如何在 tkinter 中进行简单的倒计时? [英] How do I make a simple countdown time in tkinter?
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问题描述
我正在以分钟为单位制作一个简单的倒数计时器.我似乎无法在文本标签中显示倒计时.有人可以帮我吗?
I am making a simple countdown timer in minutes. I can't seem to display the countdown in text label. Can someone help me?
import tkinter as tk
import time
def countdown(t):
while t:
mins, secs = divmod(t, 60)
timeformat = '{:02d}:{:02d}'.format(mins, secs)
print(timeformat, end='\r')
label.config(text=timeformat)
time.sleep(1)
t -= 1
root = tk.Tk()
label = tk.Label(root,text="Time")
label.pack()
button = tk.Button(root,text = "click here", command=countdown(60)).pack()
root.mainloop()
推荐答案
首先,用这个代替
button = tk.Button(root,text = "click here", command=countdown(60)).pack()
你必须使用 lambda
来指定参数
You have to use lambda
to specify arguments
button = tk.Button(root,text = "click here", command=lambda:countdown(60)).pack()
那你每次更新标签都要更新root
Then you have to update root
each time you update the label
def countdown(t):
while t:
mins, secs = divmod(t, 60)
timeformat = '{:02d}:{:02d}'.format(mins, secs)
print(timeformat, end='\r')
label.config(text=timeformat)
root.update() #This way your program will display the numbers.
time.sleep(1)
t -= 1
另外我建议使用线程,以便在程序运行时能够使用其他按钮.
Also I recommend to use Threads, to be able to use other buttons while your program is running.
请求的代码:
import threading
import tkinter as tk
import time
import sys
runtime = 300 #In seconds, you can change this
class CountdownApp:
def __init__(self, runtime):
self.runtime = runtime
self._createApp()
self._packElements()
self._startApp()
def _createApp(self):
self.root = tk.Tk()
def _packElements(self):
self.label = tk.Label(self.root,text="Time")
self.label.pack()
self.button = tk.Button(self.root,text = "click here", command=self.startCounter)
self.button.pack()
def countdown(self):
self.t = self.runtime
self.button.config(state='disabled')
while self.t > -1:
self.mins, self.secs = divmod(self.t, 60)
self.timeformat = '{:02d}:{:02d}'.format(self.mins, self.secs)
self.label.config(text=self.timeformat)
self.root.update()
time.sleep(1)
self.t -= 1
self.label.config(text='Time')
self.root.update()
self.button.config(state='normal')
def startCounter(self):
threading.Thread(target=self.countdown).start()
def _startApp(self):
self.root.mainloop()
CountdownApp(runtime)
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