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iPhone X 广告呈现

本指南介绍了各种最佳应用编码实践，方便您在 iPhone X 上正确地呈现广告。

前提条件

导入 Google 移动广告 SDK 7.26.0 或更高版本（可以只导入其自身，也可以将其作为 Firebase 的一部分加以导入）。

横幅广告

横幅广告必须放置在“安全区域”内，以免被圆角、传感器外壳和底部横条遮挡。此页面向您提供了各种示例，说明如何通过添加限制来将横幅广告固定到安全区域的顶部或底部。

Storyboard/Interface Builder

如果您的应用使用的是 Interface Builder，请先确保已启用安全区域布局指南。为此，您需要运行 Xcode 9 及更高版本，并以 iOS 9 及更高版本为目标平台。

打开 Interface Builder 文件，然后点击视图控制器场景。此时您将在右侧看到 Interface Builder 文档选项。选中使用安全区域布局指南，并确保您的构建目标是 iOS 9.0 及更高版本（最低版本）。

我们建议您输入宽度和高度限制值，从而将横幅广告调整为所需的尺寸。

现在，您可以将 GADBannerView 的顶部属性限制设为安全区域的顶部，从而使横幅广告与安全区域的顶部对齐：

同样，您可以将 GADBannerView 的底部属性限制设为安全区域的底部，从而使横幅广告与安全区域的底部对齐：

现在，您设置的限制值应与以下屏幕截图类似（尺寸/定位可能不尽相同）：

ViewController

以下是一个简单的视图控制器代码段，执行在上述 Storyboard 中配置的 GADBannerView 中展示横幅广告所需的最低要求：

Swift

class ViewController: UIViewController {

  /// The banner view.
  @IBOutlet var bannerView: GADBannerView!

  override func viewDidLoad() {
    super.viewDidLoad()
    // Replace this ad unit ID with your own ad unit ID.
    bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
    bannerView.rootViewController = self
    bannerView.load(GADRequest())
  }

}

Objective-C

@interface ViewController()

@property(nonatomic, strong) IBOutlet GADBannerView *bannerView;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  // Replace this ad unit ID with your own ad unit ID.
  self.bannerView.adUnitID = @"ca-app-pub-3940256099942544/2934735716";
  self.bannerView.rootViewController = self;
  GADRequest *request = [GADRequest request];
  [self.bannerView loadRequest:request];
}

将横幅广告与安全区域边缘对齐

如果您希望让横幅广告左对齐或右对齐，请输入横幅广告左/右侧的限制值，使其与安全区域的左/右侧对齐，而不是父视图的左/右侧。

如果您已启用使用安全区域布局指南，那么在给视图设置限制值时，Interface Builder 将默认使用安全区域边缘。

程序化

如果您的应用以程序化方式创建横幅广告，则可以通过代码来定义限制条件并设置横幅广告的位置。此示例展示了如何设置横幅广告限制值，使其在安全区域底部水平居中：

Swift

class ViewController: UIViewController {

  var bannerView: GADBannerView!

  override func viewDidLoad() {
    super.viewDidLoad()

    // Instantiate the banner view with your desired banner size.
    bannerView = GADBannerView(adSize: GADAdSizeBanner)
    addBannerViewToView(bannerView)
    bannerView.rootViewController = self
    // Set the ad unit ID to your own ad unit ID here.
    bannerView.adUnitID = "ca-app-pub-3940256099942544/2934735716"
    bannerView.load(GADRequest())
  }

  func addBannerViewToView(_ bannerView: UIView) {
    bannerView.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(bannerView)
    if #available(iOS 11.0, *) {
      positionBannerAtBottomOfSafeArea(bannerView)
    }
    else {
      positionBannerAtBottomOfView(bannerView)
    }
  }

  @available (iOS 11, *)
  func positionBannerAtBottomOfSafeArea(_ bannerView: UIView) {
    // Position the banner. Stick it to the bottom of the Safe Area.
    // Centered horizontally.
    let guide: UILayoutGuide = view.safeAreaLayoutGuide

