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didSelectViewController in AppDelegate is not called
#import "AppDelegate.h"

@interface AppDelegate()

@property (nonatomic, retain) ADBannerView *bannerView;
@property (nonatomic, assign) UIViewController<BannerViewContainer> *currentController;

@end

@implementation AppDelegate

@synthesize window = _window;
@synthesize bannerView;
@synthesize currentController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch

    CGRect screenBounds = [[UIScreen mainScreen] bounds];

    // bannerView was here

    // This is the reference to the tab bar controller and first tab from storyboard.
    UITabBarController *tabController = (UITabBarController *)self.window.rootViewController;
    self.currentController = [[tabController viewControllers] objectAtIndex:0];

    NSLog(@"Root: %@", self.window.rootViewController);
    NSLog(@"Tab with banner: %@", self.currentController);

    return YES;
}

//and this isn't called:

- (void)tabController:(UITabBarController *)tabController didSelectViewController:
(UIViewController *)viewController
{
    // If called for selection of the same tab, do nothing
    if (currentController == viewController) {
        return;
        }
    if (bannerView.bannerLoaded)  {
     // If we have a bannerView atm, tell old view controller to hide and new to show.
        [currentController hideBannerView:bannerView];
        [(UIViewController<BannerViewContainer>*)viewController showBannerView:bannerView];
        }
        // And remember this viewcontroller for the future.
    self.currentController = (UIViewController<BannerViewContainer> *)viewController;

}

// This is the reference to the tab bar controller and first tab from storyboard.
UITabBarController *tabController = (UITabBarController *)self.window.rootViewController;
tabController.delegate = self;