* Pass the callbacks in the constructor when creating iOS plugin classes.

* Fix typos and add null checks.

PiperOrigin-RevId: 782248664

Author: Mobile Ads Developer Relations

source/plugin/Assets/GoogleMobileAds/Platforms/iOS/Externs.cs

@@ -389,50 +389,45 @@ internal static extern void GADUSetRewardedAdPreloaderCallbacks(
 
         [DllImport("__Internal")]
         internal static extern IntPtr GADUCreateInterstitialAdPreloader(
-            IntPtr interstitialAdPreloaderClient);
+            IntPtr interstitialAdPreloaderClient,
+            InterstitialAdPreloaderClient.GADUAdAvailableForPreloadIdCallback adPreloadedCallback,
+            InterstitialAdPreloaderClient.GADUAdFailedToPreloadForPreloadIdCallback
+                adFailedToPreloadCallback,
+            InterstitialAdPreloaderClient.GADUAdsExhaustedForPreloadIdCallback
+                adsExhaustedCallback);
 
         [DllImport("__Internal")]
         internal static extern bool GADUInterstitialAdPreloaderPreload(
-            IntPtr interstitialAdPreloaderClient,
-            string preloadId, IntPtr preloadConfiguration);
+            IntPtr interstitialAdPreloader, string preloadId, IntPtr preloadConfiguration);
 
         [DllImport("__Internal")]
         internal static extern bool GADUInterstitialAdPreloaderIsAdAvailable(
-            IntPtr interstitialAdPreloaderClient, string preloadId);
+            IntPtr interstitialAdPreloader, string preloadId);
 
         [DllImport("__Internal")]
         internal static extern IntPtr GADUInterstitialAdPreloaderGetPreloadedAd(
-            IntPtr interstitialAdPreloaderClient, string preloadId, IntPtr appOpenAdClientPtr);
+            IntPtr interstitialAdPreloader, string preloadId, IntPtr appOpenAdClientPtr);
 
         [DllImport("__Internal")]
         internal static extern int GADUInterstitialAdPreloaderGetNumAdsAvailable(
-            IntPtr interstitialAdPreloaderClient, string preloadId);
+            IntPtr interstitialAdPreloader, string preloadId);
 
         [DllImport("__Internal")]
         internal static extern IntPtr GADUInterstitialAdPreloaderGetConfiguration(
-            IntPtr interstitialAdPreloaderClient, string preloadId);
+            IntPtr interstitialAdPreloader, string preloadId);
 
         [DllImport("__Internal")]
         internal static extern IntPtr GADUInterstitialAdPreloaderGetConfigurations(
-            IntPtr interstitialAdPreloaderClient);
+            IntPtr interstitialAdPreloader);
 
         [DllImport("__Internal")]
         internal static extern bool GADUInterstitialAdPreloaderDestroy(
-            IntPtr interstitialAdPreloaderClient,
+            IntPtr interstitialAdPreloader,
             string preloadId);
 
         [DllImport("__Internal")]
         internal static extern void GADUInterstitialAdPreloaderDestroyAll(
-            IntPtr interstitialAdPreloaderClient);
-
-        [DllImport("__Internal")]
-        internal static extern void GADUSetInterstitialAdPreloaderCallbacks(
-            IntPtr interstitialAdPreloader,
-            InterstitialAdPreloaderClient.GADUAdAvailableForPreloadIdCallback adPreloadedCallback,
-            InterstitialAdPreloaderClient.GADUAdFailedToPreloadForPreloadIdCallback
-                adFailedToPreloadCallback,
-            InterstitialAdPreloaderClient.GADUAdsExhaustedForPreloadIdCallback
-                adsExhaustedCallback);
+            IntPtr interstitialAdPreloader);
 
         #endregion
 

source/plugin/Assets/GoogleMobileAds/Platforms/iOS/InterstitialAdPreloaderClient.cs

@@ -61,13 +61,11 @@ internal delegate void GADUAdsExhaustedForPreloadIdCallback(IntPtr interstitialA
         public InterstitialAdPreloaderClient()
         {
             _interstitialAdPreloaderClientPtr = (IntPtr)GCHandle.Alloc(this);
-            InterstitialAdPreloaderPtr = Externs.GADUCreateInterstitialAdPreloader(_interstitialAdPreloaderClientPtr);
-
-            Externs.GADUSetInterstitialAdPreloaderCallbacks(
-                InterstitialAdPreloaderPtr,
-                AdAvailableForPreloadIdCallback,
-                AdFailedToPreloadForPreloadIdCallback,
-                AdsExhaustedForPreloadIdCallback);
+            InterstitialAdPreloaderPtr = Externs.GADUCreateInterstitialAdPreloader(
+                    _interstitialAdPreloaderClientPtr,
+                    AdAvailableForPreloadIdCallback,
+                    AdFailedToPreloadForPreloadIdCallback,
+                    AdsExhaustedForPreloadIdCallback);
         }
 
         public bool Preload(string preloadId, PreloadConfiguration preloadConfiguration,
@@ -90,18 +88,30 @@ public bool Preload(string preloadId, PreloadConfiguration preloadConfiguration,
             {
                 preloadConfigurationClient.Request = preloadConfiguration.Request;
             }
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return false;
+            }
             return Externs.GADUInterstitialAdPreloaderPreload(InterstitialAdPreloaderPtr, preloadId,
                                                               preloadConfigRef);
         }
 
         public bool IsAdAvailable(string preloadId)
         {
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return false;
+            }
             return Externs.GADUInterstitialAdPreloaderIsAdAvailable(InterstitialAdPreloaderPtr,
                                                                     preloadId);
         }
 
         public IInterstitialClient DequeueAd(string preloadId)
         {
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return null;
+            }
             var interstitialAdClient = new InterstitialClient();
             var interstitialAdClientPtr = (IntPtr)GCHandle.Alloc(interstitialAdClient);
             var interstitialAd = Externs.GADUInterstitialAdPreloaderGetPreloadedAd(
@@ -114,12 +124,20 @@ public IInterstitialClient DequeueAd(string preloadId)
 
         public int GetNumAdsAvailable(string preloadId)
         {
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return 0;
+            }
             return Externs.GADUInterstitialAdPreloaderGetNumAdsAvailable(InterstitialAdPreloaderPtr,
                                                                          preloadId);
         }
 
         public PreloadConfiguration GetConfiguration(string preloadId)
         {
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return null;
+            }
             var config = Externs.GADUInterstitialAdPreloaderGetConfiguration(
                     InterstitialAdPreloaderPtr, preloadId);
             if (config == IntPtr.Zero)
@@ -140,6 +158,10 @@ public PreloadConfiguration GetConfiguration(string preloadId)
         public Dictionary<string, PreloadConfiguration> GetConfigurations()
         {
             var configurations = new Dictionary<string, PreloadConfiguration>();
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return configurations;
+            }
             var configurationsPtr = Externs.GADUInterstitialAdPreloaderGetConfigurations(InterstitialAdPreloaderPtr);
             // Marshall the Dictionary from configurationsPtr
             var marshalledConfigurations =
@@ -161,11 +183,19 @@ public Dictionary<string, PreloadConfiguration> GetConfigurations()
 
         public void Destroy(string preloadId)
         {
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return;
+            }
             Externs.GADUInterstitialAdPreloaderDestroy(InterstitialAdPreloaderPtr, preloadId);
         }
 
         public void DestroyAll()
         {
+            if (InterstitialAdPreloaderPtr == IntPtr.Zero)
+            {
+                return;
+            }
             Externs.GADUInterstitialAdPreloaderDestroyAll(InterstitialAdPreloaderPtr);
         }