Snippet to add to main.m in kivy-ios project

AdMob banner class for Kivy-ios

UIView *gView;
UIViewController *gViewColtroller;


@interface myBanner : NSObject <GADBannerViewDelegate>
@property (nonatomic) BOOL show_ads;
@property (strong, nonatomic) GADBannerView *gbanner;
@property (strong, nonatomic) GADRequest *request;
@end

static myBanner *vbanner = nil;

@implementation myBanner

-(id)init {
    // admob allocation
    NSLog(@"Creating google banner object");
    self.request = [GADRequest request];
    // I'm not sure this is even necessary
    self.request.testDevices = @[@"Simulator"];
    //SDLUIKitDelegate *sdldelegate = [SDLUIKitDelegate sharedAppDelegate];
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    UIViewController *rootViewController = window.rootViewController;
    
    gViewColtroller = rootViewController;//[[SDLLaunchScreenController alloc] init];
    gView = rootViewController.view; ///gViewColtroller.view;
    
    
    // Create a view of the standard size at the top of the screen.
    // Available AdSize constants are explained in GADAdSize.h.
    self.gbanner = [[GADBannerView alloc] initWithAdSize:kGADAdSizeBanner];

    [self.gbanner setDelegate:self];
    
    // Specify the ad's "unit identifier." The default ID is for Google’s test banner ad. If everything works and you see a google test ad, you have implemented everything correctly.
    self.gbanner.adUnitID = @"ca-app-pub-3940256099942544/6300978111"; // google's test id for banner ads


    
    //  ------------- Height and position of the banner ad
    //CGRect screenBounds = [[UIScreen mainScreen] bounds];
    //[self.gbanner setFrame:CGRectMake(0, 0, screenBounds.size.width, 1.5*self.gbanner.bounds.size.height)];
    //self.gbanner.center = CGPointMake(screenBounds.size.width / 2, screenBounds.size.height - (self.gbanner.bounds.size.height / 2));
    
    self.gbanner.hidden = TRUE;
    // Let the runtime know which UIViewController to restore after taking
    // the user wherever the ad goes and add it to the view hierarchy.
    self.gbanner.rootViewController = gViewColtroller;
    [gView addSubview:self.gbanner];
    
    [self.gbanner loadRequest:self.request];
    
    self.show_ads = TRUE;
    
    return self;
}

// Called before ad is shown, good time to show the add
- (void)adViewDidReceiveAd:(GADBannerView *)view
{
    NSLog(@"Admob load");
    self.gbanner.hidden = !self.show_ads;
}

// An error occurred
- (void)adView:(GADBannerView *)view didFailToReceiveAdWithError:(GADRequestError *)error
{
    NSLog(@"Admob error: %@", error);
    self.gbanner.hidden = TRUE;
}


-(void)dealloc {
    NSLog(@"Freeing ads");
    if (self.gbanner) {
        
        [self.gbanner removeFromSuperview];
        
        [self.gbanner release];
        self.gbanner.delegate = nil;
        self.gbanner = nil;
    }
    
    [super dealloc];
}


- (void)showAds:(int)ontop {
    self.show_ads = TRUE;
    
    NSLog(@"Displaying banner object ontop:%d.", ontop);
    
    CGSize AdSize = kGADAdSizeBanner.size;
    
    
    CGRect frame = self.gbanner.frame;
    frame.origin.x = (gViewColtroller.view.bounds.size.width - AdSize.width) / 2 ;
    
    if (ontop)
        frame.origin.y = 0.0f;
    else
        frame.origin.y = gViewColtroller.view.bounds.size.height - AdSize.height;
    
    self.gbanner.frame = frame;
    
}
@end


@interface adSwitch : NSObject
@end
@implementation adSwitch

-(id)init {
    if (!vbanner)
    {
        vbanner = [[myBanner alloc] init];
        
        [vbanner showAds:0];
    }
    return self;
}

-(void) show_ads {
    if (!vbanner)
        vbanner = [[myBanner alloc] init];
    
    [vbanner showAds:0];
}

-(void) hide_ads {
    if (vbanner)
    {
        
        
        [vbanner release];
        vbanner = nil;
    }
}
@end

Bottom, Top - change line 99-102
if (ontop)
frame.origin.y = gViewColtroller.view.bounds.size.height - AdSize.height;
else
frame.origin.y = 0.0f;