Swift 3 - AdMob not showing on existing View Controllers - ios

Question

I'm trying to integrate AdMob into my Swift-based app but it doesn't work no-matter what code I try.
I created a new View Controller and used the exact same code as my 'Home' controller and that seems to work, but it will not work on any of the existing ViewControllers that I have.
My current storyboard looks like this:
and my current Ad code looks like this:
import UIKit
import GoogleMobileAds
import AudioToolbox
class AdTest: UIViewController, GADBannerViewDelegate {
// Ad banner
var adMobBannerView = GADBannerView()
let ADMOB_BANNER_UNIT_ID = "ca-app-pub-9999999999"
override func viewDidLoad() {
super.viewDidLoad()
// Init AdMob banner
initAdMobBanner()
}
// MARK: - ADMOB BANNER
func initAdMobBanner() {
if UIDevice.current.userInterfaceIdiom == .phone {
// iPhone
adMobBannerView.adSize = GADAdSizeFromCGSize(CGSize(width: 320, height: 50))
adMobBannerView.frame = CGRect(x: 0, y: view.frame.size.height, width: 320, height: 50)
} else {
// iPad
adMobBannerView.adSize = GADAdSizeFromCGSize(CGSize(width: 468, height: 60))
adMobBannerView.frame = CGRect(x: 0, y: view.frame.size.height, width: 468, height: 60)
}
adMobBannerView.adUnitID = ADMOB_BANNER_UNIT_ID
adMobBannerView.rootViewController = self
adMobBannerView.delegate = self
view.addSubview(adMobBannerView)
let request = GADRequest()
adMobBannerView.load(request)
}
// Hide the banner
func hideBanner(_ banner: UIView) {
UIView.beginAnimations("hideBanner", context: nil)
banner.frame = CGRect(x: view.frame.size.width/2 - banner.frame.size.width/2, y: view.frame.size.height - banner.frame.size.height, width: banner.frame.size.width, height: banner.frame.size.height)
UIView.commitAnimations()
banner.isHidden = true
}
// Show the banner
func showBanner(_ banner: UIView) {
UIView.beginAnimations("showBanner", context: nil)
banner.frame = CGRect(x: view.frame.size.width/2 - banner.frame.size.width/2, y: view.frame.size.height - banner.frame.size.height, width: banner.frame.size.width, height: banner.frame.size.height)
UIView.commitAnimations()
banner.isHidden = false
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
My AdTest ViewController shows this:
Whereas my Home ViewController doesnt show ads at all:

Answer 1

So I found the issue, turns out that AdMob will not work if you change the global user defaults.
As a temporary fix, i've added this right before the ad is shown.
//MARK : - Load table data
UserDefaults.standard.register(defaults: ["UserAgent": "AB-" + UIDevice.current.identifierForVendor!.uuidString])
////////////
//GET CODE//
////////////
//MARK : - Load AdMob
UserDefaults.standard.register(defaults: ["UserAgent": "Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Mobile/15A372"])
initAdMobBanner()
//Set browser back so the app works
UserDefaults.standard.register(defaults: ["UserAgent": "AB-" + UIDevice.current.identifierForVendor!.uuidString])