// ★変更（必要なものだけ記述すること）
using UnityEngine;
using UnityEditor;

public class MapCreate : EditorWindow // ←変更すること！
{
    static MapCreate window;
    private int yokoSize;
    private int tateSize;
    private GameObject wrapper;

    [MenuItem("TileMap/Create")]
    static void Open()
    {
        window = CreateInstance<MapCreate>();
        window.Show();
    }

    private void OnGUI()
    {
        yokoSize = EditorGUILayout.IntField("横の大きさ", yokoSize);
        tateSize = EditorGUILayout.IntField("縦の大きさ", tateSize);

        if(GUILayout.Button("MapCreate"))
        {
            wrapper = new GameObject("TileMaps");

            for(int i = 0; i < yokoSize; i++)
            {
                for(int j = 0; j < tateSize; j++)
                {
                    GameObject prefab = (GameObject)Resources.Load("Tile");
                    GameObject clone = (GameObject)PrefabUtility.InstantiatePrefab(prefab);
                    clone.transform.localRotation = Quaternion.Euler(90, 0, 0);
                    clone.transform.position = new Vector3(i, 0, j);

                    // 自動的に親子関係を作る
                    clone.transform.SetParent(wrapper.transform);
                }
            }
        }

        if(GUILayout.Button("Close"))
        {
            Close();
        }
    }
}