展示系统定义的原生广告格式
加载原生广告后，您的应用会通过 GADAdLoaderDelegate 协议消息之一接收原生广告对象。然后，就由您的应用负责展示广告了，尽管不一定要立即展示广告。
为了更轻松地展示系统定义的广告格式，SDK 提供了一些实用资源。
GADNativeAdView
对于 GADNativeAd，有一个对应的“广告视图”类：GADNativeAdView。此广告视图类是 UIView，供发布商用来展示广告。例如，单个 GADNativeAdView 可以展示 GADNativeAd 的单个实例。用于展示该广告素材资源的每个 UIView 对象都应为 GADNativeAdView 对象的子视图。
例如，如果您在 UITableView 中展示广告，则其中一个单元格的视图层次结构可能如下所示：
GADNativeAdView 类还提供了注册每项素材资源所用视图时会用到的 IBOutlets，并提供了一个用于注册 GADNativeAd 对象本身的方法。如果以这种方式注册视图，SDK 就可以自动处理诸如以下任务：
- 记录点击次数。
- 记录展示次数（当第一个像素出现在屏幕上时）。
- 显示广告选择叠加层。
“广告选择”叠加层
对于通过 Ad Manager 补余广告、Ad Exchange 或 AdSense 投放的非直销原生广告，SDK 会添加一个广告选择叠加层。请在原生广告视图中任选您喜欢的一角留出空间，用于展示自动插入的广告选择徽标。此外，在将广告选择叠加层放置在广告内容上时，请确保该图标不会被遮挡，让用户一眼就能看到。 如需详细了解此叠加层的外观和功能，请参阅程序化原生广告植入指南。
程序化原生广告的广告标示
在展示程序化原生广告时，您必须展示广告标示，以指明该视图是广告。 如需了解详情，请参阅我们的政策指南。代码示例
我们来了解一下如何使用从 xib 文件动态加载的视图来展示原生广告。此方法非常适合使用经过配置的 GADAdLoaders 请求多种广告格式的情况。
布置 UIView
第一步是布置展示原生广告素材资源的 UIViews。与创建任何其他 xib 文件时一样，您可以在 Interface Builder 中执行此操作。原生广告的布局方式可能如下所示：
请注意图片右上角的自定义类值。该值设置为
GADNativeAdView。这是用于显示 GADNativeAd 的广告视图类。
此外，您还需要为 GADMediaView 设置自定义类，用于显示广告视频或图片。
将输出口与视图相关联
在视图设置完毕并已给布局分配适当的广告视图类后，请将广告视图的素材资源输出口与创建的 UIViews 关联起来。以下是将广告视图的素材资源输出口与为广告创建的 UIViews 相关联的方法：
在输出口面板中，GADNativeAdView 中的输出口已与 Interface Builder 中所列的 UIViews 相关联。这使 SDK 可以了解哪个 UIView 显示哪个素材资源。同时请务必注意，这些输出口表示广告中可点击的视图。
展示广告
完成布局并关联输出口后，向应用添加以下代码，以便在加载广告后进行展示：
Swift
// Mark: - GADNativeAdLoaderDelegate
func adLoader(_ adLoader: GADAdLoader, didReceive nativeAd: GADNativeAd) {
print("Received native ad: \(nativeAd)")
refreshAdButton.isEnabled = true
// Create and place ad in view hierarchy.
let nibView = Bundle.main.loadNibNamed("NativeAdView", owner: nil, options: nil)?.first
guard let nativeAdView = nibView as? GADNativeAdView else {
return
}
setAdView(nativeAdView)
// Set ourselves as the native ad delegate to be notified of native ad events.
nativeAd.delegate = self
// Populate the native ad view with the native ad assets.
// The headline and mediaContent are guaranteed to be present in every native ad.
(nativeAdView.headlineView as? UILabel)?.text = nativeAd.headline
nativeAdView.mediaView?.mediaContent = nativeAd.mediaContent
// This app uses a fixed width for the GADMediaView and changes its height to match the aspect
// ratio of the media it displays.
if let mediaView = nativeAdView.mediaView, nativeAd.mediaContent.aspectRatio > 0 {
let heightConstraint = NSLayoutConstraint(
item: mediaView,
attribute: .height,
relatedBy: .equal,
toItem: mediaView,
attribute: .width,
multiplier: CGFloat(1 / nativeAd.mediaContent.aspectRatio),
constant: 0)
heightConstraint.isActive = true
}
// These assets are not guaranteed to be present. Check that they are before
// showing or hiding them.
