完成https://blog.csdn.net/hankangwen/article/details/122589080

.idea/.idea.UnityEditorExtension/.idea/contentModel.xml

@@ -10,7 +10,10 @@
       <e p="Assets" t="Include">
         <e p="Scripts" t="Include">
           <e p="ComponentTest.cs" t="Include" />
+          <e p="DrawGizmosInScene.cs" t="Include" />
           <e p="Editor" t="Include">
+            <e p="CameraEditor.cs" t="Include" />
+            <e p="EditorExtension2.cs" t="Include" />
             <e p="IngredientDrawer.cs" t="Include" />
             <e p="MyPlayerEditor.cs" t="Include" />
           </e>

Assets/Scenes/Extension2.unity

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Assets/Scenes/Extension2.unity.meta

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Assets/Scripts/DrawGizmosInScene.cs

+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Numerics;
+using UnityEngine;
+using Vector3 = UnityEngine.Vector3;
+
+public class DrawGizmosInScene : MonoBehaviour
+{
+    private void OnDrawGizmosSelected()
+    {
+        Gizmos.color = Color.red;
+        // 画线
+        Gizmos.DrawLine(transform.position, Vector3.zero);
+        // 立方体
+        Gizmos.DrawCube(Vector3.zero, Vector3.one);
+    }
+
+    private void OnDrawGizmos()
+    {
+        Gizmos.DrawSphere(transform.position, 1);
+    }
+}

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Assets/Scripts/Editor/CameraEditor.cs

+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+
+[CustomEditor(typeof(Camera))]
+public class CameraEditor : Editor
+{
+    private void OnSceneGUI()
+    {
+        Camera camera = target as Camera;
+        if (camera != null)
+        {
+            Handles.color = Color.red;
+            var pos = camera.transform.position;
+            Handles.Label(pos, pos.ToString());
+            
+            Handles.BeginGUI();
+            GUI.backgroundColor = Color.red;
+            if (GUILayout.Button("click", GUILayout.Width(200f)))
+            {
+                Debug.LogFormat("click = {0}", camera.name);
+            }
+            GUILayout.Label("Label");
+            Handles.EndGUI();
+        }
+    }
+}

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Assets/Scripts/Editor/EditorExtension2.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+
+public class EditorExtension2
+{
+    [MenuItem("Assets/My Tools/Tools 1", false, 1)]
+    static void MyTools1()
+    {
+        Debug.Log(Selection.activeObject.name);
+    }
+
+    [InitializeOnLoadMethod]
+    static void InitializeOnLoadMethod()
+    {
+        EditorApplication.projectWindowItemOnGUI = ProjectWindowItemOnGUI;
+    }
+
+    private static void ProjectWindowItemOnGUI(string guid, Rect selectionRect)
+    {
+        // 在Project视图中选择一个资源
+        if (Selection.activeObject &&
+            guid == AssetDatabase.AssetPathToGUID(AssetDatabase.GetAssetPath(Selection.activeObject)))
+        {
+            // 设置拓展按钮区域
+            float width = 50f;
+            selectionRect.x += (selectionRect.width - width);
+
+            selectionRect.width = width;
+            GUI.color = Color.yellow;
+            // 点击事件
+            if (GUI.Button(selectionRect, "click"))
+            {
+                Debug.LogFormat("click : {0}", Selection.activeObject.name);
+            }
+
+            selectionRect.x += (selectionRect.width - width * 2);
+            if (GUI.Button(selectionRect, "click2"))
+            {
+                Debug.LogFormat("click2 : {0}", Selection.activeObject.name);
+            }
+
+            GUI.color = Color.white;
+        }
+    }
+
+    [MenuItem("GameObject/My Create/Cube", false, 0)]
+    static void CreateCube()
+    {
+        GameObject.CreatePrimitive(PrimitiveType.Cube);
+    }
+
+    [InitializeOnLoadMethod]
+    static void InitializeOnLoadMethod2()
+    {
+        EditorApplication.hierarchyWindowItemOnGUI = delegate(int instanceID, Rect selectionRect)
+        {
+            //在Hierarchy视图中选择一个资源
+            if (Selection.activeObject &&
+                instanceID == Selection.activeObject.GetInstanceID())
+            {
+                //设置拓展按钮区域
+                float width = 50f;
+                float height = 18f;
+                selectionRect.x += (selectionRect.width - width);
+                selectionRect.width = width;
+                selectionRect.height = height;
+                GUI.color = Color.yellow;
+                //点击事件
+                if (GUI.Button(selectionRect, "click"))
+                {
+                    Debug.LogFormat("click : {0}", Selection.activeObject.name);
+                }
+
+                GUI.color = Color.white;
+            }
+        };
+    }
+
+    [InitializeOnLoadMethod]
+    static void InitializeOnLoadDuringSceneGui()
+    {
+        SceneView.duringSceneGui += delegate(SceneView sceneView)
+        {
+            Handles.BeginGUI();
+
+            GUI.Label(new Rect(0f, 0f, 50f, 15f), "标题");
+            GUI.Button(new Rect(0f, 20f, 50f, 20f), "click");
+
+            Handles.EndGUI();
+        };
+    }
+    
+    [MenuItem("MenuTest/Test", false, 3)]
+    static void Test3()
+    {
+        //勾选中框的菜单
+        var menuPath = "MenuTest/Test";
+        bool mchecked = Menu.GetChecked(menuPath);
+        Menu.SetChecked(menuPath, !mchecked);
+    }
+}
\ No newline at end of file

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README.md

@@ -6,4 +6,6 @@ Unity编辑器拓展：自定义Unity面板
 
 [Unity 扩展编辑器](https://blog.csdn.net/hankangwen/article/details/122589080?spm=1001.2014.3001.5501)
 
-[Unity Editor拓展编辑器](https://mp.weixin.qq.com/s/ka5mfGBUTR6zqneqYyW8Hg)
+[Unity Editor拓展编辑器](https://blog.csdn.net/hankangwen/article/details/122589080)
+
+