    NSLayoutConstraint.activate(
      [bannerView.centerXAnchor.constraint(equalTo: guide.centerXAnchor),
       bannerView.bottomAnchor.constraint(equalTo: guide.bottomAnchor)]
    )
  }

  func positionBannerAtBottomOfView(_ bannerView: UIView) {
    // Center the banner horizontally.
    view.addConstraint(NSLayoutConstraint(item: bannerView,
                                          attribute: .centerX,
                                          relatedBy: .equal,
                                          toItem: view,
                                          attribute: .centerX,
                                          multiplier: 1,
                                          constant: 0))
    // Lock the banner to the top of the bottom layout guide.
    view.addConstraint(NSLayoutConstraint(item: bannerView,
                                          attribute: .bottom,
                                          relatedBy: .equal,
                                          toItem: self.bottomLayoutGuide,
                                          attribute: .top,
                                          multiplier: 1,
                                          constant: 0))
  }

}

Objective-C

@interface ViewController()

@property(nonatomic, strong) GADBannerView *bannerView;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  // Instantiate the banner view with your desired banner size.
  self.bannerView = [[GADBannerView alloc] initWithAdSize:GADAdSizeBanner];
  [self addBannerViewToView:self.bannerView];

  // Replace this ad unit ID with your own ad unit ID.
  self.bannerView.adUnitID = @"ca-app-pub-3940256099942544/2934735716";
  self.bannerView.rootViewController = self;
  GADRequest *request = [GADRequest request];
  [self.bannerView loadRequest:request];
}

#pragma mark - view positioning

-(void)addBannerViewToView:(UIView *_Nonnull)bannerView {
  self.bannerView.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:self.bannerView];
  if (@available(ios 11.0, *)) {
    [self positionBannerViewAtBottomOfSafeArea:bannerView];
  } else {
    [self positionBannerViewAtBottomOfView:bannerView];
  }
}

- (void)positionBannerViewAtBottomOfSafeArea:(UIView *_Nonnull)bannerView NS_AVAILABLE_IOS(11.0) {
  // Position the banner. Stick it to the bottom of the Safe Area.
  // Centered horizontally.
  UILayoutGuide *guide = self.view.safeAreaLayoutGuide;
  [NSLayoutConstraint activateConstraints:@[
    [bannerView.centerXAnchor constraintEqualToAnchor:guide.centerXAnchor],
    [bannerView.bottomAnchor constraintEqualToAnchor:guide.bottomAnchor]
  ]];
}

- (void)positionBannerViewAtBottomOfView:(UIView *_Nonnull)bannerView {
  [self.view addConstraint:[NSLayoutConstraint constraintWithItem:bannerView
                                                        attribute:NSLayoutAttributeCenterX
                                                        relatedBy:NSLayoutRelationEqual
                                                           toItem:self.view
                                                        attribute:NSLayoutAttributeCenterX
                                                       multiplier:1
                                                         constant:0]];
  [self.view addConstraint:[NSLayoutConstraint constraintWithItem:bannerView
                                                        attribute:NSLayoutAttributeBottom
                                                        relatedBy:NSLayoutRelationEqual
                                                           toItem:self.bottomLayoutGuide
                                                        attribute:NSLayoutAttributeTop
                                                       multiplier:1
                                                         constant:0]];
}

@end

通过修改所用的属性和锚点，您可以轻松地使用上述方法将限制值设置为安全区域的顶部。

智能横幅广告

如果您使用的是智能横幅广告，尤其是横向横幅广告，我们建议您使用限制值，使横幅广告的边缘与安全区域的左侧和右侧对齐。

在 Interface Builder 中，选中上述使用安全区域布局指南选项，即可针对 iOS 9 及更高版本实现这一点。

在代码中，您应该使边缘约束条件与安全区域布局指南相对应（如果有）。以下代码段可向视图中添加一个横幅广告视图，并将限制值设置为视图底部（全宽）：

Swift

func addBannerViewToView(_ bannerView: GADBannerView) {
  bannerView.translatesAutoresizingMaskIntoConstraints = false
  view.addSubview(bannerView)
  if #available(iOS 11.0, *) {
    // In iOS 11, we need to constrain the view to the safe area.
    positionBannerViewFullWidthAtBottomOfSafeArea(bannerView)
  }
  else {
    // In lower iOS versions, safe area is not available so we use
    // bottom layout guide and view edges.
    positionBannerViewFullWidthAtBottomOfView(bannerView)
  }
}

