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Banner ads occupy a spot within an app's layout, either at the top or bottom of the device screen. They stay on screen while users are interacting with the app, and can refresh automatically after a certain period of time. If you're new to mobile advertising, they're a great place to start. Case study.

This guide shows you how to integrate banner ads from AdMob into an iOS app. In addition to code snippets and instructions, it includes information about sizing banners properly and links to additional resources.

Prerequisites

• Complete the Get started guide.

Always test with test ads

When building and testing your apps, make sure you use test ads rather than live, production ads. Failure to do so can lead to suspension of your account.

The easiest way to load test ads is to use our dedicated test ad unit ID for iOS banners: ca-app-pub-3940256099942544/2934735716

It's been specially configured to return test ads for every request, and you're free to use it in your own apps while coding, testing, and debugging. Just make sure you replace it with your own ad unit ID before publishing your app.

For more information about how the Mobile Ads SDK's test ads work, see Test Ads.

Create a GADBannerView

Banner ads are displayed in GADBannerView objects, so the first step toward integrating banner ads is to include a GADBannerView in your view hierarchy. This is typically done either with the Interface Builder or programmatically.

Interface Builder

A GADBannerView can be added to a storyboard or xib file like any typical view. When using this method, be sure to add width and height constraints to match the ad size you'd like to display. For example, when displaying a banner (320x50), use a width constraint of 320 points, and a height constraint of 50 points.

Programmatically

A GADBannerView can also be instantiated directly. Here's an example of how to create a GADBannerView, aligned to the bottom center of the safe area of the screen, with a banner size of 320x50:

import GoogleMobileAds
import UIKit

class ViewController: UIViewController {

  var bannerView: GADBannerView!

  override func viewDidLoad() {
    super.viewDidLoad()
    
    // In this case, we instantiate the banner with desired ad size.
    bannerView = GADBannerView(adSize: GADAdSizeBanner)

    addBannerViewToView(bannerView)
  }

  func addBannerViewToView(_ bannerView: GADBannerView) {
    bannerView.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(bannerView)
    view.addConstraints(
      [NSLayoutConstraint(item: bannerView,
                          attribute: .bottom,
                          relatedBy: .equal,
                          toItem: view.safeAreaLayoutGuide,
                          attribute: .bottom,
                          multiplier: 1,
                          constant: 0),
       NSLayoutConstraint(item: bannerView,
                          attribute: .centerX,
                          relatedBy: .equal,
                          toItem: view,
                          attribute: .centerX,
                          multiplier: 1,
                          constant: 0)
      ])
   }
   
}

@import GoogleMobileAds;

@interface ViewController ()

@property(nonatomic, strong) GADBannerView *bannerView;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  
  // In this case, we instantiate the banner with desired ad size.
  self.bannerView = [[GADBannerView alloc]
      initWithAdSize:GADAdSizeBanner];

  [self addBannerViewToView:self.bannerView];
}

- (void)addBannerViewToView:(UIView *)bannerView {
  bannerView.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:bannerView];
  [self.view addConstraints:@[
    [NSLayoutConstraint constraintWithItem:bannerView
                               attribute:NSLayoutAttributeBottom
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.view.safeAreaLayoutGuide
                               attribute:NSLayoutAttributeBottom
                              multiplier:1
                                constant:0],
    [NSLayoutConstraint constraintWithItem:bannerView
                               attribute:NSLayoutAttributeCenterX
                               relatedBy:NSLayoutRelationEqual
                                  toItem:self.view
                               attribute:NSLayoutAttributeCenterX
                              multiplier:1
                                constant:0]
                                ]];
}
  


@end

Note that in this case we don't give width or height constraints, as the provided ad size will give the banner an intrinsic content size to size the view.

If you don't want to use a standard size defined by a constant, you can set a custom size using GADAdSizeFromCGSize. See the banner size section for more information.

Configure GADBannerView properties

In order to load and display ads, GADBannerView requires a few properties be set.

• rootViewController - This view controller is used to present an overlay when the ad is clicked. It should normally be set to the view controller that contains the GADBannerView.
• adUnitID - This is the ad unit ID from which the GADBannerView should load ads.

Here's a code example showing how to set the two required properties in the viewDidLoad method of a UIViewController:

override func viewDidLoad() {
  super.viewDidLoad()
  ...

  bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
  bannerView.rootViewController = self
}

- (void)viewDidLoad {
  [super viewDidLoad];
  ...

  self.bannerView.adUnitID = @"ca-app-pub-3940256099942544/2934735716";
  self.bannerView.rootViewController = self;
}

Load an ad

Once the GADBannerView is in place and its properties configured, it's time to load an ad. This is done by calling loadRequest: on a GADRequest object:

override func viewDidLoad() {
  super.viewDidLoad()
  ...

  bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
  bannerView.rootViewController = self
  bannerView.load(GADRequest())
}

- (void)viewDidLoad {
  [super viewDidLoad];
  ...

  self.bannerView.adUnitID = @"ca-app-pub-3940256099942544/2934735716";
  self.bannerView.rootViewController = self;
  [self.bannerView loadRequest:[GADRequest request]];
}

GADRequest objects represent a single ad request, and contain properties for things like targeting information.

