search for unity's inspector

SearchInspector.cs

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

namespace Junk.Utilities
{
    /// <summary>
    /// Thanks to Ryiah and the collective stolen knowledge of the internet via chatgpt
    /// https://forum.unity.com/threads/still-no-search-field-in-the-inspector.1555850/#post-9697247
    /// </summary>
    public static class SearchInspector
    {
        private         static   string                               searchString                  = "Search...";
        private           static List<SerializedProperty>             matchingProperties            = new List<SerializedProperty>();
        private          static  Dictionary<string, SerializedObject> serializedObjectsCache        = new Dictionary<string, SerializedObject>();

        [InitializeOnLoadMethod]
        static void Init()
        {
            UnityEditor.Editor.finishedDefaultHeaderGUI  += OnDisplaySearch;
        }

        static void OnDisplaySearch(UnityEditor.Editor editor)
        {
            var selectedGameObject = editor.target as GameObject;
            if (selectedGameObject == null)
                return;

            var target = editor.target;
            
            EditorGUI.BeginChangeCheck();
            searchString = EditorGUILayout.TextField("", searchString);
            if (EditorGUI.EndChangeCheck())
            {
                if (!string.IsNullOrWhiteSpace(searchString))
                {
                    SearchFieldsByDisplayName(target);
                }
                else
                {
                    matchingProperties.Clear(); // Clear results if search string is cleared
                }
            }
     
            if (matchingProperties.Any())
            {
                // indent
                
                ++EditorGUI.indentLevel;
                // Store the current label width
                float currentLabelWidth = EditorGUIUtility.labelWidth;

                // Set the desired label width
                EditorGUIUtility.labelWidth = 200; // Adjust this value to your preference
                GUILayout.Label("Results:", EditorStyles.boldLabel);
                foreach (SerializedProperty property in matchingProperties)
                {
                    SerializedObject serializedObject = serializedObjectsCache[property.propertyPath];
                    serializedObject.Update();
                    EditorGUILayout.PropertyField(property, true);
                    
                    serializedObject.ApplyModifiedProperties();
                }
                --EditorGUI.indentLevel;
                
                // Restore the label width
                EditorGUIUtility.labelWidth = currentLabelWidth;
            }
        }
        
        private static void SearchFieldsByDisplayName(Object searchTarget)
        {
            matchingProperties.Clear();
            serializedObjectsCache.Clear();
            if (searchTarget == null) return;
     
            Component[] components = ((GameObject)searchTarget).GetComponents<Component>();
            foreach (Component component in components)
            {
                SerializedObject   serializedObject   = new SerializedObject(component);
                SerializedProperty serializedProperty = serializedObject.GetIterator();
                bool               enterChildren      = true;
     
                while (serializedProperty.NextVisible(enterChildren))
                {
                    if (serializedProperty.displayName.ToLowerInvariant().Contains(searchString.ToLowerInvariant()))
                    {
                        matchingProperties.Add(serializedProperty.Copy());
                        serializedObjectsCache[serializedProperty.propertyPath] = serializedObject;
                    }
                    enterChildren = false;
                }
            }
        }
    }
    
}