Objects in Custom Editor Resetting on Play

Questions & Answers
1

I’m trying to have a list of steps shown in the custom editor and then updating the serialized Object with some values. Whenever I press play the StepRestriction.referenceStep and StepRestriction.stepIndex are reset to the first item in the steps list and 0. I’ve looked on previous forums and the general response is to add serializedObject.Update() and serializedObject.ApplyModifiedProperties(), but I have both of these. I’m lost on why they keep resetting.

using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

namespace TutorialSystem
{
...
    public class StepRestriction : MonoBehaviour
    {
        [SerializeField]
        RestrictionType restrictionType;
        [SerializeField]
        TutorialManager tutorialManager;

        [SerializeField]
        TutorialStep referenceStep;

        [SerializeField]
        public int stepIndex;
 
        [SerializeField]
        internal List<RestrictionPair> restrictions = new List<RestrictionPair>();

...
    }

#if UNITY_EDITOR
    [CustomEditor(typeof(StepRestriction))]
    public class StepRestrictionInspector : Editor
    {
        SerializedProperty p_restrictionType;
        SerializedProperty p_tutorialManager;
        SerializedProperty p_stepIndex;
        SerializedProperty p_onStep;
        SerializedProperty p_referenceStep;

        int selectedStepIndex;

        private void OnEnable()
        {
            p_restrictionType = serializedObject.FindProperty("restrictionType");
            p_tutorialManager = serializedObject.FindProperty("tutorialManager");
            p_stepIndex = serializedObject.FindProperty("stepIndex");
            p_onStep = serializedObject.FindProperty("onStep");
            p_referenceStep = serializedObject.FindProperty("referenceStep");
        }

        public override void OnInspectorGUI()
        {
            serializedObject.Update();
...
            EditorGUILayout.PropertyField(p_tutorialManager);
            ShowSteps();
            ShowRestrictions();

            serializedObject.ApplyModifiedProperties();
        }
...
        private void ShowSteps()
        {
            TutorialManager manager = 
                      (TutorialManager)p_tutorialManager.objectReferenceValue;
            if (manager == null) return;

            TutorialStep[] steps = manager.GetSteps();

            //create the array for the step names
            string[] stepStrings = new string[steps.Length];
            for (int i = 0; i < steps.Length; i++)
            {
                stepStrings _= steps*.name;*_

}

//set the step from the popup
selectedStepIndex = EditorGUILayout.Popup(new GUIContent(“Step”),
selectedStepIndex, stepStrings);
p_stepIndex.intValue = selectedStepIndex;
p_referenceStep.objectReferenceInstanceIDValue =
steps[selectedStepIndex].GetInstanceID();
}
}

#endif
}

2

it is a bit a wild guess in the dark but I don’t see you writing back to p_stepIndex.value or drawing it a property field which would do the same under the hood.
Additionally it might be necessary to explizitly make TutorialStep serializable in its own class, but the int should work that way.