我找到了一個倒計時代碼并對其進行了修改，使其計數到給定的數字。一切正常，但每次我按下按鈕運行這些功能時，現有標簽都會保留在那里，而新標簽會放在最上面。（如果我打包它們，它們就會被放在彼此的下面）。這是因為它們是在函式內部創建的，但我似乎找不到解決方法。
這可能是一個新手問題，但我只是想學習:)
代碼：
import time
from tkinter import *
import threading
betongtrykk = Tk()
betongtrykk.geometry("400x300")
canvas = Canvas(
betongtrykk,
bg = "#FFFFFF",
height = 300,
width = 400,
bd = 0,
highlightthickness = 0,
relief = "ridge"
)
canvas.place(x = 0, y = 0)
utnyttelseres = 65
def cd(timer_label_obj,ts):
while ts < utnyttelseres:
timer_label_obj.config(text=ts)
ts =1
timer_label_obj.place(x=100, y=150)
time.sleep(0.01)
if ts == utnyttelseres:
timer_label_obj.config(text=utnyttelseres)
def countup(t):
timer = Label(betongtrykk)
th = threading.Thread(target=cd,args=[timer,t])
th.start()
submitCountdown = Button(betongtrykk, padx=5, pady=5, text="Submit", font=("Arial", 20), command= lambda:countup(0))
submitCountdown.place(x= 100, y=100)
betongtrykk.mainloop()
uj5u.com熱心網友回復：
倒計時完成后，您可以<widget>.destroy()在標簽小部件上使用該方法。此方法將洗掉小部件并將其從螢屏上移除。
更正的代碼：
import time
from tkinter import *
import threading
betongtrykk = Tk()
betongtrykk.geometry("400x300")
canvas = Canvas(
betongtrykk,
bg = "#FFFFFF",
height = 300,
width = 400,
bd = 0,
highlightthickness = 0,
relief = "ridge"
)
canvas.place(x = 0, y = 0)
utnyttelseres = 65
def cd(timer_label_obj,ts):
while ts < utnyttelseres:
timer_label_obj.config(text=ts)
ts =1
timer_label_obj.place(x=100, y=150)
time.sleep(0.01)
if ts == utnyttelseres:
timer_label_obj.config(text=utnyttelseres)
timer_label_obj.destroy()
def countup(t):
timer = Label(betongtrykk)
th = threading.Thread(target=cd,args=[timer,t])
th.start()
submitCountdown = Button(betongtrykk, padx=5, pady=5, text="Submit", font=("Arial", 20), command = lambda:countup(0))
submitCountdown.place(x= 100, y=100)
betongtrykk.mainloop()
替代解決方案：
如果您希望在下一個倒計時開始之前洗掉倒計時標簽，您可以創建timer一個全域變數并.destroy()在創建新的倒計時標簽之前在其上使用該方法countup。
def cd(timer_label_obj,ts):
while ts < utnyttelseres:
timer_label_obj.config(text=ts)
ts =1
timer_label_obj.place(x=100, y=150)
time.sleep(0.01)
if ts == utnyttelseres:
timer_label_obj.config(text=utnyttelseres)
def countup(t):
global timer
try:
timer.destroy()
except NameError:
pass
timer = Label(betongtrykk)
th = threading.Thread(target=cd,args=[timer,t])
th.start()
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