iOS-如何將GADBannerView添加到UICollectionReusableView

Question

我將我的bannerView添加到collectionView標頭中。 它不會讓我將bannerView.rootViewController設置為bannerView.rootViewController自身，因為它不是UIViewController。

我總是可以在具有collectionView的viewController中實現所需的屬性，但是如何加載bannerView？

class HeaderView: UICollectionReusableView {

    var bannerView: GADBannerView = {
        let view = GADBannerView()
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .white

        bannerView = GADBannerView(adSize: kGADAdSizeSmartBannerPortrait)

        bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
        bannerView.rootViewController = self
        bannerView.load(GADRequest())
    }
}

包含collectionView的類：

class MainViewController: UIViewController {

    var collectionView: UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // ... instantiate the collectionView
    }

    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

        let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "headerView", for: indexPath) as! HeaderView

        return headerView
    }
}

Answer 1

在headerView內部，我添加了PassthroughView ，在cellForItem內部，我將bannerView作為子視圖添加到PassthroughView。 工作正常

import GoogleMobileAds

class HeaderView: UICollectionReusableView {

    var passthroughView: PassthroughView = {
        let view = PassthroughView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.isUserInteractionEnabled = true
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .white

        // anchors for passthroughView ...
    }

    func addBannerViewToPassthroughView(_ bannerView: GADBannerView) {

        if !bannerView.isDescendant(of: passthroughView) {

            passthroughView.addSubview(bannerView)
        }
    }
}

包含collectionView並提供廣告的類位於主vc中，而不是單元中，因此我不必擔心單元回收本身並在滾動時不斷提供廣告：

class MainViewController: UIViewController {

    var collectionView: UICollectionView!

    var bannerView: GADBannerView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // ... instantiate the collectionView

        bannerView = GADBannerView(adSize: kGADAdSizeSmartBannerPortrait)
        bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
        bannerView.rootViewController = self
        bannerView.delegate = self
        bannerView.load(GADRequest())
    }

    func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

        let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "headerView", for: indexPath) as! HeaderView

        // for some strange reason adding the bannerView as a subView to the passthroughView inconsistently froze my app (sometimes it did and sometimes it didn't). Once I added it on the mainQueue everything worked fine
        DispatchQueue.main.async { [weak self] in
            if let bannerView = self?.bannerView {
                headerView.addBannerViewToPassthroughView(bannerView)
            }
        }

        return headerView
    }
}

請遵循此答案以獲取有關bannerView如何知道何時顯示在屏幕上的更多信息。