Why is my interstitial Ad Producing an error? - swift

Question

I am trying to show an interstitial Ad whenever the game over scene is displayed and I am just getting in error. I have searched for answers but they produced the same result. I am using the Notification Center method and it is not working. My banner view is working just fine though.
I am getting this error:
CoreAnimation: [EAGLContext renderbufferStorage:fromDrawable:] was
called from a non-main thread in an implicit transaction! Note that
this may be unsafe without an explicit CATransaction or a call to
[CATransaction flush]. 2017-10-01 09:28:00.631015-0500
Split[868:273850] CoreAnimation: [EAGLContext
renderbufferStorage:fromDrawable:] was called from a non-main thread
in an implicit transaction! Note that this may be unsafe without an
explicit CATransaction or a call to [CATransaction flush].
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(GameViewController.loadAndShow), name: NSNotification.Name(rawValue: "loadAndShow"), object: nil)
let request = GADRequest()
request.testDevices = [kGADSimulatorID, "49d92844bdbdf74dac25e343b377744f"]
bannerView = GADBannerView(adSize: kGADAdSizeSmartBannerPortrait)
self.view?.addSubview(bannerView)
bannerView.adUnitID = "ca-app-pub-9408273734198014/6590781864"
bannerView.rootViewController = self
bannerView.load(GADRequest())
bannerView.delegate = self
interstitialView = GADInterstitial(adUnitID: "ca-app-pub-9408273734198014/7472368678")
interstitialView.load(request)
if let view = self.view as! SKView? {
// Load the SKScene from 'GameScene.sks'
if let scene = SKScene(fileNamed: "StartScene") {
// Set the scale mode to scale to fit the window
scene.scaleMode = .aspectFill
// Present the scene
view.presentScene(scene)
}
view.ignoresSiblingOrder = true
view.showsFPS = true
view.showsNodeCount = true
}
}
#objc func loadAndShow() {
interstitialView = GADInterstitial()
let request = GADRequest()
interstitialView.setAdUnitID("ca-app-pub-9408273734198014/7472368678")
interstitialView.delegate = self
interstitialView.load(request)
}
func showInterstitial(ad: GADInterstitial!) {
if (self.interstitialView.isReady) {
interstitialView.present(fromRootViewController: self)
}
}

Answer 1

So, as mentioned in error, you are calling interstitialView.present(fromRootViewController: self) in non main thread, it is called from a thread that was used to load the interstitial.
To fix it just present it in main queue.
DispatchQueue.main.async {
self.interstitialView.present(fromRootViewController: self)
}