Creat attribute [ReadOnly] with unity editor

ReadOnlyAttribute.cs

using UnityEditor;
using UnityEngine;

public class ReadOnlyAttribute : PropertyAttribute
{
 
}
 
[CustomPropertyDrawer(typeof(ReadOnlyAttribute))]
public class ReadOnlyDrawer : PropertyDrawer
{
	public override float GetPropertyHeight(SerializedProperty property,
		GUIContent label)
	{
		return EditorGUI.GetPropertyHeight(property, label, true);
	}
 
	public override void OnGUI(Rect position,
		SerializedProperty property,
		GUIContent label)
	{
		GUI.enabled = false;
		EditorGUI.PropertyField(position, property, label, true);
		GUI.enabled = true;
	}
}