Unity自定义Inspector：能否编辑InventorySlot嵌套Item类的Amount字段？

Absolutely! You can definitely create a custom Inspector for your InventorySlot MonoBehaviour to view and modify the Amount field of its Item member. Here's a straightforward, step-by-step guide with code examples tailored to your setup:

First, let’s recap your existing classes for context (adjust if your code has extra properties):

// Item.cs (regular non-MonoBehaviour class)
public class Item
{
    public int Amount;
    // Add other Item properties (like Name, ItemID, etc.) here if needed
}

// InventorySlot.cs (MonoBehaviour attached to GameObjects)
using UnityEngine;

public class InventorySlot : MonoBehaviour
{
    public Item slotItem; // Your Item member variable
}

To build the custom Inspector, you’ll need an Editor script. Critical note: This script must live inside a folder named Editor (create one in your project if it doesn’t exist) — Unity only processes editor-specific code from this folder.

Here’s the custom Editor code:

// InventorySlotEditor.cs (place this in your project's Editor folder)
using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(InventorySlot))]
public class InventorySlotEditor : Editor
{
    public override void OnInspectorGUI()
    {
        // Get a reference to the target InventorySlot component
        InventorySlot targetSlot = (InventorySlot)target;

        // Optional: Draw the default Inspector fields first (keeps the slotItem reference visible)
        base.OnInspectorGUI();

        // Add spacing and a header for the Item details
        EditorGUILayout.Space();
        EditorGUILayout.LabelField("Item Amount", EditorStyles.boldLabel);

        // Handle null case to avoid errors if no Item is assigned
        if (targetSlot.slotItem == null)
        {
            EditorGUILayout.HelpBox("No Item assigned to this slot — assign one to edit Amount!", MessageType.Info);
        }
        else
        {
            // Draw an editable int field for the Amount value
            targetSlot.slotItem.Amount = EditorGUILayout.IntField("Current Amount", targetSlot.slotItem.Amount);
        }

        // Mark the object as dirty to save changes when you exit Play Mode or save assets
        if (GUI.changed)
        {
            EditorUtility.SetDirty(targetSlot);
        }
    }
}

Quick Tips: #

• Null Safety: The check for slotItem == null prevents runtime errors when no Item is assigned to the slot.
• Default Inspector: If you don’t want to show the original slotItem reference field, remove the base.OnInspectorGUI(); line.
• Read-Only Mode: To make Amount display-only (not editable), replace the assignment line with EditorGUILayout.IntField("Current Amount", targetSlot.slotItem.Amount); (no left-hand side assignment).
• Saving Changes: EditorUtility.SetDirty(targetSlot) ensures your edits are persisted instead of being lost when you exit Play Mode.

Once you’ve set this up, select any InventorySlot GameObject in your scene or project window — you’ll see the custom Inspector with the editable Amount field (once an Item is assigned to the slot).

内容的提问来源于stack exchange，提问作者Daarwin