本頁面由 Cloud Translation API 翻譯而成。

獎勵廣告自訂事件

必要條件

索取獎勵廣告

當瀑布式中介鏈中的自訂事件委刊項到達時，系統會根據您在建立自訂事件時提供的類別名稱，呼叫 loadRewarded:adConfiguration:completionHandler: 方法。在本例中，該方法位於 SampleCustomEvent 中，然後會在 SampleCustomEventRewarded 中呼叫 loadRewarded:adConfiguration:completionHandler: 方法。

如要要求獎勵廣告，請建立或修改實作 GADMediationAdapter 和 loadRewarded:adConfiguration:completionHandler: 的類別。如果已存在可擴充 GADMediationAdapter 的類別，請在該類別中實作 loadRewarded:adConfiguration:completionHandler:。此外，請建立新類別來實作 GADMediationRewardedAd。

在自訂事件範例中，SampleCustomEvent 會實作 GADMediationAdapter 介面，然後將委派作業交給 SampleCustomEventRewarded。

Swift

import GoogleMobileAds

class SampleCustomEvent: NSObject, GADMediationAdapter {

  fileprivate var rewardedAd: SampleCustomEventRewarded?
  ...

  func loadRewarded(
    for adConfiguration: GADMediationRewardedAdConfiguration,
    completionHandler: @escaping GADMediationRewardedLoadCompletionHandler
  ) {
    self.rewardedAd = SampleCustomEventRewarded()
    self.rewardedAd?.loadRewarded(
      for: adConfiguration, completionHandler: completionHandler)
  }
}

Objective-C

#import "SampleCustomEvent.h"

@implementation SampleCustomEvent
...

SampleCustomEventRewarded *sampleRewarded;

- (void)loadRewardedForAdConfiguration:
            (GADMediationRewardedAdConfiguration *)adConfiguration
                     completionHandler:
                         (GADMediationRewardedLoadCompletionHandler)
                             completionHandler {
  sampleRewarded = [[SampleCustomEventRewarded alloc] init];
  [sampleRewarded loadRewardedForAdConfiguration:adConfiguration
                               completionHandler:completionHandler];
}

SampleCustomEventRewarded 負責執行以下工作：

載入獎勵廣告。
實作 GADMediationRewardedAd 通訊協定。
接收並回報廣告事件回呼至 Google Mobile Ads SDK。

廣告設定中會納入 AdMob UI 中定義的選用參數。您可以透過 adConfiguration.credentials.settings[@"parameter"] 存取此參數。這個參數通常是廣告聯播網 SDK 在例項化廣告物件時所需的廣告單元 ID。

Swift

class SampleCustomEventRewarded: NSObject, GADMediationRewardedAd {
  /// The Sample Ad Network rewarded ad.
  var nativeAd: SampleRewarded?

  /// The ad event delegate to forward ad rendering events to the Google Mobile Ads SDK.
  var delegate: GADMediationRewardedAdEventDelegate?

  /// Completion handler called after ad load.
  var completionHandler: GADMediationRewardedLoadCompletionHandler?

  func loadRewarded(
    for adConfiguration: GADMediationRewardedAdConfiguration,
    completionHandler: @escaping GADMediationRewardedLoadCompletionHandler
  ) {
    rewarded = SampleRewarded.init(
      adUnitID: adConfiguration.credentials.settings["parameter"] as? String)
    rewarded?.delegate = self
    let adRequest = SampleAdRequest()
    adRequest.testMode = adConfiguration.isTestRequest
    self.completionHandler = completionHandler
    rewarded?.fetchAd(adRequest)
  }
}

Objective-C

#import "SampleCustomEventRewarded.h"

@interface SampleCustomEventRewarded () <SampleRewardedAdDelegate,
                                         GADMediationRewardedAd> {
  /// The sample rewarded ad.
  SampleRewarded *_rewardedAd;

  /// The completion handler to call when the ad loading succeeds or fails.
  GADMediationRewardedLoadCompletionHandler _loadCompletionHandler;

  /// The ad event delegate to forward ad rendering events to the Google Mobile Ads SDK.
  id <GADMediationRewardedAdEventDelegate> _adEventDelegate;
}
@end

- (void)loadRewardedAdForAdConfiguration:(GADMediationRewardedAdConfiguration *)adConfiguration
                       completionHandler:
                           (GADMediationRewardedLoadCompletionHandler)completionHandler {
  __block atomic_flag completionHandlerCalled = ATOMIC_FLAG_INIT;
  __block GADMediationRewardedLoadCompletionHandler originalCompletionHandler =
      [completionHandler copy];

  _loadCompletionHandler = ^id<GADMediationRewardedAdEventDelegate>(
      _Nullable id<GADMediationRewardedAd> ad, NSError *_Nullable error) {
    // Only allow completion handler to be called once.
    if (atomic_flag_test_and_set(&completionHandlerCalled)) {
      return nil;
    }

    id<GADMediationRewardedAdEventDelegate> delegate = nil;
    if (originalCompletionHandler) {
      // Call original handler and hold on to its return value.
      delegate = originalCompletionHandler(ad, error);
    }

