Python 使用 tkinter 按钮更新用户输入 [英] Python update user input with tkinter button

问题描述

我刚开始使用 python，但遇到了问题.我尝试了各种解决方案，但无法更新显示19"的字段.当我点击加号时，我希望它是 20，然后是 21，...当我点击时 - 它必须回到 20 、19.谁能告诉我如何解决这个问题?

I'm just starting with python and i'm having a problem. I've tried various solutions, but i can't update the field that says '19'. When i click on plus, i want it to be 20, then 21,... and when i click - it has to go back to 20 , 19. Can anybody tell me how to solve this?

 from tkinter import *

    def fct_tempplus():
        while True:
            #  tekstvak_input_user = tekstvak_input_user +1
            return tekstvak_input_user + 1

    def fct_tempmin():
        print ('ok')


    window = Tk()
    window.geometry("800x400")  # not *
    window.title("TEST")

    label= Label( window, text = "Temp?")
    label.place(x=350,y=175)


    tempplus=Button(window, bd=10,width=10, height = 1,text="+",command=fct_tempplus,
font=("Helvetica", 12))
    tempplus.place(x=500,y=150)


    tempmin=Button(window, bd=10,width=10, height = 1,text="-", font=("Helvetica", 12),command=fct_tempmin)
    tempmin.place(x=500,y=200)


    tekstvak_input_user = Entry(window, width = 10 )
    tekstvak_input_user.insert(0,19.0)
    tekstvak_input_user.place(x=350 , y=200)



    window.mainloop()`

推荐答案

while True 在这个程序中是不需要的.并且您必须使用 .get() 来获取函数内的值.然后你应该将它存储在一个全局变量中，将其转换为 int 或 float.然后，只需使用 delete(0, END) 清除 Entry 小部件中的内容，然后使用 insert() 将新值插入条目.

while True is not needed in this program. And you have to use .get() to get a value inside a function. And then you should store it in a globalized variable, convert it into int or float. Then, simply use delete(0, END) to clear what's inside the Entry widget and then use insert() to insert the new value in the Entry.

像这样:

from tkinter import *

var = 0


def fct_temp_plus():
    global var
    var = float(tekstvak_input_user.get())
    var += 1
    tekstvak_input_user.delete(0, END)
    tekstvak_input_user.insert(0, var)


def fct_temp_min():
    global var
    var = float(tekstvak_input_user.get())
    var -= 1
    tekstvak_input_user.delete(0, END)
    tekstvak_input_user.insert(0, var)


window = Tk()
window.geometry("800x400")  # not *
window.title("TEST")

label = Label(window, text="Temp?")
label.place(x=350, y=175)


temp_plus = Button(window, bd=10, width=10, height=1, text="+", command=fct_temp_plus, font=("Helvetica", 12))
temp_plus.place(x=500, y=150)


temp_min = Button(window, bd=10, width=10, height=1, text="-", font=("Helvetica", 12), command=fct_temp_min)
temp_min.place(x=500, y=200)

tekstvak_input_user = Entry(window, width=10)
tekstvak_input_user.insert(0, 19.0)
tekstvak_input_user.place(x=350, y=200)

window.mainloop()

注意:你应该总是import tkinter as tk.

像这样:

import tkinter as tk

var = 0


def fct_temp_plus():
    global var
    var = float(tekstvak_input_user.get())
    var += 1
    tekstvak_input_user.delete(0, tk.END)
    tekstvak_input_user.insert(0, var)


def fct_temp_min():
    global var
    var = float(tekstvak_input_user.get())
    var -= 1
    tekstvak_input_user.delete(0, tk.END)
    tekstvak_input_user.insert(0, var)


window = tk.Tk()
window.geometry("800x400")
window.title("TEST")

label = tk.Label(window, text="Temp?")
label.place(x=350, y=175)

temp_plus = tk.Button(window, bd=10, width=10, height=1, text="+", command=fct_temp_plus, font=("Helvetica", 12))
temp_plus.place(x=500, y=150)

temp_min = tk.Button(window, bd=10, width=10, height=1, text="-", font=("Helvetica", 12), command=fct_temp_min)
temp_min.place(x=500, y=200)

tekstvak_input_user = tk.Entry(window, width=10)
tekstvak_input_user.insert(0, 19.0)
tekstvak_input_user.place(x=350, y=200)

window.mainloop()

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