Present another View Controller from SkScene - sprite-kit

Question

I'm trying to present another viewController from my "SkScene".
This is my main viewController(tuViewController)
Code:
-(void) openTweetSheet{
FacebookLikeViewDemoViewController *ctrl = [[FacebookLikeViewDemoViewController alloc] initWithNibName:#"FacebookLikeViewDemoViewController" bundle:nil];
[self presentViewController:ctrl animated:YES completion:nil];
}
This is my "SkScene":
tuViewController *viewController = [[tuViewController alloc]init];
[viewController openTweetSheet];
And the viewController which i want to present is FacebookLikeViewDemoViewController and i need to have way back to "SkScene".
And i got sigabrt error, i tried few ways to present viewController but always with failure, one time i got swap to viewController but it was entirely black. I read a lot how to perform that, but i personally can't figure out. I appreciate your help.
I tried too with Notification Center.
Main viewController
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector(goToGameOverViewController:)
name:#"GoToGameOverViewController"
object:nil];
-(void)goToGameOverViewController:(NSNotification *) notification {
FacebookLikeViewDemoViewController *helpVC = [[FacebookLikeViewDemoViewController alloc]initWithNibName:#"HelpViewController" bundle:nil];
UIViewController *rootVC = [UIApplication sharedApplication].keyWindow.rootViewController;
[rootVC presentViewController:helpVC animated:YES completion:nil];
}
SkScene
[[NSNotificationCenter defaultCenter]
postNotificationName:#"GoToGameOverViewController" object:self];
But i got the same error. I prefer to figure out why the way with notification won't work.

Answer 1

I assume by your question that you are looking to do some social media posting.
You can either pass a reference for your View Controller to your SKScene or you can use NSNotificationCenter instead. I prefer to use the latter.
First make sure you have added the Social.framework to your project.
Import the social framework into your View Controller #import <Social/Social.h>
Then in your View Controller's viewDidLoad method add this code:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(createTweet:)
name:#"CreateTweet"
object:nil];
Next add this method to your View Controller:
-(void)createTweet:(NSNotification *)notification
{
NSDictionary *tweetData = [notification userInfo];
NSString *tweetText = (NSString *)[tweetData objectForKey:#"tweetText"];
NSLog(#"%#",tweetText);
// build your tweet, facebook, etc...
SLComposeViewController *mySLComposerSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
[self presentViewController:mySLComposerSheet animated:YES completion:nil];
}
At the appropriate location in your SKScene, (won game, lost game, etc...) add this code:
NSString *tweetText = #"I just beat the last level.";
NSDictionary *userInfo = [NSDictionary dictionaryWithObject:tweetText forKey:#"tweetText"];
[[NSNotificationCenter defaultCenter] postNotificationName:#"CreateTweet" object:self userInfo:userInfo];
The above code sends a NSNotification, with text, which your View Controller will pick up and execute the specified method (which is createTweet in the above example).