ios - GADInterstitial presentFromRootViewController : causes crash after app resigns from background

Question

从 admobs 显示 GADInterstitial 后我遇到了问题。

我要做的是:

使用 presentFromRootViewController 打开 GADInterstitial:

关闭它并将应用程序置于后台

等几分钟

再次打开应用

点击一个 UI 元素

现在应用程序崩溃了 SIGSEGV 错误 有理由

objc_msgSend() selector name: _setContentMargin:

.好像我的内存有问题，是新安排的什么的。它似乎现在有一个新对象，并且它没有选择器的响应器。但它只发生在我打开 GADInterstitial 一次之后。如果我没有打开 GADInterstitial，它运行没有问题。

我加载并显示了谷歌在示例中所做的插页式广告......我不知道发生了什么......

我有一个全局 UIViewController 来决定是否显示广告。如果没有，则直接将 contenViewController 包装为 ChildViewController。如果它必须显示广告，它的 childviewController 将是一个“AdViewContoller”。这会将内容包装为 ChildViewController:

所以我有以下结构:

RootViewController -> AdViewController -> ContentViewController

这是我的 AdViewController:

import UIKit
import GoogleMobileAds

let kAD_UNIT_ID_BANNER_AD: String = "ca-app-pub-3940256099942544/2934735716"
let kAD_UNIT_ID_INTERSTITIAL_AD: String = "ca-app-pub-3940256099942544/4411468910"

let kVIEW_CONTROLLER_ALLOWS_TO_SHOW_INTERSTITIAL_NOTIFICATION: String = "kviewcontrollerallowstoshowinterstitialnotification"

class AdViewController: UIViewController, GADBannerViewDelegate {


    var childController: UIViewController? {
        didSet {
            if self.childController != nil {
                self.addChildViewController(self.childController!)
            }
        }
    }
    var contentView: UIView = UIView()
    var adLayoutConstraint: NSLayoutConstraint?

    let adView: UIView = UIView();
    let gadAdView: GADBannerView = GADBannerView(adSize: kGADAdSizeSmartBannerPortrait)
    var intAdView: GADInterstitial?

    override func viewDidLoad() {
        super.viewDidLoad()

        if self.childController != nil {
            self.view.addSubview(self.childController!.view)
            self.contentView = self.childController!.view
            self.contentView.translatesAutoresizingMaskIntoConstraints = false
        }

        self.view.addSubview(self.adView)
        self.adView.translatesAutoresizingMaskIntoConstraints = false
        self.adView.backgroundColor = UIColor.blackColor()

        self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[content]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["content":self.contentView]))
        self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[ad]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["ad":self.adView]))
        self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[content][ad]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["ad":self.adView, "content":self.contentView]))
        self.adLayoutConstraint = NSLayoutConstraint(item: self.adView, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 50
        )
        self.adView.addConstraint(self.adLayoutConstraint!)

        self.adView.addSubview(self.gadAdView)
        self.gadAdView.translatesAutoresizingMaskIntoConstraints = false
        self.adView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[gad]|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: ["gad":self.gadAdView]))
        self.adView.addConstraint(NSLayoutConstraint(item: self.gadAdView, attribute: .CenterX, relatedBy: .Equal, toItem: self.adView, attribute: .CenterX, multiplier: 1, constant: 0))
        //self.adView.addConstraint(NSLayoutConstraint(item: self.gadAdView, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 320))

        gadAdView.adUnitID = kAD_UNIT_ID_BANNER_AD
        gadAdView.rootViewController = self
        gadAdView.loadRequest(GADRequest())
        gadAdView.delegate = self

        self.hideBanner()


        NSNotificationCenter.defaultCenter().addObserver(self, selector: "askedForInterstitial:", name: kVIEW_CONTROLLER_ALLOWS_TO_SHOW_INTERSTITIAL_NOTIFICATION, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "initInterstitial", name: UIApplicationDidBecomeActiveNotification, object: nil)

