iOS9 self.canDisplayBannerAds = true 不显示任何广告 [关闭]

标题：使用self.canDisplayBannerAds = true后却不显示广告的解决方法

swift
for subview in self.view.subviews {
    NSLog(@"%@", NSStringFromClass([subview class]));
}

swift
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDelegate.window?.rootViewController?.view.addSubview(adBannerView)

swift
import UIKit
import iAd
class ViewController: UIViewController, ADBannerViewDelegate {
    var adBannerView: ADBannerView!
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.canDisplayBannerAds = true
        self.adBannerView = ADBannerView(adType: .Banner)
        self.adBannerView.delegate = self
        
        // 添加广告视图到窗口层级
        let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
        appDelegate.window?.rootViewController?.view.addSubview(adBannerView)
    }
    
    // 广告视图加载完成
    func bannerViewDidLoadAd(banner: ADBannerView!) {
        print("广告已加载")
    }
    
    // 广告视图加载失败
    func bannerView(banner: ADBannerView!, didFailToReceiveAdWithError error: NSError!) {
        print("广告加载失败：\(error)")
    }
    
    // 其他代码
    // ...
}