Unity游戏每5局展示插屏广告失效问题求助

我写了一套Unity游戏脚本，希望玩家每失败5次后展示插屏广告，但测试时广告无法正常触发——只有把gamesToShowAd设为1时广告才会显示。试了多种实现方式都没用，附上GameManager和AdsManager的代码，求帮忙排查问题。

GameManager 脚本 #

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour
{
    public GameObject gameOverCanvas;
    public AdsManager ads;
    int gameCount = 0;
    int gamesToShowAd = 5;

    private void Start()
    {
        Time.timeScale = 1;
        ads.ShowBanner();
        gameCount = 0;
    }

    public void GameOver()
    {
        gameOverCanvas.SetActive(true);
        Time.timeScale = 0;

        gameCount++; //increment game count

        if (gameCount >= gamesToShowAd) // check if player played enough games to show ad
        {
            ads.PlayAd();
            gameCount = 0; // reset counter
        }
    }

    public void Replay()
    {
        SceneManager.LoadScene(0);
    }
}

AdsManager 脚本 #

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Advertisements;

public class AdsManager : MonoBehaviour, IUnityAdsListener
{
#if UNITY_IOS
    string gameId = "#######";
#else
    string gameId = "#######";
#endif

    Action onRewardedAdSuccess;

    // Start is called before the first frame update
    void Start()
    {
        Advertisement.Initialize(gameId);
        Advertisement.AddListener(this);
        ShowBanner();
    }

    public void PlayAd()
    {
        if(Advertisement.IsReady("Interstitial_Android"))
            Advertisement.Show("Interstitial_Android");
    }

    public void PlayRewardedAd(Action onSuccess)
    {
        onRewardedAdSuccess = onSuccess;
        if(Advertisement.IsReady("Rewarded_Android"))
        {
        Advertisement.Show("Rewarded_Android");
        }
        else
        {
            Debug.Log("Rewarded ad is not ready!");
        }
    }

    public void ShowBanner()
    {
        if (Advertisement.IsReady("Banner_Android"))
        {
            Advertisement.Banner.SetPosition(BannerPosition.BOTTOM_CENTER);
            Advertisement.Banner.Show("Banner_Android");
        }
        else
        {
            StartCoroutine(RepeatShowBanner());
        }
    }

    public void HideBanner()
    {
        Advertisement.Banner.Hide();
    }

    IEnumerator RepeatShowBanner()
    {
        yield return new WaitForSeconds(1);
        ShowBanner();
    }

    public void OnUnityAdsReady(string placementId)
    {
        Debug.Log("ADS ARE READY!");
    }

    public void OnUnityAdsDidError(string message)
    {
        Debug.Log("ERROR: " + message);
    }

    public void OnUnityAdsDidStart(string placementId)
    {
        Debug.Log("VIDEO STARTED!");
    }

    public void OnUnityAdsDidFinish(string placementId, ShowResult showResult)
    {
        if (placementId == "Rewarded_Android" && showResult == ShowResult.Finished)
        {
            onRewardedAdSuccess.Invoke();
        }
    }
}

问题排查与修复方案 #

1. 核心问题：场景重载导致计数器重置

每次调用Replay()加载场景时，原GameManager实例会被销毁，新实例的gameCount会在Start()中被重置为0，导致永远无法累积到5次失败。

修复方式二选一：

• 方案A：单例模式保留GameManager
  修改GameManager的Awake和Start方法，让实例跨场景保留：

  public class GameManager : MonoBehaviour
  {
      public static GameManager Instance;
      public GameObject gameOverCanvas;
      public AdsManager ads;
      int gameCount = 0;
      int gamesToShowAd = 5;
  
      private void Awake()
      {
          if (Instance == null)
          {
              Instance = this;
              DontDestroyOnLoad(gameObject);
          }
          else
          {
              Destroy(gameObject);
          }
      }
  
      private void Start()
      {
          Time.timeScale = 1;
          ads.ShowBanner();
          // 移除gameCount = 0，避免场景重载时重置计数器
      }
  
      // 其他方法保持不变
  }
  

• 方案B：用PlayerPrefs持久化计数器
  适合需要跨游戏会话保存失败次数的场景：

  private void Start()
  {
      Time.timeScale = 1;
      ads.ShowBanner();
      gameCount = PlayerPrefs.GetInt("GameFailCount", 0); // 从本地读取计数
  }
  
  public void GameOver()
  {
      gameOverCanvas.SetActive(true);
      Time.timeScale = 0;
  
      gameCount++;
      PlayerPrefs.SetInt("GameFailCount", gameCount);
      PlayerPrefs.Save();
  
      if (gameCount >= gamesToShowAd)
      {
          ads.PlayAd();
          gameCount = 0;
          PlayerPrefs.SetInt("GameFailCount", 0);
          PlayerPrefs.Save();
      }
  }
  

2. 广告位平台适配问题

当前PlayAd()只判断了Android的插屏广告位，若在iOS平台测试，Advertisement.IsReady()会返回false，导致广告不显示。

修复：

public void PlayAd()
{
    string interstitialId;
#if UNITY_IOS
    interstitialId = "Interstitial_iOS"; // 替换为你的iOS插屏广告位ID
#else
    interstitialId = "Interstitial_Android";
#endif
    if(Advertisement.IsReady(interstitialId))
        Advertisement.Show(interstitialId);
    else
    {
        Debug.Log($"插屏广告 {interstitialId} 未准备好");
    }
}

3. 增加调试日志确认广告状态

修改OnUnityAdsReady方法，打印具体广告位ID，确认插屏广告是否真的准备完成：

public void OnUnityAdsReady(string placementId)
{
    Debug.Log($"广告位 {placementId} 已准备好!");
}

内容的提问来源于stack exchange，提问作者Niks Rodžers