Loading iAd banner from the top

Question

I've managed to implement iAd into my app and the banner loads from the bottom, I'm unsure how to get it to load from the top instead. I've tried a number of things but I can't seem to crack it. Can anyone help please?

The code I have:

- (void)layoutAnimated:(BOOL)animated
{
    CGRect contentFrame = self.view.bounds;

    CGRect bannerFrame = self.bannerView.frame;
    if (self.bannerView.bannerLoaded) {
        contentFrame.size.height -= self.bannerView.frame.size.height;
        bannerFrame.origin.y = contentFrame.size.height;
    } else {
        bannerFrame.origin.y = contentFrame.size.height;
    }

    [UIView animateWithDuration:animated ? 0.25 : 0.0 animations:^{
        self.contentView.frame = contentFrame;
        [self.contentView layoutIfNeeded];
        self.bannerView.frame = bannerFrame;
    }];
}