tvOS GameController

// Found at : https://forums.developer.apple.com/thread/25440
//  
//  GameViewController.swift  
//  testgc  
//  
//  Created by John McManus on 06/11/2015.  
//  Copyright (c) 2015 AppyAppster Limited. All rights reserved.  
//  
import UIKit  
import SpriteKit  
import GameController  
class GameViewController: UIViewController {  
    var controllerList : [GCController]!  
    var gameController : GCController!  
    override func viewDidLoad() {  
        super.viewDidLoad()  
        if let scene = GameScene(fileNamed: "GameScene") {  
            // Configure the view.  
            let skView = self.view as! SKView  
            skView.showsFPS = true  
            skView.showsNodeCount = true  
             
            / Sprite Kit applies additional optimizations to improve rendering performance */  
            skView.ignoresSiblingOrder = true  
             
            / Set the scale mode to scale to fit the window */  
            scene.scaleMode = .AspectFill  
             
            skView.presentScene(scene)  
        }  
        // Go and Get Contoller -- this assume only Siri Remote is connected  
        getControllers()  
    }  
     
    override func didReceiveMemoryWarning() {  
        super.didReceiveMemoryWarning()  
        // Release any cached data, images, etc that aren't in use.  
    }  
     
     
    func getControllers(){  
         
         
        controllerList = GCController.controllers()  
        if controllerList.count < 1 {  
            print("no controller try and attach to them")  
            attachControllers()  
        }  
         
    }  
     
    func attachControllers(){  
        print("\(__FUNCTION__)")  
        registerForGameControllerNotifications() // Setup notification when Controller is found  
        GCController.startWirelessControllerDiscoveryWithCompletionHandler({}) //Basic call to get game controllers  
         
    }  
     
     
    func registerForGameControllerNotifications() {  
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "handleControllerDidConnectNotification:", name: GCControllerDidConnectNotification, object: nil)  
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "handleControllerDidDisconnectNotification:", name: GCControllerDidDisconnectNotification, object: nil)  
    }  
     
    deinit {  
        NSNotificationCenter.defaultCenter().removeObserver(self, name: GCControllerDidConnectNotification, object: nil)  
        NSNotificationCenter.defaultCenter().removeObserver(self, name: GCControllerDidDisconnectNotification, object: nil)  
    }  
     
    @objc func handleControllerDidConnectNotification(notification: NSNotification) {  
        print("\(__FUNCTION__)")  
        // assign the gameController which is found - will break if more than 1  
        gameController = notification.object as! GCController  
        // we have a controller so go and setup handlers  
        self.setupGCEvents()  
         
    }  
     
     
    @objc func handleControllerDidDisconnectNotification(notification: NSNotification) {  
        // if a controller disconnects we should see it  
        print("\(__FUNCTION__)")  
         
    }  
     
    func setupGCEvents(){  
       //if it is a siri remote  
        if let microGamepad = self.gameController.microGamepad {  
            print("microGamepad found")  
            registermicroGamepadEvents(microGamepad)  
        }  
    }  
     
    func registermicroGamepadEvents(microGamepad :GCMicroGamepad){  
        print("\(__FUNCTION__)")  
        //setup the handlers  
        gameController.controllerPausedHandler = { [unowned self] _ in  
            self.pauseGame()  
        }  
        let buttonHandler: GCControllerButtonValueChangedHandler = {  button, _, pressed in  
            print("buttonHandler")  
        }  
        let movementHandler: GCControllerDirectionPadValueChangedHandler = {  _, xValue, yValue in  
            let displacement = float2(x: xValue, y: yValue)  
            print("displacement:\(displacement)")  
        }  
         
         
        let motionHandler :GCMotionValueChangedHandler = {(motion: GCMotion)->() in  
            print("acc:\(motion.userAcceleration)")  
            print("grav:\(motion.gravity)")  
            print("att:\(motion.attitude)") //  not currently support on tvOS  
            print("rot:\(motion.rotationRate)") //  not currently support on tvOS  
             
             
        }  
        microGamepad.buttonA.pressedChangedHandler = buttonHandler  
        microGamepad.buttonX.pressedChangedHandler = buttonHandler  
        microGamepad.allowsRotation = true  
        microGamepad.dpad.valueChangedHandler = movementHandler  
        // ignored error checking, but for example  
        gameController.motion?.valueChangedHandler = motionHandler  
    }  
     
    func pauseGame(){  
        print("\(__FUNCTION__)")  
        //Assigned to menu button  
    }  
     
}