tkinter：复选框不会在 for 循环中更新 [重复]

Question

我陷入了以下问题。使用 for 循环，我想制作一些复选框，这些复选框会自动更新一个标签，说明该复选框是否被勾选。但是，它给出了错误的结果（它总是说复选框被选中，无论是否如此；值得注意的是复选框默认未选中），see here how the GUI looks like (including error)。与复选框对应的 IntVar 工作正常，当勾选至少一个复选框并按下功能是读取复选框的按钮时可以看出。另见以下代码：

import tkinter as tk

top = tk.Tk()
n_passes = 3

checkbox_var = [0] * n_passes
checkbox = [0] * n_passes

def tick_passes(i): # update label saying if checkboxes are ticked
    if checkbox_var[i].get == 0:
        label = tk.Label(top, text = f"pass #{i} not ticked")
    else:
        label = tk.Label(top, text = f"pass #{i} ticked")
    label.grid(row = 1, column = i)

def check_checkbox_var(): # check whether checkbox_var[i] is updated
    for i in range(n_passes):
        print(f"checkbox_var[i].get() = {checkbox_var[i].get()}")

for i in range(n_passes):
    checkbox_var[i] = tk.IntVar() # turn on/off certain passes
    print(f"checkbox_var[i].get() = {checkbox_var[i].get()}")
    checkbox[i] = tk.Checkbutton(top, text = f"Tick pass {i}", variable =
    checkbox_var[i], command = tick_passes(i))
    checkbox[i].grid(row = 0, column = i, sticky=tk.W)

    var_button = tk.Button(top, text = "Check checkbox_var", command =
    check_checkbox_var).grid(row = 2, column = 0) # check whether checkbox_var[i] is updated

top.mainloop()

有人可以帮我更新标签吗？如果有其他方法可以解决此问题，例如使用要按下的按钮而不是要勾选的检查按钮，这也适用于我。

Answer 1

i 始终为 2，因为在 mainloop 启动后您实际上没有运行任何循环。 以下类型的作品，但您需要更改标签的某些内容，因为现在所有标签都只是相互叠加。您应该创建一次，然后只更新文本，但我会留给您。

import tkinter as tk

top = tk.Tk()
n_passes = 3

checkbox_var = [0] * n_passes
checkbox = [0] * n_passes

def tick_passes(): # update label saying if checkboxes are ticked
    for i in range(n_passes):
        if checkbox_var[i].get() == 0:
            label = tk.Label(top, text = f"pass #{i} not ticked")
        else:
            label = tk.Label(top, text = f"pass #{i} ticked")
        label.grid(row = 1, column = i)

def check_checkbox_var(): # check whether checkbox_var[i] is updated
    for i in range(n_passes):
        print(f"checkbox_var[i].get() = {checkbox_var[i].get()}")

for i in range(n_passes):
    print(i)
    checkbox_var[i] = tk.IntVar() # turn on/off certain passes
    print(f"checkbox_var[i].get() = {checkbox_var[i].get()}")
    checkbox[i] = tk.Checkbutton(top, text = f"Tick pass {i}", variable =
    checkbox_var[i], command = tick_passes)
    checkbox[i].grid(row = 0, column = i, sticky=tk.W)

    var_button = tk.Button(top, text = "Check checkbox_var", command =
    check_checkbox_var).grid(row = 2, column = 0) # check whether checkbox_var[i] is updated

top.mainloop()