如何进行 Tkinter 标签更新? [英] How to make a Tkinter label update?

问题描述

我有一个简单的 tkinter GUI，带有一个显示数字和按钮的标签.我将它设置为变量 x，当按下按钮时，x 的值增加 1.但是，当我按下按钮时，标签不会更新.我该怎么做?

I have a simple tkinter GUI with a label displaying a number and a button. I have it set to the variable x, and when button is pushed, the value of x goes up by one. However, when I hit the button, the label doesn't update. How do I do this?

from tkinter import *

x = 1
def add():
    global x
    x += 1

win = Tk()

label = Label(win, text=x)
label.pack()

button = Button(win, text="Increment", command=add)
button.pack()

win.mainloop() 

推荐答案

配置标签的text 是一次性的效果.稍后更新 int 不会更新标签.

Configuring the text of a label is a one shot effect. Updating the int later won't update the label.

要解决这个问题，您可以自己显式更新标签:

To solve this, you can either explicitly update the label yourself:

def add():
    global x
    x += 1
    label.configure(text=x)

...或者您可以使用 tkinter 变量，就像 IntVar(或者更一般地说，一个 StringVar，如果你的文本不仅仅是一个数字)，它会在你更新 var 时更新标签.如果您这样做，请不要忘记配置 textvariable 而不是 text.

... Or you can use a tkinter variable like an IntVar (or more generally, a StringVar, if your text isn't just a number), which does update the label when you update the var. Don't forget to configure textvariable instead of text if you do this.

from tkinter import *

win = Tk()

x = IntVar()
x.set(1)
def add():
    x.set(x.get() + 1)

label = Label(win, textvariable=x)
label.pack()

button = Button(win, text="Increment", command=add)
button.pack()

win.mainloop()

注意在创建 IntVar 之前创建 Tk() 实例 ，否则 tkinter 会抛出异常.

Take care to create a Tk() instance before you create the IntVar, otherwise tkinter will throw an exception.

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