iAdBanner未出现在iOS 7上

我在屏幕底部有一个横幅。当我在iOS 8上运行我的应用程序时，它就像一个魔咒。但当我在iOS 7上运行应用程序时，它不会出现

当我清除iADBanner的约束并仅将其放置在底部时，iADBanner会出现在两个iOS版本中，但Xcode会向我显示“缺少的约束：缺少的位置X”。如果我放置位置X，我们将返回到iOS 7上未显示iADBanner的问题

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有什么建议吗？

这是我在iOS 7和iOS 8上的工作：

在viewDidLoad中：

方法：

 - (void)bannerViewDidLoadAd:(ADBannerView *)banner {
        if (!_bannerIsVisible) {
        // If banner isn't part of view hierarchy, add it
        if (_adBanner.superview == nil) {
             [self.view addSubview:_adBanner];
         }

         [UIView beginAnimations:@"animateAdBannerOn" context:NULL];

         // Assumes the banner view is just off the bottom of the screen.
          banner.frame = CGRectOffset(banner.frame, 0, -banner.frame.size.height);

         [UIView commitAnimations];

         _bannerIsVisible = YES;
     }
 }


 - (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
 {
     NSLog(@"Failed to retrieve ad");

     if (_bannerIsVisible)
     {
         [UIView beginAnimations:@"animateAdBannerOff" context:NULL];

         // Assumes the banner view is placed at the bottom of the screen.
         banner.frame = CGRectOffset(banner.frame, 0, banner.frame.size.height);

         [UIView commitAnimations];

         _bannerIsVisible = NO;
     }
 }

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希望这有帮助

谢谢，95%是我需要的解决方案！

 - (void)bannerViewDidLoadAd:(ADBannerView *)banner {
        if (!_bannerIsVisible) {
        // If banner isn't part of view hierarchy, add it
        if (_adBanner.superview == nil) {
             [self.view addSubview:_adBanner];
         }

         [UIView beginAnimations:@"animateAdBannerOn" context:NULL];

         // Assumes the banner view is just off the bottom of the screen.
          banner.frame = CGRectOffset(banner.frame, 0, -banner.frame.size.height);

         [UIView commitAnimations];

         _bannerIsVisible = YES;
     }
 }


 - (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
 {
     NSLog(@"Failed to retrieve ad");

     if (_bannerIsVisible)
     {
         [UIView beginAnimations:@"animateAdBannerOff" context:NULL];

         // Assumes the banner view is placed at the bottom of the screen.
         banner.frame = CGRectOffset(banner.frame, 0, banner.frame.size.height);

         [UIView commitAnimations];

         _bannerIsVisible = NO;
     }
 }