iOS Social Sharing from SKScene in Sprite Kit

[LastLine]

've got a simple little game I'm playing with, not really for release but a learning tool for myself and SpriteKit.

I've got an app pulled together based loosely on this tutorial

http://www.raywenderlich.com/42699/spritekit-tutorial-for-beginners

On my gameover scene that is presented once the user has lost the game I have placed a node with a desire to have the user be able to tap on it to bring up a Tweet sheet to be able to share something (perhaps a score or similar)

The code I have so far is reasonably straight forward:

import "GameOverScene.h"
import "MyScene.h"
import
@implementation GameOverScene

-(id)initWithSize:(CGSize)size won:(BOOL)won { if (self = [super initWithSize:size]) {

    // 1
    self.backgroundColor = [SKColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0];

    // 2
    NSString * message;
    if (won) {
        message = @"You've killed 12,000,000 birds...now go out and see the sun again!";
    } else {
        NSInteger finalScore = [[NSUserDefaults standardUserDefaults] integerForKey:@"Result"];
        NSString *messagetoshow = [NSString stringWithFormat:@"%d", finalScore];
        NSString *finalmessage = [messagetoshow stringByAppendingString:@" Flappys eliminated..."];


        message = finalmessage;
    }

    // 3
    SKLabelNode *label = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
    label.text = message;
    label.fontSize = 40;
    label.fontColor = [SKColor blackColor];
    label.position = CGPointMake(self.size.width/2, self.size.height/2);
    [self addChild:label];

    NSString * ShareTwitter;
    ShareTwitter = @"Tweet all about it!";
    SKLabelNode *tweetButton = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
    tweetButton.text = ShareTwitter;
    tweetButton.fontColor = [SKColor blueColor];
    tweetButton.position = CGPointMake(self.size.width/2, 50);
    tweetButton.name = @"tweet";
    [self addChild:tweetButton];

    // 4
    [self runAction:
        [SKAction sequence:@[
            [SKAction waitForDuration:3.0],
            [SKAction runBlock:^{
                // 5
                SKTransition *reveal = [SKTransition flipHorizontalWithDuration:0.5];
                SKScene * myScene = [[MyScene alloc] initWithSize:self.size];
                [self.view presentScene:myScene transition: reveal];
            }]
        ]]
    ];

}
return self;
}

(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint location = [touch locationInNode:self]; SKNode *node = [self nodeAtPoint:location]; //1

if ([node.name isEqualToString:@"tweet"]) {
 //2 
//Insert Tweet stuff here

    }
}

@end

I've tried various tutorials and guides to get this working but can't find anyway to present a modal view in an SKScene. Any help is greatly appreciated.