iOS7 iAd - open banner ad and closes it crashed app

Question

I have the following code in my LibraryViewController to enable iAd banner:

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];

    if (!self.canDisplayBannerAds) {
        self.canDisplayBannerAds = YES;
    }
}

iAd banner appears automatically at the bottom of the screen. I clicked the banner, ads appear fine. But when I close the ad, the app crashed with the following message:

[_UIViewControllerOneToOneTransitionContext isDescendantOfView:]: unrecognized selector sent to instance 0x166c6110

I have a mainViewController that switches view. libraryViewController.view is inserted as a subview at index 0 of the mainViewController.view .

Any idea why this happens?

Thanks in advance.

Answer 1

I have changed to using a ADBannerView and it works. If I want to show ads on the inserted subview, it is better to use ADBannerView.