EditorGUI.MaskField实现多选枚举

效果

枚举

public enum MyFontStyleMask
{
    Bold = 1,
    Italic = 1 << 1,
    Outline = 1 << 2,
}

标签类

using UnityEngine;

public class MyEnumMaskAttribute : PropertyAttribute
{
}

Property Drawer

#if UNITY_EDITOR

using System;
using UnityEditor;
using UnityEngine;

[CustomPropertyDrawer(typeof(MyEnumMaskAttribute))]
public class MyEnumMaskPropertyDrawer : PropertyDrawer
{

    public override void OnGUI(Rect position, SerializedProperty sp, GUIContent label)
    {if (!typeof(Enum).IsAssignableFrom(fieldInfo.FieldType))
        {
            position = EditorGUI.PrefixLabel(position, label);
            EditorGUI.LabelField(position, $"not Enum Type: {fieldInfo.FieldType.Name}");
        }
        else
        {
            sp.intValue = EditorGUI.MaskField(position, label, sp.intValue, sp.enumNames);
        }
    }

}

#endif

测试代码

public class MyEnumMaskTest : MonoBehaviour
{
    [MyEnumMask]
    public MyFontStyleMask m_FontStyleFlags;

    [MyEnumMask]
    public int m_Value;

    void Start()
    {
        Debug.Log($"{m_FontStyleFlags}, {Convert.ToString((int)m_FontStyleFlags, 2).PadLeft(32, '0')}");
        Debug.Log($"Bold: { 0 != (m_FontStyleFlags & MyFontStyleMask.Bold)}");
        Debug.Log($"Italic: {0 != (m_FontStyleFlags & MyFontStyleMask.Italic)}");
        Debug.Log($"Outline: {0 != (m_FontStyleFlags & MyFontStyleMask.Outline)}");
    }

}

注意，不是枚举，EditorGUI.MaskField也能实现位操作，比如像下面这样

var displayOpts = new string[] { "1", "1<<1", "1<<2" };
sp.intValue = EditorGUI.MaskField(position, label, sp.intValue, displayOpts); 

参考

Unity 编辑器扩展十 多选枚举 - 简书 (jianshu.com)