iOS Objective-C中Google插屏广告全屏展示失败问题求助

问题分析与修复步骤 #

1. 重复调用广告展示方法 #

你的代码在viewWillAppear里连续执行了两次[self.interstitial presentFromRootViewController:self];，这是触发展示失败的核心原因。GADInterstitialAd实例仅能被展示一次，连续调用会直接导致广告展示失败。

修复代码：
删除重复的展示调用，只保留一次：

if (self.interstitial) {
    NSLog(@"Show InterstitialAd %@", self.interstitial);
    [self.interstitial presentFromRootViewController:self];
} else {
    NSLog(@"Ad wasn't ready event");
}

2. 处理广告实例的一次性限制 #

GADInterstitialAd是一次性资源，广告展示完成后就会失效，无法再次使用。你需要在广告关闭后及时清空旧实例并加载新广告，避免下次展示时调用已失效的实例。

修复代码：
在广告关闭的代理方法中重新加载广告：

- (void)adDidDismissFullScreenContent:(nonnull id<GADFullScreenPresentingAd>)ad {
    NSLog(@"Ad did dismiss full screen content.");
    self.interstitial = nil; // 清空失效实例
    [self loadInterstitial]; // 加载新的插屏广告
}

3. 避免重复触发展示逻辑 #

viewWillAppear会在每次页面显示时被调用，结合dispatch_after可能导致多个延迟任务同时触发，重复尝试展示广告。建议添加标记位控制展示逻辑的执行时机。

修复代码：
先在类扩展或头文件中声明标记位：

@property (nonatomic, assign) BOOL isAdPresenting;

然后修改viewWillAppear及代理方法：

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    NSLog(@"self.inter eve reload cl %@", self.interstitial);
    DebugAssert(index != NSNotFound);
    double delayInSeconds = 5.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    
    if (!didPurchaseAds && !self.isAdPresenting) {
        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
            NSLog(@"Interstitial ad loaded %ld", (long)index);
            if ((index % 2 == 0)) {
                NSLog(@"Interstitial ad loaded for even num %ld", (long)index);
                if (self.interstitial && !self.isAdPresenting) {
                    self.isAdPresenting = YES;
                    NSLog(@"Show InterstitialAd %@", self.interstitial);
                    [self.interstitial presentFromRootViewController:self];
                } else {
                    NSLog(@"Ad wasn't ready event");
                }
            }
        });
    }
}

- (void)adWillPresentFullScreenContent:(nonnull id<GADFullScreenPresentingAd>)ad {
    NSLog(@"Ad will present full screen content.");
    self.isAdPresenting = YES;
}

- (void)adDidDismissFullScreenContent:(nonnull id<GADFullScreenPresentingAd>)ad {
    NSLog(@"Ad did dismiss full screen content.");
    self.isAdPresenting = NO;
    self.interstitial = nil;
    [self loadInterstitial];
}

- (void)ad:(nonnull id<GADFullScreenPresentingAd>)ad didFailToPresentFullScreenContentWithError:(nonnull NSError *)error {
    NSLog(@"Ad did fail to present full screen content.");
    self.isAdPresenting = NO;
}

4. 打印完整错误信息 #

当前错误代理方法仅输出通用提示，建议补充打印具体错误详情，方便排查其他潜在问题：

- (void)ad:(nonnull id<GADFullScreenPresentingAd>)ad didFailToPresentFullScreenContentWithError:(nonnull NSError *)error {
    NSLog(@"Ad did fail to present full screen content. Error: %@", error.localizedDescription);
    NSLog(@"Error code: %ld, domain: %@", (long)error.code, error.domain);
}

内容的提问来源于stack exchange，提问作者sejn