feat: add idfv getter method

Author: uerceg

Assets/Adjust/Unity/Adjust.cs

@@ -779,6 +779,27 @@ public static string getIdfa()
 #endif
         }
 
+        public static string getIdfv()
+        {
+            if (IsEditor())
+            {
+                return string.Empty;
+            }
+
+#if UNITY_IOS
+            return AdjustiOS.GetIdfv();
+#elif UNITY_ANDROID
+            Debug.Log("[Adjust]: Error! IDFV is not available on Android platform.");
+            return string.Empty;
+#elif (UNITY_WSA || UNITY_WP8)
+            Debug.Log("[Adjust]: Error! IDFV is not available on Windows platform.");
+            return string.Empty;
+#else
+            Debug.Log(errorMsgPlatform);
+            return string.Empty;
+#endif
+        }
+
         public static string getSdkVersion()
         {
             if (IsEditor())

Assets/Adjust/iOS/AdjustUnity.mm

@@ -412,6 +412,21 @@ void _AdjustAppWillOpenUrl(const char* url) {
         return idfaCStringCopy;
     }
 
+    char* _AdjustGetIdfv() {
+        NSString *idfv = [Adjust idfv];
+        if (nil == idfv) {
+            return NULL;
+        }
+
+        const char* idfvCString = [idfv UTF8String];
+        if (NULL == idfvCString) {
+            return NULL;
+        }
+
+        char* idfvCStringCopy = strdup(idfvCString);
+        return idfvCStringCopy;
+    }
+
     char* _AdjustGetAdid() {
         NSString *adid = [Adjust adid];
         if (nil == adid) {

Assets/Adjust/iOS/AdjustiOS.cs

@@ -79,6 +79,9 @@ private static extern void _AdjustTrackEvent(
         [DllImport("__Internal")]
         private static extern string _AdjustGetIdfa();
 
+        [DllImport("__Internal")]
+        private static extern string _AdjustGetIdfv();
+
         [DllImport("__Internal")]
         private static extern string _AdjustGetAdid();
 
@@ -467,6 +470,11 @@ public static string GetIdfa()
             return _AdjustGetIdfa();
         }
 
+        public static string GetIdfv()
+        {
+            return _AdjustGetIdfv();
+        }
+
         public static string GetAdid()
         {
             return _AdjustGetAdid();