SpriteKit- the right way to multitask

Question

I tried to search everywhere in the code:Explained documentry what it does when going to background, or if it is even paused sometime, but to no avail- can someone direct me

Answer 1

For me did not work none of one provided solutions. I did found another way how to do it.

// In the AppDelegate
- (void)applicationWillResignActive:(UIApplication *)application
{
    if ([self.window.rootViewController isKindOfClass:[GameViewController class]]) {
        GameViewController *vc = (GameViewController*)self.window.rootViewController;
        [vc pauseGame];
        [vc.view addObserver:vc
                  forKeyPath:@"paused"
                     options:NSKeyValueObservingOptionNew
                     context:nil];
    }
}

// In the GameViewController
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    SKView *skView = (SKView*)self.view;
    MainGame *mainGame = (MainGame*)skView.scene;
    if ([keyPath isEqualToString:@"paused"] &&
        [[change objectForKey:NSKeyValueChangeNewKey] boolValue] == NO &&
        [mainGame isGameInProgress]) {
        [self.view removeObserver:self forKeyPath:@"paused" context:nil];
        skView.paused = YES;
    }
}