Unity Editor スクリプト： SortingLayer 名を取得する

GetSortingLayerNames.cs

using UnityEngine;
using UnityEditor;

{
  // SortingLayer 名の取得
  var tagManager = new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/TagManager.asset")[0]);
  var sortingLayer = tagManager.FindProperty("m_SortingLayers");
  for (int i = 0; i < sortingLayer.arraySize; ++i) {
    string tag = sortingLayer.GetArrayElementAtIndex(i).displayName;
    // TODO : 
  }
}