// MARK: - view positioning
@available (iOS 11, *)
func positionBannerViewFullWidthAtBottomOfSafeArea(_ bannerView: UIView) {
  // Position the banner. Stick it to the bottom of the Safe Area.
  // Make it constrained to the edges of the safe area.
  let guide = view.safeAreaLayoutGuide
  NSLayoutConstraint.activate([
    guide.leftAnchor.constraint(equalTo: bannerView.leftAnchor),
    guide.rightAnchor.constraint(equalTo: bannerView.rightAnchor),
    guide.bottomAnchor.constraint(equalTo: bannerView.bottomAnchor)
  ])
}

func positionBannerViewFullWidthAtBottomOfView(_ bannerView: UIView) {
  view.addConstraint(NSLayoutConstraint(item: bannerView,
                                        attribute: .leading,
                                        relatedBy: .equal,
                                        toItem: view,
                                        attribute: .leading,
                                        multiplier: 1,
                                        constant: 0))
  view.addConstraint(NSLayoutConstraint(item: bannerView,
                                        attribute: .trailing,
                                        relatedBy: .equal,
                                        toItem: view,
                                        attribute: .trailing,
                                        multiplier: 1,
                                        constant: 0))
  view.addConstraint(NSLayoutConstraint(item: bannerView,
                                        attribute: .bottom,
                                        relatedBy: .equal,
                                        toItem: bottomLayoutGuide,
                                        attribute: .top,
                                        multiplier: 1,
                                        constant: 0))
}

Objective-C

- (void)addBannerViewToView:(UIView *)bannerView {
  bannerView.translatesAutoresizingMaskIntoConstraints = NO;
  [self.view addSubview:bannerView];
  if (@available(ios 11.0, *)) {
    // In iOS 11, we need to constrain the view to the safe area.
    [self positionBannerViewFullWidthAtBottomOfSafeArea:bannerView];
  } else {
    // In lower iOS versions, safe area is not available so we use
    // bottom layout guide and view edges.
    [self positionBannerViewFullWidthAtBottomOfView:bannerView];
  }
}

#pragma mark - view positioning

- (void)positionBannerViewFullWidthAtBottomOfSafeArea:(UIView *_Nonnull)bannerView NS_AVAILABLE_IOS(11.0) {
  // Position the banner. Stick it to the bottom of the Safe Area.
  // Make it constrained to the edges of the safe area.
  UILayoutGuide *guide = self.view.safeAreaLayoutGuide;

  [NSLayoutConstraint activateConstraints:@[
    [guide.leftAnchor constraintEqualToAnchor:bannerView.leftAnchor],
    [guide.rightAnchor constraintEqualToAnchor:bannerView.rightAnchor],
    [guide.bottomAnchor constraintEqualToAnchor:bannerView.bottomAnchor]
  ]];
}

- (void)positionBannerViewFullWidthAtBottomOfView:(UIView *_Nonnull)bannerView {
  [self.view addConstraint:[NSLayoutConstraint constraintWithItem:bannerView
                                                        attribute:NSLayoutAttributeLeading
                                                        relatedBy:NSLayoutRelationEqual
                                                           toItem:self.view
                                                        attribute:NSLayoutAttributeLeading
                                                       multiplier:1
                                                         constant:0]];
  [self.view addConstraint:[NSLayoutConstraint constraintWithItem:bannerView
                                                        attribute:NSLayoutAttributeTrailing
                                                        relatedBy:NSLayoutRelationEqual
                                                           toItem:self.view
                                                        attribute:NSLayoutAttributeTrailing
                                                       multiplier:1
                                                         constant:0]];
  [self.view addConstraint:[NSLayoutConstraint constraintWithItem:bannerView
                                                        attribute:NSLayoutAttributeBottom
                                                        relatedBy:NSLayoutRelationEqual
                                                           toItem:self.bottomLayoutGuide
                                                        attribute:NSLayoutAttributeTop
                                                       multiplier:1
                                                         constant:0]];
}

原生广告

如果您的应用将原生广告固定到屏幕顶部或底部，那么适用于横幅广告的原则同样适用于原生广告。主要区别在于：为了遵循安全区域布局指南，您需要为 GADUnifiedNativeAdView（或广告的父级视图）设置限制值，而不是为 GADBannerView 设置限制值。对于原生广告视图，我们建议您提供更明确的尺寸限制值。

插页式广告和激励广告

从 7.26.0 版本开始，Google 移动广告 SDK 完全支持在 iPhone X 上呈现插页式广告和激励广告格式。