Ad events

Through the use of GADBannerViewDelegate, you can listen for lifecycle events, such as when an ad is closed or the user leaves the app.

Registering for banner events

To register for banner ad events, set the delegate property on GADBannerView to an object that implements the GADBannerViewDelegate protocol. Generally, the class that implements banner ads also acts as the delegate class, in which case, the delegate property can be set to self.

import GoogleMobileAds
import UIKit

class ViewController: UIViewController, GADBannerViewDelegate {

  var bannerView: GADBannerView!

  override func viewDidLoad() {
    super.viewDidLoad()
    ...
    bannerView.delegate = self
  }
}

@import GoogleMobileAds;

@interface ViewController () <GADBannerViewDelegate>

@property(nonatomic, strong) GADBannerView *bannerView;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  ...
  self.bannerView.delegate = self;
}

Implementing banner events

Each of the methods in GADBannerViewDelegate is marked as optional, so you only need to implement the methods you want. This example implements each method and logs a message to the console:

func bannerViewDidReceiveAd(_ bannerView: GADBannerView) {
  print("bannerViewDidReceiveAd")
}

func bannerView(_ bannerView: GADBannerView, didFailToReceiveAdWithError error: Error) {
  print("bannerView:didFailToReceiveAdWithError: \(error.localizedDescription)")
}

func bannerViewDidRecordImpression(_ bannerView: GADBannerView) {
  print("bannerViewDidRecordImpression")
}

func bannerViewWillPresentScreen(_ bannerView: GADBannerView) {
  print("bannerViewWillPresentScreen")
}

func bannerViewWillDismissScreen(_ bannerView: GADBannerView) {
  print("bannerViewWillDIsmissScreen")
}

func bannerViewDidDismissScreen(_ bannerView: GADBannerView) {
  print("bannerViewDidDismissScreen")
}

- (void)bannerViewDidReceiveAd:(GADBannerView *)bannerView {
  NSLog(@"bannerViewDidReceiveAd");
}

- (void)bannerView:(GADBannerView *)bannerView didFailToReceiveAdWithError:(NSError *)error {
  NSLog(@"bannerView:didFailToReceiveAdWithError: %@", [error localizedDescription]);
}

- (void)bannerViewDidRecordImpression:(GADBannerView *)bannerView {
  NSLog(@"bannerViewDidRecordImpression");
}

- (void)bannerViewWillPresentScreen:(GADBannerView *)bannerView {
  NSLog(@"bannerViewWillPresentScreen");
}

- (void)bannerViewWillDismissScreen:(GADBannerView *)bannerView {
  NSLog(@"bannerViewWillDismissScreen");
}

- (void)bannerViewDidDismissScreen:(GADBannerView *)bannerView {
  NSLog(@"bannerViewDidDismissScreen");
}

See the Ad Delegate example for an implementation of banner delegate methods in the iOS API Demo app.

Swift Objective-C

Use cases

Here are some example use cases for these ad event methods.

Adding a banner to the view hierarchy once an ad is received

You may want to delay in adding a GADBannerView to the view hierarchy until after an ad is received. You can do this by listening for the bannerViewDidReceiveAd: event:

func bannerViewDidReceiveAd(_ bannerView: GADBannerView) {
  // Add banner to view and add constraints as above.
  addBannerViewToView(bannerView)
}

- (void)bannerViewDidReceiveAd:(GADBannerView *)bannerView {
  // Add bannerView to view and add constraints as above.
  [self addBannerViewToView:self.bannerView];
}

Animating a banner ad

You can also use the bannerViewDidReceiveAd: event to animate a banner ad once it's returned, as shown in the following example:

func bannerViewDidReceiveAd(_ bannerView: GADBannerView) {
  bannerView.alpha = 0
  UIView.animate(withDuration: 1, animations: {
    bannerView.alpha = 1
  })
}

- (void)bannerViewDidReceiveAd:(GADBannerView *)bannerView {
  bannerView.alpha = 0;
  [UIView animateWithDuration:1.0 animations:^{
    bannerView.alpha = 1;
  }];
}

Pausing and resuming the app

The GADBannerViewDelegate protocol has methods to notify you of events, such as when a click causes an overlay to be presented or dismissed. If you want to trace whether these events were due to ads, register for these GADBannerViewDelegate methods.

To catch all types of overlay presentations or external browser invocations, not just those that come from ad clicks, your app is better off listening for the equivalent methods on UIViewController or UIApplication. Here is a table showing the equivalent iOS methods that are invoked at the same time as GADBannerViewDelegate methods:

Banner sizes

The table below lists the standard banner sizes.

Custom ad sizes

To define a custom banner size, set your desired size using GADAdSizeFromCGSize, as shown here:

let adSize = GADAdSizeFromCGSize(CGSize(width: 300, height: 50))

GADAdSize size = GADAdSizeFromCGSize(CGSizeMake(300, 50));

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