[Unity3D Daily] Editor custom plug-in, use [InitializeOnLoad] attribute

I. Introduction

Custom components have been introduced before, the article link is here:
Unity3D Editor custom window, custom component, Inspector, menu, etc. https://blog.csdn.net/q764424567/article/details/80908614

Today I learned a new attribute InitializeOnLoad
and record it.

Second, use

The main function of this attribute is to run the editor script when starting Unity. The vernacular is that I want to run my script as soon as the project is opened, such as using my plug-in. Once opened, let you know that my plug-in has been updated.
Looking at its official example, we know that it needs a static constructor

using UnityEngine;
using UnityEditor;
 
[InitializeOnLoad]
public class Startup {
    static Startup()
    {
        Debug.Log("Up and running");
    }
}

3. Examples

Example 1: Call the script after the project is loaded

using UnityEditor;
using UnityEngine;
 
[InitializeOnLoad]
class MyClass
{
    static MyClass ()
    {
        EditorApplication.update += Update;
    }
 
    static void Update ()
    {
        Debug.Log("Updating");
    }
}

Example 2: Close the call after loading the window

using UnityEditor;
using UnityEngine;
 
[InitializeOnLoad]
class MyClass
{
    static MyClass ()
    {
        EditorApplication.update += Update;
    }
 
    static void Update ()
    {
    	bool isSuccess = EditorApplication.ExecuteMenuItem("Welcome");
        if (isSuccess) EditorApplication.update -= Update;
    }
}

Example three: window customization

using UnityEditor;
using UnityEngine;


[InitializeOnLoad]
public class MyClass
{
    static MyClass()
    {
        bool hasKey = PlayerPrefs.HasKey("welcome");
        if (hasKey == false)
        {
            PlayerPrefs.SetInt("welcome", 1);
            WelcomeScreen.ShowWindow();
        }
    }
}

public class WelcomeScreen : EditorWindow
{
    private Texture mSamplesImage;
    private Rect imageRect = new Rect(30f, 90f, 350f, 350f);
    private Rect textRect = new Rect(15f, 15f, 380f, 100f);

    public void OnEnable()
    {
        mSamplesImage = LoadTexture("wechat.jpg");
    }

    Texture LoadTexture(string name)
    {
        string path = "Assets/Editor/";
        return (Texture)AssetDatabase.LoadAssetAtPath(path + name, typeof(Texture));
    }

    public void OnGUI()
    {
        GUIStyle style = new GUIStyle();
        style.fontSize = 14;
        style.normal.textColor = Color.white;
        GUI.Label(textRect, "欢迎扫一扫，关注微信号\n这个页面只会显示一次", style);
        GUI.DrawTexture(imageRect, mSamplesImage);
    }

    public static void ShowWindow()
    {
        WelcomeScreen window = GetWindow<WelcomeScreen>(true, "Hello");
        window.minSize = window.maxSize = new Vector2(410f, 470f);
        DontDestroyOnLoad(window);
    }
}