Added ReadOnlyOnPlayField Attribute.

Editor/ReadOnlyOnPlayFieldDrawer.cs

@@ -0,0 +1,18 @@
+using Runtime;
+using UnityEditor;
+using UnityEngine;
+
+namespace Utils
+{
+    [CustomPropertyDrawer(typeof(ReadOnlyOnPlayFieldAttribute))]
+    public class ReadOnlyOnPlayFieldDrawer : PropertyDrawer
+    {
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            var state = Application.isPlaying;
+            if (state) GUI.enabled = false;
+            EditorGUI.PropertyField(position, property, label, true);
+            if (state) GUI.enabled = true;
+        }
+    }
+}

Editor/ReadOnlyOnPlayFieldDrawer.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 9c45448d04584b318be7490a85ae4681
+timeCreated: 1657132838

Runtime/ReadOnlyOnPlayFieldAttribute.cs

@@ -0,0 +1,6 @@
+using UnityEngine;
+
+namespace Utils
+{
+    public class ReadOnlyOnPlayFieldAttribute : PropertyAttribute { }
+}

Runtime/ReadOnlyOnPlayFieldAttribute.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 751004c02d9af6559a8f5c714cf58568
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ru.shazbot.utils",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "displayName": "Utils",
   "description": "Utility useful for almost any project.",
   "licensesUrl": "https://git.shazbot.ru/Utils.git/tree/LICENSE.md",