TKINTER STOPWATCH停止以1秒的延迟

Question

当您按“重置”按钮时，秒表应该停止并重置，而是将数字设置为零，然后再添加一秒钟，并以00：00：0：0 1 结束。

与“停止”按钮相同。 FE如果我们在00:05停止停止，则停止使用00:06。加上一秒钟。但是有时您可以在当前第二秒的开始时在正确的时刻单击，以免发生。

我尝试了after_cancel，没有帮助。

在VSCODE中运行调试是不可能的，因为时间在时间​​时break点块按钮，所以我无法触发该功能。

我遵循了几个教程，每次实施它们的代码时，我都会得到这个问题。

为什么会发生？这1秒从哪里来以及如何修复？

from tkinter import *

root = Tk()

switch = False

def start():
    global switch
    switch = True

def stop():
    global switch
    switch = False


# Stopwatch variables
seconds = 0
minutes = 0
hours = 0

# Stopwatch functions

def stopwatch_update():
            global seconds, minutes, hours
            seconds += 1
            if seconds == 60:
                minutes += 1
                seconds = 0
            if minutes == 60:
                hours += 1
                minutes = 0
            
            hours_string = f'{hours}' if hours > 9 else f'0{hours}'
            minutes_string = f'{minutes}' if minutes > 9 else f'0{minutes}'
            seconds_string = f'{seconds}' if seconds > 9 else f'0{seconds}'

            stopwatch_label.config(text = hours_string + ':' + minutes_string + ':' + seconds_string)
            if switch:
                stopwatch_label.after(1000, stopwatch_update)

def stopwatch_func(command):
    if command == 'start':
        start()
        stopwatch_start.config(state='disabled')
        stopwatch_stop.config(state='normal')
        stopwatch_reset.config(state='normal')
        stopwatch_update()


    if command == 'stop':
        stopwatch_start.config(state='normal')
        stopwatch_stop.config(state='disabled')
        stop()

    if command == 'reset':
        stopwatch_start.config(state='normal')
        stopwatch_stop.config(state='disabled')
        stop()
        global hours, minutes, seconds
        hours, minutes, seconds = 0, 0, 0
        stopwatch_label.config(text='00:00:00')

                

# Stopwatch components
stopwatch_label = Label(root, font='calibri 20', text='Stopwatch')
stopwatch_label.pack()
stopwatch_start = Button(root, text='Start', command=lambda: stopwatch_func('start'))
stopwatch_start.pack()
stopwatch_stop = Button(root, text='Stop', state='disabled',command=lambda:stopwatch_func('stop'))
stopwatch_stop.pack()
stopwatch_reset = Button(root, text='Reset', state='disabled', command=lambda:stopwatch_func('reset'))
stopwatch_reset.pack()


mainloop()

Answer 1

定义了stopwatch_label.fter（1000，stopwatch_update）的变量，现在一切正常。

stopwatch_update（）的结尾：

if switch:
          global stopwatch_after
          stopwatch_after = stopwatch_label.after(1000, stopwatch_update)

stopwatch_func（命令）也已更新，以“ stop”和“ repent”命令：

if command == 'stop':
        stopwatch_start.config(state='normal')
        stopwatch_stop.config(state='disabled')
        stop()
        stopwatch_label.after_cancel(stopwatch_after)

if command == 'reset':
        stopwatch_start.config(state='normal')
        stopwatch_stop.config(state='disabled')
        stop()
        global hours, minutes, seconds
        hours, minutes, seconds = 0, 0, 0
        stopwatch_label.config(text='00:00:00')
        stopwatch_label.after_cancel(stopwatch_after)