本指南介绍了一些最佳实践，可帮助您了解如何编写应用代码，以便在 iPhone X 上正确呈现广告。
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、传感器外壳和主屏幕指示器遮挡。本页将举例说明如何通过添加限制来将横幅广告放置在安全区域的顶部或底部。
分镜脚本/界面构建器
如果您的应用使用 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。
打开 Interface Builder 文件，然后点击视图控制器场景。您会在右侧看到 Interface Builder 文档选项。选中使用安全区域布局指南，并确保您的构建针对的是 iOS 9.0 及更高版本（最低版本）。
我们建议您使用宽度和高度限制将横幅广告限制到所需的尺寸。
现在，您可以将 GADBannerView 的 Top 属性限制在安全区域的顶部，从而将横幅广告与安全区域的顶部对齐：
同样，您可以将 GADBannerView 的 Bottom 属性限制在安全区域的底部，从而使横幅广告与安全区域的底部对齐：
现在，您的约束条件应类似于以下屏幕截图（大小/位置可能会有所不同）：
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，请将横幅广告的左侧/右侧边缘约束为安全区域的左侧/右侧边缘，而不是父视图的左侧/右侧边缘。
如果您启用了使用安全区域布局指南，那么在为视图添加约束条件时，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制作横幅广告，您可以通过代码定义限制条件并设置横幅广告的位置。以下示例展示了如何将横幅广告限制为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
通过修改所使用的属性和锚点，上述技术可以轻松用于约束到安全区域的顶部。
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），我们建议您使用约束条件，使横幅广告的边缘与安全区域的左右边缘对齐。
在 Interface Builder 中，选中上述使用安全区域布局指南选项，即可重新支持 iOS 9。
在代码中，您应该根据安全区域布局指南（如果有）设定边缘约束条件。以下代码段可向视图添加横幅广告视图，并将其限制为全宽视图底部：
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，您需要向 GADUnifiedNativeAdView（或广告的包含视图）添加约束条件，而不是为 GADBannerView 添加约束条件。对于原生视图，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 版开始，Google 移动广告 SDK 完全支持在 iPhone X 上使用插页式广告和激励广告格式。