一、新建运行时TitleAttribute.cs脚本

using UnityEngine;

public class TitleAttribute : PropertyAttribute
{
    public string newTitle { get ; private set; }    
    public TitleAttribute( string title )
    {
        newTitle = title ;
    }
}

二、新建Editor目录中的脚本

using UnityEngine;
using UnityEditor;

[CustomPropertyDrawer(typeof(TitleAttribute))]
public class TitleAttributeDrawer : PropertyDrawer
{
    public override void OnGUI( Rect position, SerializedProperty property, GUIContent label )
    {
        EditorGUI.PropertyField(position, property, new GUIContent( (attribute as TitleAttribute).newTitle ));
    }
}

三、使用

在需要用的地方添加[Title]标记：

    [Title("角色ID")]
    public string actorId;

四、效果