AppDelegate.swift

func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> UIInterfaceOrientationMask {
        
        if self.window?.rootViewController?.presentedViewController is SecondViewController {
            
            let secondController = self.window!.rootViewController!.presentedViewController as! SecondViewController
            
            if secondController.isPresented { // Check current controller state
                return UIInterfaceOrientationMask.All;
            } else {
                return UIInterfaceOrientationMask.Portrait;
            }
        } else {
            return UIInterfaceOrientationMask.Portrait;
        }
        
    }