ios - Swift iAd - 超过 10 个 ADBannerView 警告和 CGAffineTransformInvert 实例 : singular matrix output

Question

所以我尝试在我的应用程序中设置一个简单的 iAd 横幅，但我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 的东西:

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)

我尝试添加这个来阻止第一个错误:(没用)

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

Answer 1

问题是每次加载 View 时都会创建一个新的 ADBannerView 实例。我们需要做的是在我们的 AppDelegate.swift 中创建一个 ADBannerView，然后将这个 ADBannerView 呈现在我们想要的任何 View 上iAd 横幅。这也称为 Shared iAd Banner .在这个例子中，我在我的 AppDelegate.swift 中创建了一个 ADBannerView，然后将它添加到我的 ViewController.swift 的 View 中。

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)
    }

不要忘记从您之前添加的 viewWillDisappear(animated: Bool) 函数中删除代码。如果您单击横幅然后将其关闭，将调用此函数并从我们的 View 中删除我们的横幅并将我们的横幅委托(delegate)设置为 nil 过早会导致问题。