Unity3D研究院之脚本自动添加tag和Layer

using System;
using System.Collections;
using System.Reflection;
using UnityEditor;
using UnityEngine;

public class NewBehaviourScript :AssetPostprocessor
{

	static void OnPostprocessAllAssets (string[] importedAssets, string[] deletedAssets,string[] movedAssets, string[] movedFromAssetPaths) 
	{
		foreach(string s in importedAssets)
		{
			if (s.Equals("Assets/NewBehaviourScript.cs"))
			{
				//增加一个叫momo的tag
				AddTag("momo");
				//增加一个叫ruoruo的layer
				AddLayer("ruoruo");
				return ;
			}
		}   
	}

	static void AddTag(string tag)
	{
		if(!isHasTag(tag))
		{
			SerializedObject tagManager = new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/TagManager.asset")[0]);
			SerializedProperty it = tagManager.GetIterator();
			while (it.NextVisible(true))
			{
				if(it.name == "tags")
				{
					for (int i = 0; i < it.arraySize; i++) 
					{ 
						SerializedProperty dataPoint = it.GetArrayElementAtIndex(i);
						if(string.IsNullOrEmpty(dataPoint.stringValue)){
							dataPoint.stringValue = tag;
							tagManager.ApplyModifiedProperties();
							return;
						}
					}
				}
			}
		}
	}

	static void AddLayer(string layer)
	{
		if(!isHasLayer(layer))
		{
			SerializedObject tagManager = new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/TagManager.asset")[0]);
			SerializedProperty it = tagManager.GetIterator();
			while (it.NextVisible(true))
			{
				if(it.name.StartsWith("User Layer"))
				{
					if(it.type == "string" )
					{
						if(string.IsNullOrEmpty(it.stringValue)){
							it.stringValue  = layer;
							tagManager.ApplyModifiedProperties();
							return;
						}
					}
				}
			}
		}
	}

	static bool isHasTag(string tag)
	{
		for (int i = 0; i < UnityEditorInternal.InternalEditorUtility.tags.Length; i++) {
			if (UnityEditorInternal.InternalEditorUtility.tags[i].Contains(tag))
				return true;
		}
		return false;
	}

	static bool isHasLayer(string layer)
	{
		for (int i = 0; i < UnityEditorInternal.InternalEditorUtility.layers.Length; i++) {
			if (UnityEditorInternal.InternalEditorUtility.layers[i].Contains(layer))
				return true;
		}
		return false;
	}
}