参加C和汇编课程后，我决定学习python。这是我的第一次尝试，请原谅任何滥用符号的行为。 以下是我为控制生长周期而创建的GUI部分。我在使用IntVar时遇到了问题。我已经创建了一个循环结束的倒计时（参见倒计时方法）。我尝试在Countdown中包含self.remaining标签，它确实显示倒计时，但显示倒计时的标签不会在周期结束时使用取消按钮和time_state标签销毁。将self.remaining标签放在使用IntVar的 init 中时，它会以天，小时，分钟，秒显示初始倒计时，但会保留该初始值，并且不会随着倒计时的重复而更新。不应该以这种方式使用IntVar更新self.remaining标签中的day_val，hour_val，min_val和sec_val吗？
from tkinter import *
import time
class Grow_Cycle():
def __init__(self):
self.time_state = Label(app, text = ("You have selected:\n "+str(day_val)+" days,\n "+str(hour_val)+" hours,\n "+str(min_val)+" minutes"))
self.time_state.grid(column = 1, row =1)
self.bttn_3 = Button(app, text = "Cancel", command = self.cancel)
self.bttn_3.configure(bg = "red")
self.bttn_3.grid(row = 2, column = 0,
ipadx = 50, ipady = 20,
padx = 20, pady = 100)
self.temp1 = (day_val * 86400)+(hour_val * 3600)+(min_val * 60)
self.countdown()
self.remaining = Label(app, text = ("You have remaining:\n"+str(day_lef.get())+" days,\n"
+str(hour_lef.get())+" hours,\n"
+str(min_lef.get())+" minutes,\n"
+str(sec_lef.get())+" seconds"),
textvariable = (day_lef, hour_lef, min_lef, sec_lef))
self.remaining.grid(column = 1, row = 2)
def cancel(self):
self.remaining.destroy()
self.bttn_3.destroy()
self.time_state.destroy()
self.temp1 = 0
def countdown(self):
if self.temp1 > 0:
self.temp1 -= 1
global day_lef
day_lef = IntVar()
day_lef.set(int(self.temp1 / 86400))
day_rem = self.temp1 % 86400
global hour_lef
hour_lef = IntVar()
hour_lef.set(int(day_rem / 3600))
hour_rem = day_rem % 3600
global min_lef
min_lef = IntVar()
min_lef.set(int(hour_rem / 60))
min_rem = hour_rem % 60
global sec_lef
sec_lef = IntVar()
sec_lef.set(int(min_rem % 60))
clock.after(1000, self.countdown)
else:
self.cancel()
def tick():
global time1
time2 = time.strftime('%H:%M:%S\n\n%m-%d-%Y')
if time2 != time1:
time1 = time2
clock.config(text=time2)
clock.after(200, tick)
def grow():
# Grow Time set window
set_grow_time = Toplevel(app)
set_grow_time.title("Enter Cycle Time")
set_grow_time.geometry("240x400")
# Set Day
set_day_grow = Spinbox(set_grow_time, from_ = 0, to_ = 10)
set_day_grow.grid(column = 0, row =0,
padx = 20, pady = 20)
set_day_grow.config(width = 10)
set_day_lbl = Label(set_grow_time, text = "Set Day: 0 to 10")
set_day_lbl.grid(column = 1, row = 0)
# Set Hour
set_hour_grow = Spinbox(set_grow_time, from_ = 0, to_ = 23)
set_hour_grow.grid(column = 0, row = 1,
padx = 20, pady = 20)
set_hour_grow.config(width = 10)
set_hour_lbl = Label(set_grow_time, text = "Set Hour: 0 to 23")
set_hour_lbl.grid(column = 1, row = 1)
# Set Minute
set_min_grow = Spinbox(set_grow_time, from_ = 0, to_ = 59)
set_min_grow.grid(column = 0, row = 2,
padx = 20, pady = 20)
set_min_grow.config(width = 10)
set_hour_lbl = Label(set_grow_time, text = "Set Minute: 0 to 59")
set_hour_lbl.grid(column = 1, row = 2)
# Confirm Selection
def fetch_time():
global day_val
day_val = int(set_day_grow.get())
global hour_val
hour_val = int(set_hour_grow.get())
global min_val
min_val = int(set_min_grow.get())
Grow_Cycle()
confirm_grow_time = Button(set_grow_time, text = "OK", command = lambda: (fetch_time(), set_grow_time.destroy()))
confirm_grow_time.grid(column = 0, row = 3)
