Return a ScriptableObject's original value after quit Playmode in Unity

Question

I have a ScriptableObject like this

and during Playmode I adjust the CurrenHealthValue

and when I exist the Playmode the CurrentHealthValue=80 doesn't return to 40, I know it was how ScriptableObject works but I want to know if there is any way which I can automatically return the 40 original value after exist the Playmode instead of manually rewrite the value to 40 before start the new Playmode.

One way would be to instead of using the original SO create a runtime copy `Instantiate(yourSO)` .. won't work of course if multiple components access the same SO — derHugo, Feb 20 '23 at 17:01
Here are some ideas https://answers.unity.com/questions/1664323/how-are-you-resetting-your-scriptable-objects-betw.html — derHugo, Feb 20 '23 at 17:02

score 5 · Answer 1 · answered Feb 22 '23 at 03:58

In situations like this, I've used the EditorJsonUtility to save a copy of the initial object as JSON, and then overwritten the target object once I've finished.

In this case, the code would look something similar to:

using UnityEngine;
#if UNITY_EDITOR // makes intent clear.
using UnityEditor;
#endif

[CreateAssetMenu ( fileName = "TestScriptableObject", menuName = "TestScriptableObject", order = 1 )]
public class TestScriptableObject : ScriptableObject
{
    public int Field1;
    public float Field2;
    public Vector2 Field3;

#if UNITY_EDITOR
    [SerializeField] private bool _revert;
    private string _initialJson = string.Empty;
#endif

    private void OnEnable ( )
    {
#if UNITY_EDITOR
        EditorApplication.playModeStateChanged -= OnPlayModeStateChanged;
        EditorApplication.playModeStateChanged += OnPlayModeStateChanged;
#endif
    }

#if UNITY_EDITOR
    private void OnPlayModeStateChanged ( PlayModeStateChange obj )
    {
        switch ( obj )
        {
            case PlayModeStateChange.EnteredPlayMode:
                _initialJson = EditorJsonUtility.ToJson ( this );
                break;

            case PlayModeStateChange.ExitingPlayMode:
                EditorApplication.playModeStateChanged -= OnPlayModeStateChanged;
                if ( _revert )
                    EditorJsonUtility.FromJsonOverwrite ( _initialJson, this );
                break;
        }
    }
#endif
}

This is so good! More people need to know about this. – shadesbelow Mar 30 '23 at 21:36 — shadesbelow, Mar 30 '23 at 21:36
Works good as base class – Estus Flask Sep 02 '23 at 11:58 — Estus Flask, Sep 02 '23 at 11:58

score 2 · Answer 2 · answered Feb 20 '23 at 16:58

You can actually subscribe your ScriptableObject class to Editor's play mode state changes. A small example which demonstrate that:

#if UNITY_EDITOR
    using UnityEditor;
#endif
using UnityEngine;

namespace SomeNameSpace
{
    [CreateAssetMenu(fileName = "TestScriptableObject", menuName = "ScriptableObjects/")]
    public class TestScriptableObject : ScriptableObject
    {
        private const int DefaultHealth = 120;
        
        public int Health = 60;

        private void OnEnable()
        {
#if UNITY_EDITOR
            // Subscribe for the "event"
            EditorApplication.playModeStateChanged += LogPlayModeState;
#endif
        }

        private void OnDisable()
        {
#if UNITY_EDITOR
            // Don't forget to unsubscribe
            EditorApplication.playModeStateChanged -= LogPlayModeState;
#endif
        }

#if UNITY_EDITOR
        private void LogPlayModeState(PlayModeStateChange state)
        {
            if (state == PlayModeStateChange.ExitingPlayMode)
            {
                // Reset / Set the default health value
                Health = DefaultHealth;
            }
        }
#endif
    }
}

A hardcoded default value isn't really helpful though .. OP wants to return to what was in the Inspector before — derHugo, Feb 20 '23 at 16:59
It was just a suggestion. You can save the default value when the game has entered play mode and 'reset' the value in exiting playing mode. — hardartcore, Feb 21 '23 at 09:36

Return a ScriptableObject's original value after quit Playmode in Unity

2 Answers2