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本文只需要知道三个重点即可

EditorWindow类负责操作窗口

OnGUI方法是进入GUI窗口绘制的关键函数

GUILayout类负责绘制具体内容

 EditorWindow          

         官方文档：EditorWindow - Unity 脚本 API 

        继承了 EditorWindow类的编辑器脚本， 你可以在这个窗口中添加自定义方法，如下图演示将创建一个名为Name，有一个任意内容label的窗口

public class Window : EditorWindow
{
    [MenuItem("MyWindow/window1")]
    private static void MyWindow()
        {
        Window w =EditorWindow.GetWindow<Window>("Name");
        w.Show();

    }
    private void OnGUI() {
        GUILayout.Label("任意内容");
    }
}

EditorGUILayout

        但是在具体绘制这一点，unity提供了一个新的类叫做EditorGUILayout，功能与GUILayout相似加入了自动布局功能

EditorGUILayout - Unity 脚本 API

        举例：每种元素都用常用api

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

public class Window : EditorWindow
{
    [MenuItem("MyWindow/window1")]
    private static void MyWindow()
        {
        Window w =EditorWindow.GetWindow<Window>("Name");
        w.Show();

    }
    //层级和标签
    int layer;
    string tag;

    //选择枚举
    enum E_AnyType{ 
        a=1,
        b=2,
        c=4,
        d=8,
        //要将枚举中的变量定义为2的幂次方,原因是多选枚举时，是按照 或运算 将得出的结果记录下来
        //比如a=1,二进制为0001，b=2，二进制为0010，或运算后结果为0011 = 3 
        //如果不按此规则，a=1，b=2，c=3，当a|b之后，得到的结果就变成了c，而不是多选a和b
    }
    E_AnyType single;
    E_AnyType multiple;

    //字符串选择对应数组值
    int returnNum;
    string[] options = { "op1", "op2", "op3", "op4" };
    int[] result = { 1,2,3,4};

    //关联资源
    GameObject obj;
    int value;//整形输入框
    
    //折叠控件
    bool isHide;
    bool isGroupHide;

    //滑动条
    float slider;
    int intSlider;
    float min;
    float max;
    private void OnGUI() {
        EditorGUILayout.LabelField("页签");
        layer =EditorGUILayout.LayerField(layer);//return int
        tag =EditorGUILayout.TagField("标签");//return sting

        single = (E_AnyType)EditorGUILayout.EnumPopup("单选枚举",single);//return typeof(E_AnyType)
        multiple = (E_AnyType)EditorGUILayout.EnumFlagsField("多选枚举",multiple);

        returnNum = EditorGUILayout.IntPopup("字符串对应数组", returnNum, options, result);
        EditorGUILayout.LabelField(returnNum.ToString());

        EditorGUILayout.DropdownButton(new GUIContent("按钮"), FocusType.Passive);//return bool

        isHide = EditorGUILayout.Foldout(isHide,"折叠控件 bool包裹内容");
        if(isHide){
          
            obj = EditorGUILayout.ObjectField("关联资源对象框", obj, typeof(GameObject), true) as GameObject;
            value = EditorGUILayout.IntField("输入框", value);
        }
        isGroupHide = EditorGUILayout.BeginFoldoutHeaderGroup(isGroupHide,"折叠组控件 必须包括开始和结束");

        EditorGUILayout.EndFoldoutHeaderGroup();

        //开关和开关组类似于折叠控件 关键词：Toggle

        slider =EditorGUILayout.Slider("滑动条",slider,0,1);
        intSlider = EditorGUILayout.IntSlider("整型滑动条",intSlider,0,1);
        //双块滑动条
        EditorGUILayout.MinMaxSlider("双块",ref min,ref max,0,1);

        EditorGUILayout.Space(10);//间隔框
        //提示框
        EditorGUILayout.HelpBox("提示框",MessageType.Warning);//MessageType选择类型

       
    }
}