Set App Icon on PreBuild

Hello,

I'm trying to set my App Icon for ios on PreprocessBuild, So I'm using the interface IPreprocessBuild, and Trying to load it from local space, but I don't it update in xcode. this is my Code:

 private void UpdatePlayerSettings()
 {
     if (_book == null)
     {
         Debug.LogError("Wtf The Book Settings is Nullllllllllll !!!!!!!!!");
         return;
     }
     PlayerSettings.productName = _book.ApplicationName;
     PlayerSettings.applicationIdentifier = _book.IosProductIdentifier;
     PlayerSettings.iOS.appleEnableAutomaticSigning = _book.AutomaticSigning;
     if (!UnityEditor.PlayerSettings.iOS.appleEnableAutomaticSigning)
         UnityEditor.PlayerSettings.iOS.iOSManualProvisioningProfileID = _book.ProfileId;
     PlayerSettings.bundleVersion = _book.Version.ToString(CultureInfo.InvariantCulture);
     PlayerSettings.iOS.buildNumber = _book.Build.ToString();
     Screen.orientation = _book.Orientation;
     Screen.autorotateToLandscapeLeft = _book.LandscapeLeft;
     Screen.autorotateToLandscapeRight = _book.LandscapeRight;
     Screen.autorotateToPortrait = _book.Portrait;
     Screen.autorotateToPortraitUpsideDown = _book.PortraitUpsideDown;
     var iconSizes = PlayerSettings.GetIconSizesForTargetGroup(BuildTargetGroup.iOS);
     var icons = new Texture2D[iconSizes.Length];
     for (var i = 0; i < iconSizes.Length; i++) 
     {
         var assetPath = string.Format("Assets/BooksIcon/{0}/Icon-{1}.png", "AbaOseBushot", iconSizes[i]);
         try 
         {
             icons[i] = AssetDatabase.LoadAssetAtPath<Texture2D>(assetPath);
             if (icons[i] == null)
                 Debug.LogWarning(string.Format("Unable to load icon at '{0}' due to asset not found", assetPath));
         }
         catch (System.Exception e) 
         {
             Debug.LogWarning(string.Format("Unable to load icon at '{0}' due to exception '{1}'", assetPath, e));
         }
     }
     PlayerSettings.SetIconsForTargetGroup(BuildTargetGroup.iOS, icons);
     
 }

Other settings are getting updated, but the icons aren't, what am I doing wrong?

Thank