[Unity] CustomEditor

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

[CustomEditor(typeof (MapGenerator))]
public class MapGeneratedEditor : Editor {

    public override void OnInspectorGUI()
    {
        MapGenerator mapGenerator = (MapGenerator)target;
        if (DrawDefaultInspector())
        {
            if(mapGenerator.autoUpdate)
            {
                mapGenerator.GenerateMap();
            }
        }
        if(GUILayout.Button("Generate"))
        {
            mapGenerator.GenerateMap();
        }

    }

}