想要做一个倒计时用窗口显示，如何让窗口的文本动态刷新呢？

Question

from tkinter import*
from datetime import datetime
a=0
someday=datetime(2022,1,15,00,00,00)
def timea(date):
    today=datetime.now()
    to=someday-today
    return to

win=Tk()
win.geometry("620x60")
win.title("倒计时")

time=Label(win,text=timea(someday),font=('华文行楷',40),fg='red',width=23,height=1 )
time.grid(row=10,column=1)

win.resizable(0,0)
win.mainloop()

这样运行只是静止的。

怎么让它能够动态刷新呢？

Answer 1

使用after()方法，另外timea()中去掉毫秒部分用 .replace(microsecond=0)

from tkinter import*
from datetime import datetime
a=0
someday=datetime(2022,1,15,00,00,00)
def timea(date):
    today=datetime.now().replace(microsecond=0) 
    to=someday-today
    return to
 
win=Tk()
win.geometry("620x60")
win.title("倒计时")
 
time=Label(win,text=timea(someday),font=('华文行楷',40),fg='red',width=23,height=1 )
time.grid(row=10,column=1)

def changetime():
    time.config(text = timea(someday) )
    win.after(1000,changetime)

win.after(1000, changetime)

win.resizable(0,0)
win.mainloop()