ios – 一旦调用其委托方法,iAd就不会异步显示

我已经在 swift中复制了 iAdSuite with Storyboards,并且iAd在所有视图控制器上都可以正常工作,除了当调用委托方法bannerViewDidLoadAd(banner：ADBannerView！)时,横幅视图不会立即出现.我必须旋转模拟器或转到另一个标签,以便它出现.

我认为这是Objective-C中Apple示例代码的一部分,我无法“翻译”为swift？这可能导致iAd一旦加载就不会异步显示…

+ (BannerViewManager *)sharedInstance
{
    static BannerViewManager *sharedInstance = nil;
    static dispatch_once_t oncetoken;
    dispatch_once(&oncetoken,^{
        sharedInstance = [[BannerViewManager alloc] init];
    });
    return sharedInstance;
}

这是我的BannerViewManager类,带有ADBannerViewDelegate方法.

class BannerViewManager: NSObject,ADBannerViewDelegate {

    // MARK: - Shared instance
    static let sharedInstance = BannerViewManager()

    var bannerView: ADBannerView!
    var bannerViewControllers: NSMutableSet!

    override init() {
        super.init()

        bannerView = ADBannerView(adType: .Banner)
        bannerViewControllers = NSMutableSet()
        bannerView.delegate = self
    }

    func addBannerViewController(controller: BannerViewController) {
        bannerViewControllers.addobject(controller)
    }

    func removeBannerViewController(controller: BannerViewController) {
        bannerViewControllers.removeObject(controller)
    }

    // MARK: - Ad banner view delegate methods

    func bannerViewDidLoadAd(banner: ADBannerView!) {
        NSLog("bannerViewDidLoadAd")

        for bannerViewController in bannerViewControllers {
            (bannerViewController as! BannerViewController).updateLayout()
        }
    }

    func bannerView(banner: ADBannerView!,didFailToReceiveAdWithError error: NSError!) {
        NSLog("didFailToReceiveAdWithError %@",error);

        for bannerViewController in bannerViewControllers {
            (bannerViewController as! BannerViewController).updateLayout()
        }
    }

    func bannerViewActionShouldBegin(banner: ADBannerView!,willLeaveApplication willLeave: Bool) -> Bool {
        NSNotificationCenter.defaultCenter().postNotificationName(BannerViewActionWillBegin,object: self)
        return true
    }

    func bannerViewActionDidFinish(banner: ADBannerView!) {
        NSNotificationCenter.defaultCenter().postNotificationName(BannerViewActionDidFinish,object: self)
    }
}

编辑

我已设法使用this post on SO将上面的Objective-C代码转换为swift但我仍然遇到同样的问题. iAd一旦加载就不会出现.必须对视图进行某种更改才能实现,无论是旋转设备还是点击另一个选项卡等等……

所以现在我的sharedInstance看起来像这样：

static var sharedInstance: BannerViewManager {
        struct Static {
            static var oncetoken: dispatch_once_t = 0
            static var instance: BannerViewManager? = nil
        }
        dispatch_once(&Static.oncetoken) {
            Static.instance = BannerViewManager()
        }
        return Static.instance!
    }