(nativeAdView.bodyView as? UILabel)?.text = nativeAd.body
nativeAdView.bodyView?.isHidden = nativeAd.body == nil
(nativeAdView.callToActionView as? UIButton)?.setTitle(nativeAd.callToAction, for: .normal)
nativeAdView.callToActionView?.isHidden = nativeAd.callToAction == nil
(nativeAdView.iconView as? UIImageView)?.image = nativeAd.icon?.image
nativeAdView.iconView?.isHidden = nativeAd.icon == nil
(nativeAdView.starRatingView as? UIImageView)?.image = imageOfStars(
fromStarRating: nativeAd.starRating)
nativeAdView.starRatingView?.isHidden = nativeAd.starRating == nil
(nativeAdView.storeView as? UILabel)?.text = nativeAd.store
nativeAdView.storeView?.isHidden = nativeAd.store == nil
(nativeAdView.priceView as? UILabel)?.text = nativeAd.price
nativeAdView.priceView?.isHidden = nativeAd.price == nil
(nativeAdView.advertiserView as? UILabel)?.text = nativeAd.advertiser
nativeAdView.advertiserView?.isHidden = nativeAd.advertiser == nil
// For the SDK to process touch events properly, user interaction should be disabled.
nativeAdView.callToActionView?.isUserInteractionEnabled = false
// Associate the native ad view with the native ad object. This is
// required to make the ad clickable.
// Note: this should always be done after populating the ad views.
nativeAdView.nativeAd = nativeAd
}
SwiftUI
创建视图模型
创建一个用于加载原生广告并发布原生广告数据更改的视图模型：
import GoogleMobileAds
class NativeAdViewModel: NSObject, ObservableObject, GADNativeAdLoaderDelegate {
@Published var nativeAd: GADNativeAd?
private var adLoader: GADAdLoader!
func refreshAd() {
adLoader = GADAdLoader(
adUnitID: "ca-app-pub-3940256099942544/3986624511",
// The UIViewController parameter is optional.
rootViewController: nil,
adTypes: [.native], options: nil)
adLoader.delegate = self
adLoader.load(GADRequest())
}
func adLoader(_ adLoader: GADAdLoader, didReceive nativeAd: GADNativeAd) {
// Native ad data changes are published to its subscribers.
self.nativeAd = nativeAd
nativeAd.delegate = self
}
func adLoader(_ adLoader: GADAdLoader, didFailToReceiveAdWithError error: Error) {
print("\(adLoader) failed with error: \(error.localizedDescription)")
}
}
创建 UIViewRepresentable
为 GADNativeView 创建 UIViewRepresentable，并订阅 ViewModel 类中的数据更改：
private struct NativeAdView: UIViewRepresentable {
typealias UIViewType = GADNativeAdView
// Observer to update the UIView when the native ad value changes.
@ObservedObject var nativeViewModel: NativeAdViewModel
func makeUIView(context: Context) -> GADNativeAdView {
return
Bundle.main.loadNibNamed(
"NativeAdView",
owner: nil,
options: nil)?.first as! GADNativeAdView
}
func updateUIView(_ nativeAdView: GADNativeAdView, context: Context) {
guard let nativeAd = nativeViewModel.nativeAd else { return }
// Each UI property is configurable using your native ad.
(nativeAdView.headlineView as? UILabel)?.text = nativeAd.headline
nativeAdView.mediaView?.mediaContent = nativeAd.mediaContent
(nativeAdView.bodyView as? UILabel)?.text = nativeAd.body
(nativeAdView.iconView as? UIImageView)?.image = nativeAd.icon?.image
(nativeAdView.starRatingView as? UIImageView)?.image = imageOfStars(from: nativeAd.starRating)
(nativeAdView.storeView as? UILabel)?.text = nativeAd.store
(nativeAdView.priceView as? UILabel)?.text = nativeAd.price
(nativeAdView.advertiserView as? UILabel)?.text = nativeAd.advertiser
(nativeAdView.callToActionView as? UIButton)?.setTitle(nativeAd.callToAction, for: .normal)
// For the SDK to process touch events properly, user interaction should be disabled.
nativeAdView.callToActionView?.isUserInteractionEnabled = false
// Associate the native ad view with the native ad object. This is required to make the ad
// clickable.
// Note: this should always be done after populating the ad views.
nativeAdView.nativeAd = nativeAd
}
将视图添加到视图层次结构
以下代码演示了如何将 UIViewRepresentable 添加到视图层次结构：
struct NativeContentView: View {
// Single source of truth for the native ad data.
@StateObject private var nativeViewModel = NativeAdViewModel()
var body: some View {
ScrollView {
VStack(spacing: 20) {
NativeAdView(nativeViewModel: nativeViewModel) // Updates when the native ad data changes.
.frame(minHeight: 300) // minHeight determined from xib.
