Godot 4自定义Inventory相关类脚本存在无法修复的语法错误，求助

问题描述 #

本人编程能力尚浅，使用ChatGPT生成了Godot 3脚本，在将其适配为Godot 4版本时，已修复多数不兼容问题，但自定义InventorySlot与InventorySlotContainer类的脚本仍存在无法解决的语法错误。

问题代码片段 #

extends CharacterBody3D

# Structure to represent an inventory slot
class InventorySlot:
    var background: TextureRect
    var item_icon: TextureRect

    # Constructor for InventorySlot
    func _init():
        background = TextureRect.new()
        item_icon = TextureRect.new()

# Container for inventory slots
class InventorySlotContainer(Node):
    var inventory_slots: Array[InventorySlot]

    # Constructor for InventorySlotContainer
    func _init():
        inventory_slots = []

    # Function to add an inventory slot
    func add_inventory_slot():
        var slot = InventorySlot.new()
        inventory_slots.append(slot)
        add_child(slot.background)
        add_child(slot.item_icon)

# Declare the inventory container
var inventory_container: InventorySlotContainer

@onready var inventory_slot_container = InventorySlotContainer.new()

# Declare the inventory slots
var inventory_slots: Array[InventorySlot]

报错信息 #

Line 14:Expected ":" after class declaration.
Line 14:Unexpected "(" in class body.
Line 15:Unexpected "Indent" in class body.
Line 29:Expected end of file.

错误原因与修复方案 #

核心错误点 #

• 类继承语法错误：Godot 4中自定义类继承父类的语法为class 类名: 父类，而非class 类名(父类)，这是第14行报错的直接原因。
• 缩进一致性问题：自定义类内部的成员变量和函数需保持统一缩进，否则会触发语法解析错误。

修复后的完整代码 #

extends CharacterBody3D

# Structure to represent an inventory slot
class InventorySlot:
    var background: TextureRect
    var item_icon: TextureRect

    # Constructor for InventorySlot
    func _init():
        background = TextureRect.new()
        item_icon = TextureRect.new()

# Container for inventory slots
class InventorySlotContainer: Node  # 修正继承语法
    var inventory_slots: Array[InventorySlot]

    # Constructor for InventorySlotContainer
    func _init():
        inventory_slots = []

    # Function to add an inventory slot
    func add_inventory_slot():
        var slot = InventorySlot.new()
        inventory_slots.append(slot)
        add_child(slot.background)
        add_child(slot.item_icon)

# Declare the inventory container
var inventory_container: InventorySlotContainer

@onready var inventory_slot_container = InventorySlotContainer.new()

# Declare the inventory slots
var inventory_slots: Array[InventorySlot]

额外说明 #

• 修复后需确保TextureRect节点的尺寸、位置等属性正确设置，避免后续运行时出现UI显示异常。
• 若仍有运行时错误，可检查节点添加逻辑是否符合Godot 4的节点树管理规则。

内容的提问来源于stack exchange，提问作者UbuntuDude10012000