Swift iAd-超过10个ADBannerView警告和CGAffineTransformInvert实例：奇异矩阵输出

Question

因此，我尝试在应用程序中设置一个简单的iAd标语，但在输出中收到以下两个警告：

WARNING: More than 10 instances of ADBannerView or ADInterstitialView 
currently exist. This is a misuse of the iAd API, and ad performance will 
suffer as a result. This message is printed only once.

和

<Error>: CGAffineTransformInvert: singular matrix.

这就是我用来实现我的ADBannerView：

var adBannerView = ADBannerView()

func loadAds() {
    adBannerView = ADBannerView(frame: CGRect.zeroRect)
    adBannerView.center = CGPoint(x: adBannerView.center.x, y: view.bounds.size.height - adBannerView.frame.size.height / 2)
    adBannerView.delegate = self
    adBannerView.hidden = true
    view.addSubview(adBannerView)
}

//BannerView did load ad
func bannerViewDidLoadAd(banner: ADBannerView!) {
    adBannerView.hidden = false
}
//BannerView failed to load
func bannerView(banner: ADBannerView!, didFailToReceiveAdWithError error: NSError!) {
    adBannerView.hidden = true
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    loadAds()
    //(rest of the code is from here onwards)

我尝试添加此代码以停止第一个错误：（无效）

//BannerView will disappear
override func viewWillDisappear(animated: Bool) {
    adBannerView.removeFromSuperview()
    adBannerView.delegate = nil
}

Answer 1

问题在于，每次加载视图时，您都会创建一个新的实例ADBannerView。我们需要做的是ADBannerView在我们的视图中创建一次AppDelegate.swift，然后ADBannerView在我们希望使用iAd横幅的任何视图上展示该视图。这也称为“
共享iAd标语”。在这个例子中，我创建了一个ADBannerView在我AppDelegate.swift，然后把它添加到我ViewController.swift的观点。

AppDelegate.swift

import UIKit
import iAd // Import iAd

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, ADBannerViewDelegate { // Include the delegate for our banner

    var window: UIWindow?
    var adBannerView = ADBannerView() // Create our one ADBannerView

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Set delegate and hide banner initially
        adBannerView.delegate = self
        adBannerView.hidden = true
        return true
    }

    func bannerViewDidLoadAd(banner: ADBannerView!) {
        print("bannerViewDidLoadAd")
        adBannerView.hidden = false
    }

    func bannerViewActionDidFinish(banner: ADBannerView!) {
        print("bannerViewActionDidFinish")
    }

    func bannerView(banner: ADBannerView!, didFailToReceiveAdWithError error: NSError!) {
        print("didFailToReceiveAdWithError: \(error)")
        adBannerView.hidden = true
    }

ViewController.swift

import UIKit

class ViewController: UIViewController {

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate // Create reference to our app delegate

    override func viewWillAppear(animated: Bool) {
        // Position
        appDelegate.adBannerView.center = CGPoint(x: view.frame.midX,
            y: view.frame.height - appDelegate.adBannerView.frame.height / 2)
        // Add to view
        view.addSubview(appDelegate.adBannerView)
    }

不要忘记从viewWillDisappear(animated: Bool)以前添加的函数中删除代码。如果您单击横幅，然后将其关闭，则将调用此函数，并且从视图中删除横幅并将横幅委托设置为nil太早会导致问题。