@interface ViewController () <UADSBannerViewDelegate>​// This is the Ad Unit or Placement that will display banner ads:@property (strong) NSString* placementId;// This banner view object will be placed at the top of the screen:@property (strong, nonatomic) UADSBannerView *topBannerView;// This banner view object will be placed at the bottom of the screen:@property (strong, nonatomic) UADSBannerView *bottomBannerView;​@end​@implementation ViewController​- (void)viewDidLoad {    [super viewDidLoad];    self.placementId = @"banner";    [UnityAds initialize: @"1234567" testMode: YES initializationDelegate: self];}​// Example method for creating and loading the top banner view object:- (void)loadTopBanner{    // Instantiate a banner view object with the Ad Unit ID and size:    self.topBannerView = [[UADSBannerView alloc] initWithPlacementId: _placementId size: CGSizeMake(320, 50)];    // Set the banner delegate for event callbacks:    self.topBannerView.delegate = self;    // Add the banner view object to the view hierarchy:    [self addBannerViewToTopView:self.topBannerView];    // Load ad content to the banner view object:    [_topBannerView load];}​// Example method for creating and loading the bottom banner view object:- (void)loadBottomBanner{    self.bottomBannerView = [[UADSBannerView alloc] initWithPlacementId: _placementId size: CGSizeMake(320, 50)];    self.bottomBannerView.delegate = self;    [self addBannerViewToBottomView:self.bottomBannerView];    [_bottomBannerView load];}​// Example method for discarding the top banner view object (for example, if there's no fill):- (void)unLoadTopBanner{    // Remove the banner view object from the view hierarchy:    [self.topBannerView removeFromSuperview];    // Set it to nil:    _topBannerView = nil;}​// Example method for discarding the bottom banner view object:- (void)unLoadBottomBanner{    [self.bottomBannerView removeFromSuperview];    _bottomBannerView = nil;}​​// Example method for placing the top banner view object:- (void)addBannerViewToTopView:(UIView *)bannerView {    bannerView.translatesAutoresizingMaskIntoConstraints = NO;    [self.view addSubview:bannerView];    [self.view addConstraints:@[        [NSLayoutConstraint constraintWithItem:bannerView                                    attribute:NSLayoutAttributeTop                                    relatedBy:NSLayoutRelationEqual                                        toItem:self.topLayoutGuide                                    attribute:NSLayoutAttributeBottom                                    multiplier:1                                      constant:0],        [NSLayoutConstraint constraintWithItem:bannerView                                    attribute:NSLayoutAttributeCenterX                                    relatedBy:NSLayoutRelationEqual                                        toItem:self.view                                    attribute:NSLayoutAttributeCenterX                                    multiplier:1                                      constant:0]    ]];}​// Example method for placing the bottom banner view object:- (void)addBannerViewToBottomView: (UIView *)bannerView {    bannerView.translatesAutoresizingMaskIntoConstraints = NO;    [self.view addSubview:bannerView];    [self.view addConstraints:@[        [NSLayoutConstraint constraintWithItem:bannerView                                    attribute:NSLayoutAttributeBottom                                    relatedBy:NSLayoutRelationEqual                                        toItem:self.bottomLayoutGuide                                    attribute:NSLayoutAttributeTop                                    multiplier:1                                      constant:0],        [NSLayoutConstraint constraintWithItem:bannerView                                    attribute:NSLayoutAttributeCenterX                                    relatedBy:NSLayoutRelationEqual                                        toItem:self.view                                    attribute:NSLayoutAttributeCenterX                                    multiplier:1                                      constant:0]    ]];}​// Implement the delegate methods:#pragma mark : UADSBannerViewDelegate- (void)bannerViewDidLoad:(UADSBannerView *)bannerView {    // Called when the banner view object finishes loading an ad.    NSLog(@"Banner loaded for Ad Unit or Placement: %@", bannerView.placementId);}- (void)bannerViewDidClick:(UADSBannerView *)bannerView {    // Called when the banner is clicked.    NSLog(@"Banner was clicked for Ad Unit or Placement: %@", bannerView.placementId);}- (void)bannerViewDidLeaveApplication:(UADSBannerView *)bannerView {    // Called when the banner links out of the application.}- (void)bannerViewDidError:(UADSBannerView *)bannerView error:(UADSBannerError *)error{    // Called when an error occurs showing the banner view object.    NSLog(@"Banner encountered an error for Ad Unit or Placement: %@ with error message %@", bannerView.placementId, [error localizedDescription]);    // Note that the UADSBannerError can indicate no fill (refer to the API documentation).}@end