Better Defines for Unity3D

BetterDefines.cs

using System.Collections.Generic;
using UnityEditor;

namespace Borodar.YesNoMath.Editor
{
    [InitializeOnLoad]
    public class BetterDefines
    {

        static BetterDefines()
        {
            var isEditor =
            #if UNITY_EDITOR
                true;
            #else
                false;
            #endif

            ToggleFlag("GPGS_ENABLED", !isEditor, BuildTargetGroup.Android);
            ToggleFlag("GAME_CENTER_ENABLED", !isEditor, BuildTargetGroup.iOS);
        }

        //---------------------------------------------------------------------
        // Helpers
        //---------------------------------------------------------------------

        private static void ToggleFlag(string targetFlag, bool enable, params BuildTargetGroup[] supportedPlatforms)
        {
            foreach (var targetPlatform in supportedPlatforms)
            {
                var scriptDefines = PlayerSettings.GetScriptingDefineSymbolsForGroup(targetPlatform);
                var flags = new List<string>(scriptDefines.Split(';'));

                if (flags.Contains(targetFlag))
                {
                    if (!enable) flags.Remove(targetFlag);
                }
                else
                {
                    if (enable) flags.Add(targetFlag);
                }

                var result = string.Join(";", flags.ToArray());

                if (scriptDefines != result)
                {
                    PlayerSettings.SetScriptingDefineSymbolsForGroup(targetPlatform, result);
                }
            }
        }

    }
}