Unity打包报错：找不到'Editor'类型或命名空间（版本升级后）

原本在Unity 2020.3.0f1中可正常打包的Items.cs脚本，升级至2021.3.9f1后打包时出现编译错误。该脚本包含继承自Editor的自定义编辑器类，并引入了UnityEditor命名空间。

Assets\Inventory\Items.cs(31,31): error CS0246: The type or namespace name 'Editor' could not be found (are you missing a using directive or an assembly reference?)
Assets\Inventory\Items.cs(30,5): error CS0246: The type or namespace name 'CustomEditorAttribute' could not be found (are you missing a using directive or an assembly reference?)
Assets\Inventory\Items.cs(30,5): error CS0246: The type or namespace name 'CustomEditor' could not be found (are you missing a using directive or an assembly reference?)
Assets\Inventory\Items.cs(32,28): error CS0115: 'Items.ItemsEditor.OnInspectorGUI()': no suitable method found to override

using UnityEngine;
using UnityEditor;

public class Items : MonoBehaviour {
   public enum itemTypes { Weapon, Potion, Amulet }
   public enum potionType { Health, Poison, Strong, Beer }
   public enum amuletType { Health, Defense, Speed }

   [Header("Main Settings")]
   public itemTypes ItemTypes;
   [HideInInspector] public GameObject Model;
   [HideInInspector] public Texture2D Icon;
   [HideInInspector] public string itemName;
   [HideInInspector] public int itemNum;

   // Weapon
   [HideInInspector] public float damage;
   [HideInInspector] public float atackSpeed;
   [HideInInspector] public int broken;

   // Potion
   [HideInInspector] public potionType Potion = potionType.Health;
   [HideInInspector] public float healthOfset;
   [HideInInspector] public bool processingEffect;

   // Amulet
   [HideInInspector] public amuletType Amulet = amuletType.Health; 
   [HideInInspector] public float amuletValue;
    
   [CustomEditor(typeof(Items))]
   public class ItemsEditor : Editor {
      public override void OnInspectorGUI() {
         base.OnInspectorGUI();
         Items items = (Items) target;
         DrawMain(items);
         EditorGUILayout.Space();
       
         switch (items.ItemTypes) {
            case itemTypes.Weapon:
               WeaponSettings();
               break;
            case itemTypes.Potion:
               PotionSettings();
               break;
            case itemTypes.Amulet:
               AmuletSettings();
               break;
         }
         serializedObject.ApplyModifiedProperties();
      }

      void DrawMain(Items items) {
         EditorGUILayout.PropertyField(serializedObject.FindProperty("Icon"));
         EditorGUILayout.PropertyField(serializedObject.FindProperty("Model"));
         EditorGUILayout.PropertyField(serializedObject.FindProperty("itemNum"));
         EditorGUILayout.PropertyField(serializedObject.FindProperty("itemName"));
         EditorGUILayout.Space();
      }

      void WeaponSettings() {
         EditorGUILayout.PropertyField(serializedObject.FindProperty("damage"));
         EditorGUILayout.PropertyField(serializedObject.FindProperty("atackSpeed"));
      }

      void PotionSettings() {
         EditorGUILayout.PropertyField(serializedObject.FindProperty("Potion"));
         EditorGUILayout.PropertyField(serializedObject.FindProperty("healthOfset"));
         EditorGUILayout.PropertyField(serializedObject.FindProperty("processingEffect"));
      }

      void AmuletSettings() {
         EditorGUILayout.PropertyField(serializedObject.FindProperty("Amulet"));
         EditorGUILayout.PropertyField(serializedObject.FindProperty("amuletValue"));
      }
   }
}

问题根源是Unity 2021版本对编辑器代码的打包逻辑更严格：UnityEditor命名空间下的类仅在编辑器环境中可用，打包时会被自动排除，导致脚本找不到相关类型。

解决步骤如下：

1. 拆分脚本：将运行时代码与编辑器代码分离
   • 创建Items.cs，仅保留运行时逻辑：

     using UnityEngine;
     
     public class Items : MonoBehaviour {
        public enum itemTypes { Weapon, Potion, Amulet }
        public enum potionType { Health, Poison, Strong, Beer }
        public enum amuletType { Health, Defense, Speed }
     
        [Header("Main Settings")]
        public itemTypes ItemTypes;
        [HideInInspector] public GameObject Model;
        [HideInInspector] public Texture2D Icon;
        [HideInInspector] public string itemName;
        [HideInInspector] public int itemNum;
     
        // Weapon
        [HideInInspector] public float damage;
        [HideInInspector] public float atackSpeed;
        [HideInInspector] public int broken;
     
        // Potion
        [HideInInspector] public potionType Potion = potionType.Health;
        [HideInInspector] public float healthOfset;
        [HideInInspector] public bool processingEffect;
     
        // Amulet
        [HideInInspector] public amuletType Amulet = amuletType.Health; 
        [HideInInspector] public float amuletValue;
     }
     

   • 创建ItemsEditor.cs，仅包含编辑器逻辑，并且将该脚本放在名为Editor的文件夹中（Unity会自动识别该文件夹下的脚本仅用于编辑器，打包时不会包含）：

     using UnityEditor;
     using UnityEngine;
     
     [CustomEditor(typeof(Items))]
     public class ItemsEditor : Editor {
        public override void OnInspectorGUI() {
           base.OnInspectorGUI();
           Items items = (Items) target;
           DrawMain(items);
           EditorGUILayout.Space();
        
           switch (items.ItemTypes) {
              case Items.itemTypes.Weapon:
                 WeaponSettings();
                 break;
              case Items.itemTypes.Potion:
                 PotionSettings();
                 break;
              case Items.itemTypes.Amulet:
                 AmuletSettings();
                 break;
           }
           serializedObject.ApplyModifiedProperties();
        }
     
        void DrawMain(Items items) {
           EditorGUILayout.PropertyField(serializedObject.FindProperty("Icon"));
           EditorGUILayout.PropertyField(serializedObject.FindProperty("Model"));
           EditorGUILayout.PropertyField(serializedObject.FindProperty("itemNum"));
           EditorGUILayout.PropertyField(serializedObject.FindProperty("itemName"));
           EditorGUILayout.Space();
        }
     
        void WeaponSettings() {
           EditorGUILayout.PropertyField(serializedObject.FindProperty("damage"));
           EditorGUILayout.PropertyField(serializedObject.FindProperty("atackSpeed"));
        }
     
        void PotionSettings() {
           EditorGUILayout.PropertyField(serializedObject.FindProperty("Potion"));
           EditorGUILayout.PropertyField(serializedObject.FindProperty("healthOfset"));
           EditorGUILayout.PropertyField(serializedObject.FindProperty("processingEffect"));
        }
     
        void AmuletSettings() {
           EditorGUILayout.PropertyField(serializedObject.FindProperty("Amulet"));
           EditorGUILayout.PropertyField(serializedObject.FindProperty("amuletValue"));
        }
     }
     

2. 验证设置：确保ItemsEditor.cs位于Editor文件夹内，Unity会自动将该文件夹下的代码排除在打包流程外，同时在编辑器中正常生效。

此处理方式可让打包时运行时代码不引用编辑器命名空间，从而解决编译错误，同时保留原有的编辑器功能。

内容的提问来源于stack exchange，提问作者Raleyph