ERROR: whose view is not in the window hierarchy. Spritekit - ios

Question

I will try to explain this best i can. Okay i am using SpriteKit in xcode5. Inside Myscene.m i have a method called:
-(void)presentViewController
{
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"MyView"];
[self.view.window.rootViewController presentViewController:vc animated:YES completion:nil];
}
Then in my NSTimeintervalUpdate method i have a code that says
if(score >= 3)
{
[self presentViewController]
}
All this code brings up the view controller i want from the storyboard like it should with no problems but in this view controller it has a button that links up back to the game. When you click the button it goes right back to the game like it should. Well during the game instead of going back to my ViewController at a score of "3" like it did the first time, it just continues to count up and provides the following error message in the log:
2014-07-12 22:40:27.710 tests[337:60b] Warning: Attempt to present <ViewController2: 0xc354e40> on <ViewController: 0x9960b80> whose view is not in the window hierarchy!
My intention is to have my game (Myscene.m) and when the game is over is to have a game over screen (ViewController). And then from this view controller i want it to have a play again button that is linked back to Myscene.m(which i simply did by making button and control and drag to the view controller that handles my SKScene) and continues to repeat process but it will only do this process once and then it fails to loop back around and instead presents the above error.
Any help appreciated thanks!

Answer 1

Don't present View Controller from SKScene directly. Use NSNotificationCenter to tell parent View Controller to present another View Controller:
In GameSceneViewController.m:
#interface GameSceneViewController
#property (nonatomic) int score;
#end
#implementation GameSceneViewController
- (void)viewDidLoad {
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(presentMyViewController:) name:#"presentMyViewController" object:nil];
}
- (void)presentMyViewController:(NSNotification *)notification {
self.score = notification.userInfo[#"score"];
[self performSegueWithIdentifier:(segue identifier) sender:nil];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:(segue identifier])
{
// Get reference to the destination view controller
MyViewController *vc = [segue destinationViewController];
// Pass any objects to the view controller here, like...
vc.score = self.score;
}
}
#end
Then in GameScene.m call:
[[NSNotificationCenter defaultCenter] postNotificationName:#"presentMyViewController" object:nil userInfo:#{"score" : self.score}];