Question

我是Python的初学者，我正在尝试在tkinter中创建一个计时器。我想要一个可以停止计时器的按钮，但是似乎无法弄清楚该如何做。我曾尝试研究线程和类，但对于计时器这样的简单任务，我需要这些复杂的概念吗？

import tkinter as tk
from tkinter import *


def countdown(count):
    # change text in label
    label['text'] = count

    if count > 0:
        # call countdown again after 1000ms (1s)
        root.after(1000, countdown, count-1)


def stop():
    # THIS IS THE FUNCTION I WANT TO USE TO STOP THE TIMER, HOWEVER I DO NOT KNOW HOW, RIGHT NOT I HAVE JUST PUT exit() WHICH QUITS THE WHOLE PROGRAM
    countdown(exit())


root = tk.Tk()

root.geometry('600x600-200-0')

label = tk.Label(root)
label.place(x=35, y=15)

# call countdown first time
countdown(10)
# root.after(0, countdown, 5)

# Button, pressing it leads to greeting command
button = Button(text="OK", command=stop)
button.pack()

root.mainloop()

我只是想知道这个问题是否有一个简单的解决方案，因为当我研究所有tkinter停止计时器时都具有如此复杂的代码。预先谢谢你！

Answer 1

您只需要在某个地方存储after()函数中的工作编号即可。

job = None

def countdown(count):
    # change text in label
    label['text'] = count

    if count > 0:
        global job
        # call countdown again after 1000ms (1s)
        job = root.after(1000, countdown, count-1)


def stop():
    global job
    if job:
        root.after_cancel(job)
        job = None

我如何在功能后停止tkinter

1 个答案: