Executeineditmode property details

ExecuteInEditMode Attribute is used to EditMode You can also execute scripts under .Unity By default , Scripts are executed only when they are running , After adding this attribute , Don't run the program , Can also execute scripts .

And PlayMode The difference is , Functions don't keep executing .

Update : Only when an object in the scene changes , Only called .

OnGUI : When GameView Received a Event Call when .

OnRenderObject And other rendering callback functions : SceneVidw perhaps GameView Redraw time , call .

Awake And Start Call rules ：

Awake： call on load .

Start： Called on first activation .

This is consistent with the call rules in the run mode . See 《unity----- Function execution order 》.

It should be noted that , Because it can run in both modes , all , The moment you switch modes , It's worth staying Take it easy .
Whether from edit mode to run mode , Or from run mode to edit mode ,unity Will reload resources , therefore ：

When it's time to MonoBehavior Given in the editor GameObject When ,Awake, Start Will be carried out .
When Play After the button is pressed and the game starts ,Awake, Start Will be carried out .
When Play After the button stops ,Awake, Start Will be executed again .
When opened in the editor, it contains the MonoBehavior When I was in the middle of the scene ,Awake, Start Will be carried out .

Usage method ：

using UnityEngine;
using System.Collections;
 
[ExecuteInEditMode]
public class Example : MonoBehaviour {
    public Transform target;
    void Update() {
        if (target)
            transform.LookAt(target);
        
    }
}