How to write code for scene change in editor?

Scripting C# & .NET
1

So I’ve figured out previously how to write code for when a scene saves in the editor, but I can’t figure out how to do it for when a scene loads.

From what I understand from the coding api you can add a delegate to EditorSceneManager.activeSceneChanged. The problem is, I’m not exactly sure where to put the code.

I have this:

//First:
using UnityEditor.SceneManagement;

Then this in a method in a class:

EditorSceneManager.activeSceneChanged += HelloWorld;

Then this as the method I want to add to the delegate:

void HelloWorld() {
    Debug.Log("Hello world.");
}

My thought is that it would be put inside of an editor script?

2

Nvm, sorry I think I’ve found a simple solution with this:

using UnityEngine;
using System.Collections;

[ExecuteInEditMode]
public class SceneScript : MonoBehaviour {

    bool HasRunOnce = false;

    void Update () {
        if (HasRunOnce == false) {
            Debug.Log ("One this once.");
            HasRunOnce = true;
        }
    }
}

And then just attach that to a scene game object (or another game object) within the scene. Something I don’t mind doing since I’m using templates for my scenes.

3

You were correct with your delegate but they take parameters so you also need your own function to take those parameters too:

UnityAction<Scene, Scene> activeSceneChanged;
UnityAction<Scene, LoadSceneMode> sceneLoaded;
UnityAction<Scene> sceneUnloaded;

e.g.

void MyClassActiveSceneChanged( Scene arg0 , Scene arg1 )
{
   Debug.Log("Active Scene Changed");
}

The documentation doesn’t actually tell you the parameters which is pretty annoying.

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