Godot中connect运行时错误与Callable编译错误求助

问题背景 #

我是Godot新手，为积累经验参加Game Jam，需要实现点击按钮将指定场景生成到12个预设位置中的随机空位，但按钮绑定代码用connect或Callable都报错。

错误信息 #

使用connect时的错误 #

Line 23:Invalid argument for "connect()" function: argument 2 should be "Callable" but is "res://scenes/spawn_button_1.gd".

Line 23:Cannot pass a value of type "String" as "int".

Line 23:Invalid argument for "connect()" function: argument 3 should be "int" but is "String".

使用Callable时的错误 #

Invalid call. Nonexistent function 'Callable' in base 'Button(spawn_button_1.gd)'.

原始代码 #

extends Button

#var rares = {"common" : 15,
    #"rare" : 5,
    #"worthless" : 2}
            
@export var scene_to_spawn : PackedScene

@onready var spawn_button = $".")

var spawn_positions = [
    Vector2(-65, -65), Vector2(120, -65), Vector2(65, -28),
    Vector2(-25, -65), Vector2(160, -65), Vector2(15, -28),
    Vector2(15, -65), Vector2(160, -28), Vector2(-25, -28),
    Vector2(65, -65), Vector2(120, -28), Vector2(-65, -28)
]

var occupied_positions = []

func _ready() -> void:
     spawn_button.Callable("pressed", "_on_Button_pressed")

func _on_pressed() -> void:
    your text`var available_positions = get_available_positions()
    
    if available_positions.size() > 0:
        var random_position = available_positions[randi() % available_positions.size()]
    
        var new_scene = scene_to_spawn.instantiate()
    
    new_scene.position = random_position

    add_child(new_scene)
        
    occupied_positions.append(random_position)
else:
    print("no spots!")
        
func get_available_positions() -> Array:
    var available_positions = []
    
    for position in spawn_positions:
        if !occupied_positions.has(position):
            available_positions.append(position)
        return available_positions

问题修复 #

1. 按钮绑定错误修正 #

Godot中信号绑定的正确方式：

• 脚本本身继承自Button，无需额外获取spawn_button变量，直接用pressed.connect(_on_pressed)即可，参数传入函数本身而非字符串。

修正后的_ready函数：

func _ready() -> void:
    pressed.connect(_on_pressed)

2. 语法与逻辑错误修正 #

• 删除_on_pressed函数内的无效内容your text
• 调整缩进：场景实例化后的位置设置、添加子节点、记录位置的代码必须放在if代码块内，否则无空位时会报错
• 修正get_available_positions的return位置：必须放在for循环外，否则只会检查第一个位置就返回结果

修复后完整代码 #

extends Button

#var rares = {"common" : 15,
    #"rare" : 5,
    #"worthless" : 2}
            
@export var scene_to_spawn : PackedScene

var spawn_positions = [
    Vector2(-65, -65), Vector2(120, -65), Vector2(65, -28),
    Vector2(-25, -65), Vector2(160, -65), Vector2(15, -28),
    Vector2(15, -65), Vector2(160, -28), Vector2(-25, -28),
    Vector2(65, -65), Vector2(120, -28), Vector2(-65, -28)
]

var occupied_positions = []

func _ready() -> void:
    pressed.connect(_on_pressed)

func _on_pressed() -> void:
    var available_positions = get_available_positions()
    
    if available_positions.size() > 0:
        var random_position = available_positions[randi() % available_positions.size()]
        var new_scene = scene_to_spawn.instantiate()
        new_scene.position = random_position
        add_child(new_scene)
        occupied_positions.append(random_position)
    else:
        print("no spots!")
        
func get_available_positions() -> Array:
    var available_positions = []
    
    for position in spawn_positions:
        if !occupied_positions.has(position):
            available_positions.append(position)
    return available_positions

额外提示 #

• 可通过Godot编辑器可视化绑定信号：选中Button节点，右侧"信号"面板找到pressed信号，点击连接并选择当前脚本的_on_pressed函数，无需手动写connect代码
• 如需初始化随机数，可在_ready中添加randomize()确保每次运行随机结果不同

内容的提问来源于stack exchange，提问作者Jace