iAd not working in Xcode 6 - ios

Question

I am having a problem with my code. I am trying to programmatically add an iAd to my view in Xcode. There are a few times when it randomly works, and I run it again without changing any code, and it doesn't work any more. During those few times it randomly works, when I switch to a different view and then back to the one the iAd is in, the iAd is just an empty iAd frame, not showing the animation it should be. It is simply not loading the iAd. Please Help! Code:
import UIKit
import Foundation
import iAd
class ViewController: UIViewController, ADBannerViewDelegate {
//variables*******************************************
var adBannerView = ADBannerView(frame: CGRect.zeroRect)
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.canDisplayBannerAds = true
loadAds()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//iAd**************************************************
func loadAds()
{
adBannerView = ADBannerView(frame: CGRect.zeroRect)
adBannerView.center = CGPoint(x: adBannerView.center.x, y: view.bounds.size.height - adBannerView.frame.size.height / 2 - 50)
adBannerView.delegate = self
adBannerView.hidden = true
view.addSubview(adBannerView)
}
func bannerViewWillLoadAd(banner: ADBannerView!)
{
println("sort of working1")
}
func bannerViewDidLoadAd(banner: ADBannerView!)
{
adBannerView.hidden = false
println("sort of working2")
}
func bannerViewActionDidFinish(banner: ADBannerView!)
{
println("sort of working3")
}
func bannerViewActionShouldBegin(banner: ADBannerView!, willLeaveApplication willLeave: Bool) -> Bool
{
println("sort of working4")
return true
}
func bannerView(banner: ADBannerView!, didFailToReceiveAdWithError error: NSError!)
{
adBannerView.hidden = true
println("error1")
}
}
UPDATE 1/28/15:
Somehow, the iAds work now without changing the code, but I am experiencing another problem. After I leave the view that the iAd is in, it turns into a blank white frame with the small iAd logo in the bottom corner of the frame. Also, another large problem is that it darkens the tab bar for the view with the iAd.

Answer 1

Not even the println's are working? the iAds are not always displayed, depends of the connectivity to the iAd servers, that's the reason why you should implement the didFailToReceiveAdWithError and hide the banner, in case of no information is comming from the server due to some problem.

Answer 2

If you use the automatic iAd presentation you don't need to do anything else after self.canDisplayBannerAds = true. Your view controller will automatically shrink and auto layout will be triggered when an iAd is available. The iAd will be presented at the bottom.
Thus your sample code can just be:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.canDisplayBannerAds = true
}
If you need a different behaviour here is a simple iAd example. It uses a singleton ADBannerView and can present it at the top of the view.
Anyway consider that the proper way to manually instantiate an ADBannerView is: ADBannerView(adType: ADAdType.Banner)