Custom Editor: Objectfield clears on play

Question

Hi there Uniteers o/ I am in the need of help once again. I am now trying to mess around with my own custom Editor for a script, though I am having issues with the EditorGuiLayout.ObjectField(); I have created an ObjectField, which shows in the inspector. In the ObjectField I assign a GameObject from the scene. As soon I play the scene, the ObjectField simply clear itself, and then UnassignedReferenceExceptions starts to pop up in the console. I am pretty sure it is just me who is missing some vital part / understanding of using custom editors. The code I use is:

 using UnityEngine;
 using System.Collections;
 using UnityEditor;
 
 [System.Serializable]
 [CustomEditor (typeof(IronManScript))]
 public class IronManScriptEditor : Editor{
     public TransitionMethod _TransistionMethod;
     public GameObject _TargetObject;
     
     public override void OnInspectorGUI()
     {
         IronManScript _TargetSys = (IronManScript)target;
         GUILayout.Label ("Transition methods", EditorStyles.boldLabel);
         _TransistionMethod = (TransitionMethod)EditorGUILayout.EnumPopup("Transition: ", _TransistionMethod);
         
         _TargetObject = (GameObject)EditorGUILayout.ObjectField("Target: ", _TargetObject, typeof(GameObject), true);        
         _TargetSys._Transition = _TransistionMethod;
         _TargetSys._Target = _TargetObject;
         
     }
 
 }

The "IronManScript" is the class in which takes all my inspector values, and I am (nearly) sure that the IronManScript doesn't intefer with the custom editor.

EDIT: I just figured out, the Objectfield's value isn't cleared if I change the ObjectField value during runtime. The Objectfield only clears itself if you assign the value before you play the scene.

EDIT EDIT ** Okay, by the look of it it could be something about serializing. As far as I have read, it is about custom classes who doesn't extends from Monobehavior have to be serialized with [System.Serializable]. But even when implementing it it doesn't work. I have updated the code.

Answer 1

Best Answer

Answer by Freaking-Pingo · Nov 25, 2012 at 06:56 PM

Okay, I am not really hundred percent sure of what I did, but I got it fixed. Following this persons class setup, I got it working: http://answers.unity3d.com/questions/235595/custom-editor-losing-settings-on-play.html

Apparently, the object which is suppose to be assigned in the inspector, has to be in a custom made class which doesn't extend from Monobehavior, followed by utillizing [System.Serializable]

Why I don't really know, but it works. About the EditorUtillity.SetDirty(target); it isn't necessary. It still works even without it.

If anyone is stuck with the same problem, feel free to contact me and I'll share my experience.

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Answer 2

Hi i know it's an old post, but i have a similar error and i can't find a way to fix this. Editor:

 [CustomEditor(typeof(TilesDB))]
 public class TileEditor : Editor
 {
     public List<Object> source = new List<Object>();
     public List<Color> color = new List<Color>();
     public List<string> names = new List<string>();
 
     GUIStyle myStyle;
 
     void OnGui() {
         myStyle = new GUIStyle(GUI.skin.textField);
     }
 
     public override void OnInspectorGUI(){
         base.OnInspectorGUI();
 
         myStyle.alignment = TextAnchor.MiddleCenter;
         TilesDB tiles = (TilesDB)target;
 
         Init(tiles);
         
         for(int i = 0; i < tiles.custom_tiles.Count; i++){
             GUILayout.BeginHorizontal("", myStyle);
                 EditorGUIUtility.labelWidth = 1f;
                 EditorGUILayout.LabelField( "Tile: " + i, myStyle);
                 GUILayout.BeginVertical();
                     GUILayout.FlexibleSpace();
                         names[i] = EditorGUILayout.TextField("Tile Name", names[i] ,myStyle);
                     GUILayout.FlexibleSpace();
                 GUILayout.EndVertical();
                 source[i] = EditorGUILayout.ObjectField(source[i], typeof(Object), true, GUILayout.Width(80), GUILayout.Height(80));
                 color[i] = EditorGUILayout.ColorField(color[i], GUILayout.Width(80), GUILayout.Height(80));
             GUILayout.EndHorizontal();
             tiles.AddTile(source[i], color[i]);
         }
 
         GUILayout.BeginHorizontal("", myStyle);
         if(GUILayout.Button("Add Tile", GUILayout.Width(100), GUILayout.Height(100))){
             tiles.Add();
         }
 
         if(GUILayout.Button("Delete Last Tile", GUILayout.Width(100), GUILayout.Height(100))){//
             tiles.DeleteLast();
         }
         GUILayout.EndHorizontal();
     }
 
     public void Init(TilesDB tiles){
         for(int i = 0; i < tiles.custom_tiles.Count; i++){
             source.Add(new Object());
             color.Add(new Color());
             names.Add("Tile Name");
         }
     }
 }

Script:

 using System.Linq;
 using System.Collections.Generic;
 using UnityEngine;
 
 
 [System.Serializable]
 public struct ImageTiles{
     public GameObject tile;
     public Color color;
 }
 
 [System.Serializable]
 public class TilesDB : MonoBehaviour{
     [SerializeField]
     public List<ImageTiles> custom_tiles;//add them on start to tiles and check
     private static Dictionary<GameObject, Color> tiles = new Dictionary<GameObject, Color>();   //Save every tile and it's PNG color
 
     void Start() {
         foreach(ImageTiles it in custom_tiles){
             //tiles.Add(it.tile, it.color);       //save all tiles on the inspector inside tile variable
         }
     }
 
     public void Add(){
         custom_tiles.Add(new ImageTiles());//
     }
 
     public void AddTile(Object tile, Color color){
         if(tile == null){
             Debug.LogError("You created a new Tile but forgot to assign that a GameObject");
             return;
         }
 
         GameObject _tile = GetTile(tile.name);
         if(_tile == null){
             Debug.LogError("Tile does not exists.");
             return;
         }
 
         foreach(KeyValuePair<GameObject, Color> t in tiles){         //look for every tile saved on the Dictionary
             if(t.Key == _tile)return;
         }
 
         tiles.Add(_tile, color);
     }
 
     public GameObject GetTile(string name){
         
         List<GameObject> temp_tiles = Resources.LoadAll<GameObject>("Prefabs/Tiles/").ToList<GameObject>();
 
         foreach(GameObject tile in temp_tiles){
             if(name == tile.name)return tile;
         }
         return null;
     }
 
     public void DeleteLast(){
         custom_tiles.RemoveAt(custom_tiles.Count - 1);
     }
 
     public static GameObject GetTile(Color hexColor){                   //Get Tile GameObject based on the Color recieved
         foreach(KeyValuePair<GameObject, Color> tile in tiles){         //look for every tile saved on the Dictionary
             if(tile.Value == hexColor)return tile.Key;                  //If Color matches, then return Tile's GameObject
         }
 
         Debug.LogError("This Color is not saved -> " + hexColor + "\n Make sure to add all Tiles inside TilesDB.SetTiles()");   //Error message + hint
         return null;
     }
 }

i can set everything on the inspector and it should save it on Dictionary, but when i press start button, custom editor disappear and Dictionary got cleared. Really i can't fix this, please need help.

Custom Editor: Objectfield clears on play

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