我有一个带有UINavigationController的应用程序，我将工具栏设置为可见。我想显示iAds，但它们总是从屏幕的最底部弹出。我正在进行调整 - 这是一个日志：
2012-10-08 09:52:17.722 Whos Here[21330:c07] INFO showBannerView:animated:
2012-10-08 09:52:17.723 Whos Here[21330:c07] INFO layoutAnimated with ADBannerView(#c14fed0, {{0, 436}, {320, 50}}, child of UIView(#c153930)
2012-10-08 09:52:17.724 Whos Here[21330:c07] INFO layoutAnimated content frame {{0, 0}, {320, 416}}
2012-10-08 09:52:17.724 Whos Here[21330:c07] INFO layoutAnimated banner frame {{0, 436}, {320, 50}}
2012-10-08 09:52:17.724 Whos Here[21330:c07] INFO layoutAnimated shrinking content frame {{0, 0}, {320, 366}}
2012-10-08 09:52:17.725 Whos Here[21330:c07] INFO layoutAnimated shrinking banner frame {{0, 366}, {320, 50}}
我是否尝试做一些根本不正确或不好的事情（即针对HIG）？
谢谢，
史蒂夫