cancel_grow_time = Button(set_grow_time, text = "Cancel", command = set_grow_time.destroy)
cancel_grow_time.grid(column = 1, row = 3)
def clean():
pass # will finish later
def cancel():
pass # will finish later
# main
# Main Loop Begin
root = Tk()
root.title("Grower")
root.geometry("1280x720")
app = Frame(root)
app.grid()
time1 = ''
clock = Label(app)
clock.config(font = ("Impact", 20))
clock.grid(column = 1, row = 0,
ipadx = 20, ipady = 20,
padx = 50, pady =50)
# Button Setup
bttn_1 = Button(app, text = "Grow", command = grow)
bttn_1.configure(bg = "light green")
bttn_1.grid(column = 0, row = 0,
ipadx = 50, ipady = 20,
padx = 20, pady = 100)
bttn_2 = Button(app, text = "Clean", command = clean)
bttn_2.configure(bg = "cyan")
bttn_2.grid(row = 1, column = 0,
ipadx = 50, ipady = 20,
padx = 20, pady = 100)
tick()
root.mainloop()
答案 0 :(得分：0)
在审核完代码后，我对您的字符串格式以及如何将字符串应用于标签进行了一些更改。
你的类def不适合我，所以我用一个标准方法重写它，用来创建一个tkinter类。
我认为您不能同时拥有text = "string'和textvariable = StringVar()。所以我已经将数据格式化为你的字符串var。
你设置它的方式不会因为某些原因而起作用。你不能在textvariable中使用多个IntVar（），所以你需要先将它们组合成一个字符串变量，然后用它作为标签的更新方法。
我已更改了字符串连接，删除了+方法并使用format()代替，因为这是目前正确的方法。
我还在self.string_var.set方法中添加了countdown()，因此我们可以通过倒计时更新此内容。
请查看此代码，如果您有任何疑问，请与我们联系。
import tkinter as tk
class Grow_Cycle(tk.Frame):
def __init__(self, master, *args, **kwargs):
tk.Frame.__init__(self, master, *args, **kwargs)
self.master = master
self.day_val = 1
self.hour_val = 0
self.min_val = 0
self.day_lef = tk.IntVar()
self.day_lef.set(1)
self.hour_lef = tk.IntVar()
self.hour_lef.set(0)
self.min_lef = tk.IntVar()
self.min_lef.set(0)
self.sec_lef = tk.IntVar()
self.sec_lef.set(0)
self.day_rem = 0
self.hour_rem = 0
self.min_rem = 0
self.string_var = tk.StringVar()
self.string_var2 = tk.StringVar()
self.string_var.set(
"You have remaining:\n{} days,\n{} hours,\n{} minutes,\n{} seconds".format(self.day_lef.get(), self.hour_lef.get(), self.min_lef.get(), self.sec_lef.get()))
self.time_state = tk.Label(self.master, text = (
"You have selected:\n {} days,\n {} hours,\n {} minutes").format(self.day_val, self.hour_val, self.min_val))
self.time_state.grid(row = 1, column = 1)
self.bttn_3 = tk.Button(self.master, bg = "red", text = "Cancel", command = self.cancel)
self.bttn_3.grid(row = 2, column = 0, ipadx = 50, ipady = 20, padx = 20, pady = 100)
self.temp1 = (self.day_val * 86400)+(self.hour_val * 3600)+(self.min_val * 60)
self.remaining = tk.Label(self.master, textvariable = self.string_var)
self.remaining.grid(column = 1, row = 2)
self.countdown()
def cancel(self):
self.remaining.destroy()
self.bttn_3.destroy()
self.time_state.destroy()
self.temp1 = 0
def countdown(self):
self.string_var.set(
"You have remaining:\n{} days,\n{} hours,\n{} minutes,\n{} seconds".format(self.day_lef.get(), self.hour_lef.get(), self.min_lef.get(), self.sec_lef.get()))
if self.temp1 > 0:
self.temp1 -= 1
self.day_lef.set(int(self.temp1 / 86400))
self.day_rem = self.temp1 % 86400
self.hour_lef.set(int(self.day_rem / 3600))
self.hour_rem = self.day_rem % 3600
self.min_lef.set(int(self.hour_rem / 60))
self.min_rem = self.hour_rem % 60
self.sec_lef.set(int(self.min_rem % 60))
root.after(1000, self.countdown)
else:
self.cancel()
if __name__ == "__main__":
root = tk.Tk()
Grow_Cycle(root)
root.mainloop()