Objective-C
#pragma mark GADNativeAdLoaderDelegate implementation
- (void)adLoader:(GADAdLoader *)adLoader didReceiveNativeAd:(GADNativeAd *)nativeAd {
NSLog(@"Received native ad: %@", nativeAd);
self.refreshButton.enabled = YES;
// Create and place ad in view hierarchy.
GADNativeAdView *nativeAdView =
[[NSBundle mainBundle] loadNibNamed:@"NativeAdView" owner:nil options:nil].firstObject;
[self setAdView:nativeAdView];
// Set the mediaContent on the GADMediaView to populate it with available
// video/image asset.
nativeAdView.mediaView.mediaContent = nativeAd.mediaContent;
// Populate the native ad view with the native ad assets.
// The headline is present in every native ad.
((UILabel *)nativeAdView.headlineView).text = nativeAd.headline;
// These assets are not guaranteed to be present. Check that they are before
// showing or hiding them.
((UILabel *)nativeAdView.bodyView).text = nativeAd.body;
nativeAdView.bodyView.hidden = nativeAd.body ? NO : YES;
[((UIButton *)nativeAdView.callToActionView)setTitle:nativeAd.callToAction
forState:UIControlStateNormal];
nativeAdView.callToActionView.hidden = nativeAd.callToAction ? NO : YES;
((UIImageView *)nativeAdView.iconView).image = nativeAd.icon.image;
nativeAdView.iconView.hidden = nativeAd.icon ? NO : YES;
((UIImageView *)nativeAdView.starRatingView).image = [self imageForStars:nativeAd.starRating];
nativeAdView.starRatingView.hidden = nativeAd.starRating ? NO : YES;
((UILabel *)nativeAdView.storeView).text = nativeAd.store;
nativeAdView.storeView.hidden = nativeAd.store ? NO : YES;
((UILabel *)nativeAdView.priceView).text = nativeAd.price;
nativeAdView.priceView.hidden = nativeAd.price ? NO : YES;
((UILabel *)nativeAdView.advertiserView).text = nativeAd.advertiser;
nativeAdView.advertiserView.hidden = nativeAd.advertiser ? NO : YES;
// In order for the SDK to process touch events properly, user interaction
// should be disabled.
nativeAdView.callToActionView.userInteractionEnabled = NO;
// Associate the native ad view with the native ad object. This is
// required to make the ad clickable.
nativeAdView.nativeAd = nativeAd;
}
GitHub 上的完整示例
如需查看在 Swift、SwiftUI 和 Objective-C 中集成原生广告的完整示例，请点击相应的 GitHub 链接。
Swift 自定义呈现广告示例 SwiftUI 原生广告示例 Objective-C 自定义呈现广告示例
GADMediaView
图片和视频素材资源通过 GADMediaView 向用户展示。这是可在 xib 文件中定义或动态构建的 UIView。像所有其他素材资源视图一样，应该将其放在 GADNativeAdView 的视图层次结构中。
与所有素材资源视图一样，媒体视图也需要填充内容，可以使用 GADMediaView 中的 mediaContent 属性对此进行设置。GADNativeAd 的 mediaContent 属性包含可传递到 GADMediaView 的媒体内容。
以下是自定义呈现广告的代码段示例 (Swift | Objective-C)，该示例展示了如何使用 GADNativeAd 的 GADMediaContent，以原生广告素材资源填充 GADMediaView：
Swift
nativeAdView.mediaView?.mediaContent = nativeAd.mediaContent
Objective-C
nativeAdView.mediaView.mediaContent = nativeAd.mediaContent;
确保在原生广告视图的 Interface Builder 文件中，您已将视图自定义类设置为 GADMediaView，并已将其连接到 mediaView 输出口。
更改图片内容模式
GADMediaView 类在显示图片时遵循 UIView
contentMode 属性。如果您想在 GADMediaView 中更改图片的缩放方式，请在 GADMediaView 的 contentMode 属性中设置相应的 UIViewContentMode 来达到此目的。
例如，要在图片显示时填充 GADMediaView（广告中不包含视频），请使用以下代码：
Swift
nativeAdView.mediaView?.contentMode = .aspectFill
Objective-C
nativeAdView.mediaView.contentMode = UIViewContentModeAspectFill;
GADMediaContent
GADMediaContent 类包含与原生广告的媒体内容相关的数据，媒体内容则通过 GADMediaView 类展示。在 GADMediaView
mediaContent 属性中设置时：
如果广告有视频素材资源可用，则系统会对其进行缓冲，并开始在
GADMediaView内播放。您可以通过检查hasVideoContent来判断是否有视频素材资源可用。如果广告不包含视频素材资源，则会改为下载
mainImage素材资源，并将其放置在GADMediaView内。
后续步骤
详细了解用户隐私权。