        // Do any additional setup after loading the view.
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
    }

    func hideBanner() -> Void {
        self.adLayoutConstraint?.constant = 0
        self.view.layoutIfNeeded()
    }
    func showBanner() -> Void {
        self.adLayoutConstraint?.constant = 50
        self.view.layoutIfNeeded()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func initInterstitial() -> Void {
        print("UIApplicationDidBecomeActiveNotification called!")
        self.intAdView = GADInterstitial(adUnitID: kAD_UNIT_ID_INTERSTITIAL_AD)
        let request = GADRequest()
        self.intAdView?.loadRequest(request)
    }


    init(subController: UIViewController) {
        super.init(nibName: nil, bundle: nil)
        self.childController = subController
        self.addChildViewController(self.childController!)
    }


    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    func adViewDidReceiveAd(bannerView: GADBannerView!) {
        self.showBanner()
    }
    func adView(bannerView: GADBannerView!, didFailToReceiveAdWithError error: GADRequestError!) {
        self.hideBanner()
    }

    func askedForInterstitial(notification:NSNotification) -> Void {
        if notification.userInfo != nil {
            if let c = notification.userInfo!["controller"] as? UIViewController {
                self.showInterstitialInController(c)
            } else {
                self.showInterstitialInController(self)
            }
        } else {
            self.showInterstitialInController(self)
        }
    }

    class func presentInterstitial() -> Void {
        AdViewController.presentInterstitialInController(nil)
    }

    class func presentInterstitialInController(c: UIViewController?) {
        if c == nil {
            NSNotificationCenter.defaultCenter().postNotificationName(kVIEW_CONTROLLER_ALLOWS_TO_SHOW_INTERSTITIAL_NOTIFICATION, object: nil)
        }
        else {
            NSNotificationCenter.defaultCenter().postNotificationName(kVIEW_CONTROLLER_ALLOWS_TO_SHOW_INTERSTITIAL_NOTIFICATION, object: nil, userInfo: ["controller": c!])
        }
    }

    private func showInterstitialInController(c: UIViewController) -> Void {
        if self.intAdView != nil && self.intAdView!.isReady {
            self.intAdView!.presentFromRootViewController(c)
        }
    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}

这个 Controller 也有一个横幅。但当我试图向你展示我的整个过程时，我认为你也必须看到这一点。
我有这两个类函数 presentInterstitial和 presentInterstitialInController层次结构中的所有 childviewcontrollers 都可以要求显示插页式广告。这很好用，但正如我所说，问题接缝发生在应用程序在后台之后。

感谢您的帮助

阿图尔

Answer 1

好的，我已经解决了...

问题不在于插页式广告，而是我为 UIApplicationDidBecomeActiveNotification 添加观察者的那一行。通知名称:

我有一个功能:

func initInterstitial() -> Void {
    print("UIApplicationDidBecomeActiveNotification called!")
    self.intAdView = GADInterstitial(adUnitID: kAD_UNIT_ID_INTERSTITIAL_AD)
    let request = GADRequest()
    self.intAdView?.loadRequest(request)
}

我添加的这个函数作为观察者

NSNotificationCenter.defaultCenter().addObserver(self, selector: "initInterstitial", name: UIApplicationDidBecomeActiveNotification, object: nil)

没有我的应用程序在第二次调用通知后崩溃。

现在，如果我将函数重命名为 createInterstital :

func createInterstitial() -> Void {
    print("UIApplicationDidBecomeActiveNotification called!")
    self.intAdView = GADInterstitial(adUnitID: kAD_UNIT_ID_INTERSTITIAL_AD)
    let request = GADRequest()
    self.intAdView?.loadRequest(request)
}

我像这样添加观察者:

NSNotificationCenter.defaultCenter().addObserver(self, selector: "createInterstitial", name: UIApplicationDidBecomeActiveNotification, object: nil)

一切工作完美...

我不知道为什么，但 NotificationCenter 似乎不喜欢包含 init 的函数。

希望这可以帮助一些人。

问候

阿图尔