    // Release reference to handler. Objects retained by the handler will also be released.
    originalCompletionHandler = nil;

    return delegate;
  };

  NSString *adUnit = adConfiguration.credentials.settings[@"parameter"];
  _rewardedAd = [[SampleRewardedAd alloc] initWithAdUnitID:adUnit];
  _rewardedAd.delegate = self;
  SampleAdRequest *adRequest = [[SampleAdRequest alloc] init];
  adRequest.testMode = adConfiguration.isTestRequest;
  [_rewardedAd fetchAd:adRequest];
}

無論廣告是否成功擷取或發生錯誤，您都會呼叫 GADMediationRewardedLoadCompletionHandler。如果成功，請傳遞實作 GADMediationRewardedAd 的類別，並使用錯誤參數的 nil 值；如果失敗，請傳遞遇到的錯誤。

一般來說，這些方法會在轉接程式實作的第三方 SDK 回呼中實作。在本例中，Sample SDK 具有含有相關回呼的 SampleRewardedAdDelegate：

Swift

func rewardedDidLoad(_ interstitial: SampleRewarded) {
  if let handler = completionHandler {
    delegate = handler(self, nil)
  }
}

func rewarded(
  rewarded: SampleRewarded, didFailToLoadAdWith errorCode: SampleErrorCode
) {
  let error =
    SampleCustomEventUtils.SampleCustomEventErrorWithCodeAndDescription(
      code: SampleCustomEventErrorCode
        .SampleCustomEventErrorAdLoadFailureCallback,
      description:
        "Sample SDK returned an ad load failure callback with error code: \(errorCode)"
    )
  if let handler = completionHandler {
    delegate = handler(nil, error)
  }
}

Objective-C

- (void)rewardedDidLoad:(SampleRewarded *)rewarded {
  _adEventDelegate = _loadCompletionHandler(self, nil);
}

- (void)rewarded:(SampleInterstitial *)rewarded
    didFailToLoadAdWithErrorCode:(SampleErrorCode)errorCode {
  NSError *error = SampleCustomEventErrorWithCodeAndDescription(
      SampleCustomEventErrorAdLoadFailureCallback,
      [NSString stringWithFormat:@"Sample SDK returned an ad load failure "
                                 @"callback with error code: %@",
                                 errorCode]);
  _adEventDelegate = _loadCompletionHandler(nil, error);
}

GADMediationrewardedAd 需要實作 present(viewController:) 方法才能顯示廣告：

Swift

func present(from viewController: UIViewController) {
  if let rewarded = rewarded, rewarded.isRewardedLoaded {
    rewarded.show()
  }
}

Objective-C

- (void)presentFromViewController:(UIViewController *)viewController {
  if ([_rewardedAd isRewardedLoaded]) {
    [_rewardedAd show];
  } else {
    NSError *error = SampleCustomEventErrorWithCodeAndDescription(
        SampleCustomEventErrorAdNotLoaded,
        [NSString stringWithFormat:
                      @"The rewarded ad failed to present because the ad was not loaded."]);
    [_adEventDelegate didFailToPresentWithError:error]
  }
}

將中介服務事件轉送至 Google Mobile Ads SDK

您只要使用已載入的廣告呼叫 GADMediationRewardedLoadCompletionHandler，轉接器就能使用傳回的 GADMediationRewardedAdEventDelegate 委派物件，將第三方 SDK 的呈現事件轉送至 Google Mobile Ads SDK。SampleCustomEventRewarded 類別會實作 SampleRewardedAdDelegate 通訊協定，將來自範例廣告聯播網的回呼轉送至 Google Mobile Ads SDK。

請務必盡可能轉寄這些回呼，讓應用程式從 Google Mobile Ads SDK 接收這些對等事件。以下是使用回呼的範例：

Swift

func rewardedAdDidPresent(_ rewarded: SampleRewardedAd) {
  delegate?.willPresentFullScreenVideo()
  delegate?.didStartVideo()
}

func rewardedAdUserDidEarnReward(_ rewarded: SampleRewardedAd) {
  GADAdReward aReward = GADAdReward("", rewarded)
  delegate.didRewardUser()
}

Objective-C

- (void)rewardedAdDidPresent:(SampleRewardedAd *)rewardedAd {
  [_adEventDelegate willPresentFullScreenView];
  [_adEventDelegate didStartVideo];
}

- (void)rewardedAd:(nonnull SampleRewardedAd *)rewardedAd
    userDidEarnReward:(NSUInteger)reward {
  GADAdReward *aReward = [[GADAdReward alloc]
      initWithRewardType:@""
            rewardAmount:[NSDecimalNumber numberWithUnsignedInt:reward]];
  [_adEventDelegate didRewardUserWithReward];
}

這就完成了獎勵廣告的自訂事件實作。您可以在 GitHub 上取得完整範例。您可以將其與已支援的廣告聯播網搭配使用，也可以修改該廣告活動，以便顯示自訂事件獎勵廣告。