene : SKScene {
}
@end

GameOverScene.m

#import "GameOverScene.h"
#import "NewGameScene.h"
#import "MainScene.h"
#import <Social/Social.h>
@implementation GameOverScene {
   //The twitter button 
    SKSpriteNode *_twitterbutton;
}
- (id)initWithSize:(CGSize)size
{
    if (self = [super initWithSize:size]) {
        //Creating the twitterbutton with the twitterbutton image from Images.xcassets
        _twitterbutton = [SKSpriteNode spriteNodeWithImageNamed:@"twitterbutton"];
        [_twitterbutton setSize:CGSizeMake(50, 50)];
        [_twitterbutton setPosition:CGPointMake(self.size.width/2, self.size.height/5 + 50)];
        //Adding the twitter button
        [self addChild:_twitterbutton];
        //Again, this is important, otherwise we can't identify what button is pressed
        _twitterbutton.name = @"twitterbutton";
        [_twitterbutton setPosition:CGPointMake(self.size.width/2, self.size.height/5 + 50)]
    }
    return self;
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //Same as in NewGameScene menu
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];
    //Is the twitter button touched?
    if([node.name isEqualToString:@"twitterbutton"]){
        if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter]){
            SLComposeViewController *tweetSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
            [tweetSheet setInitialText:@"TestTweet from the Game !!"];
            [self presentViewController:tweetSheet animated:YES completion:nil];
     **//Error:No visible @interface for 'GameOverScene' declares the selector "presentViewController":animated:completion:**
         } 
    }

ViewControlloer.m

#import "ViewController.h"
#import "NewGameScene.h"
@implementation ViewController
//Loads the view onto our main class
- (void)loadView
{
  self.view  = [[SKView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
}
//Executes when view finishes loading
- (void)viewWillLayoutSubviews
{
  [super viewDidLoad];

  //Set the resize mode to flexible width and height
  [self.view setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];

  //Create our view from our original view
  //Make sure to leave originalContentView in, otherwise the app will crash
  SKView *skView = (SKView *)self.originalContentView;

  //We create a new NewGameScene according to the current dimensions
  SKScene *scene = [NewGameScene sceneWithSize:skView.bounds.size];

  //Create a transition class with animation type fade and a duration of .4 seconds
  SKTransition *transition = [SKTransition fadeWithDuration:.4];

  //Present the menu view (NewGameScene) with our fade in transition
  [skView presentScene:scene transition:transition];
}

@end