Google AdMob Smart Banner (iOS)

import UIKit
import GoogleMobileAds

class ViewController: UIViewController {

    let bannerView: GADBannerView = GADBannerView.init(adSize: kGADAdSizeSmartBannerPortrait)

    override func viewDidLoad() {
        super.viewDidLoad()

        setupAdBanner()

    }

    // Mark: Google Ad's
    func setupAdBanner() {
        // set the banner orientation when the view loads
        let currentDevice: UIDevice = UIDevice.current
        let orientation: UIDeviceOrientation = currentDevice.orientation

        if orientation.isLandscape {
            setBannerOrientation(portrait: false)
        }

        // Load an ad in the usual way
        print("Google Mobile Ads SDK version: " + GADRequest.sdkVersion())
        bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
        bannerView.rootViewController = self
        bannerView.load(GADRequest())

        self.bannerView.translatesAutoresizingMaskIntoConstraints = false

        // create contraints to centre the add and pin to the bottom of the view
        let xConstraint = NSLayoutConstraint(item: bannerView, attribute: .centerX,
                                             relatedBy: .equal, toItem: self.view, attribute: .centerX, multiplier: 1, constant: 0)

        let pinBottom = NSLayoutConstraint(item: bannerView, attribute: .bottom,
                                           relatedBy: .equal, toItem: self.view, attribute: .bottom, multiplier: 1, constant: 0)

        // must add to sub view prior to adding constraints
        self.view.addSubview(bannerView)

        self.view.addConstraint(xConstraint)
        self.view.addConstraint(pinBottom)
    }

    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {

        super.viewWillTransition(to: size, with: coordinator)

        // detect orientation change and adjust banner accordinly
        if UIDevice.current.orientation.isLandscape {
            setBannerOrientation(portrait: false)
        } else {
            setBannerOrientation(portrait: true)
        }
    }

    func setBannerOrientation( portrait: Bool ){
        if portrait {
            self.bannerView.adSize = kGADAdSizeSmartBannerPortrait;
        } else {
            // Landscape
            self.bannerView.adSize = kGADAdSizeSmartBannerLandscape;
        }
    }
}
                    

View full project in GitHub