iad won't move content to fit in (it covers the content) - ios

Question

I'm working on an app for both iphone/ipad all sizes. I've used the storyboard to place all the elements on screen: labels, buttons and images. Everything works perfectly. I want to place an iad at the bottom of the screen. So I places an iad from the object library and constrained it to the bottom of the screen, without constraining it to the other objects on the view. I've read that the iad has already the ability to push all content (resize) for it to fit on the screen. However when I run my app on the simulator, 6 out of 10 times the iad pushes the content up to make space for it to display. The other 4 times the iad covers the bottom label and button. It happens on all the simulator devices (5, 5s, 6, 6s, 6+ 6+s, ipad 2, ipad pro, ipad air, ipad air2, ipad retina.)
I'm using the following script to display the iad:
#IBOutlet weak var adBannerView: ADBannerView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.canDisplayBannerAds = true
self.adBannerView?.delegate = self
self.adBannerView?.hidden = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func bannerViewWillLoadAd(banner: ADBannerView!) {
}
func bannerViewDidLoadAd(banner: ADBannerView!) {
self.adBannerView?.hidden = false
}
func bannerViewActionDidFinish(banner: ADBannerView!) {
}
func bannerViewActionShouldBegin(banner: ADBannerView!, willLeaveApplication willLeave: Bool) -> Bool {
return true
}
func bannerView(banner: ADBannerView!, didFailToReceiveAdWithError error: NSError!) {
self.adBannerView?.hidden = true
}
Does anyone know or have an Idea on how to fix the problem I'm having?
Also in the apple manual it says that if iad fails to load it should be pushed offscreen. Do I need to write code to do this or will it do it automatically by its self?
iad pushes content to fit in, screen shot
iad covers the content, screen shot