Godot 4：代码生成单选按钮数组并修复信号关联异常问题

你遇到的问题是变量作用域导致的引用覆盖：在循环创建按钮时，button变量未用var声明，属于函数内的全局变量，每次循环都会覆盖它的引用。当信号触发时，_on_button_pressed里的button指向的是最后一次循环创建的按钮，所以无论点击哪个按钮，都会打印最后一个的编号。

有两种简单的修复方式：

方法1：绑定按钮实例到信号回调 #

修改信号连接逻辑，把当前按钮实例作为参数绑定到回调函数，确保每次触发时能直接拿到对应的按钮：

signal button_pressed

func create_radio_button_matrix():
    var row_count = len(Global.players) - 1
    var index = Global.players.find(Global.active_player)
    var players = Global.players.duplicate()
    players.pop_at(index)
    for player in players:
        for row in row_count:
            var group = ButtonGroup.new()  # 加var声明局部变量，避免全局污染
            for col in 4:
                var button = Button.new()  # 关键：用var声明局部变量，防止引用覆盖
                gray_foreground.add_child(button)
                button.set_button_group(group)
                button.position = Vector2(200 + 100 * col, 150 + 35 * row)
                button.size = Vector2(95, 20)
                button.toggle_mode = true
                button.action_mode = BaseButton.ACTION_MODE_BUTTON_PRESS
                button.text = str(row * 4 + col)
                # 将当前按钮绑定到回调函数
                button.pressed.connect(_on_button_pressed.bind(button))
                if col == 1:
                    button.set_pressed_no_signal(true)


func _on_button_pressed(pressed_button):
    print("Button " + pressed_button.text + " was pressed.")

方法2：在回调中获取信号发射源 #

如果不想绑定参数，可以在回调函数里直接获取触发信号的按钮节点（注意Godot版本差异）：

signal button_pressed

func create_radio_button_matrix():
    var row_count = len(Global.players) - 1
    var index = Global.players.find(Global.active_player)
    var players = Global.players.duplicate()
    players.pop_at(index)
    for player in players:
        for row in row_count:
            var group = ButtonGroup.new()
            for col in 4:
                var button = Button.new()
                gray_foreground.add_child(button)
                button.set_button_group(group)
                button.position = Vector2(200 + 100 * col, 150 + 35 * row)
                button.size = Vector2(95, 20)
                button.toggle_mode = true
                button.action_mode = BaseButton.ACTION_MODE_BUTTON_PRESS
                button.text = str(row * 4 + col)
                button.pressed.connect(_on_button_pressed)
                if col == 1:
                    button.set_pressed_no_signal(true)


func _on_button_pressed():
    # Godot 3.x 使用该行
    var pressed_button = get_signal_emitter()
    # Godot 4.x 替换为：var pressed_button = get_emitter()
    print("Button " + pressed_button.text + " was pressed.")

循环中的group变量也必须用var声明，否则会变成全局变量，导致所有按钮被分配到最后一个按钮组，破坏单选按钮的分组功能。

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