如何在 tkinter 后台运行一个函数 [英] How to run a function in the background of tkinter

问题描述

我是 GUI 编程的新手，我想用 tkinter 编写一个 Python 程序.我想让它做的就是在后台运行一个可以通过 GUI 影响的简单函数.

I am new to GUI programming and I want to write a Python program with tkinter. All I want it to do is run a simple function in the background that can be influenced through the GUI.

该函数从 0 到无穷大计数，直到按下按钮.至少这是我想要它做的.但是我不知道如何在后台运行这个函数，因为 tkinter 的 mainloop() 一直在控制.如果我在无限循环中启动该函数，则无法执行 mainloop() 并且 GUI 已死.

The function counts from 0 to infinity until a button is pressed. At least that is what I want it to do. But I have no idea how I can run this function in the background, because the mainloop() of tkinter has control all the time. And if I start the function in an endless loop, the mainloop() cannot be executed and the GUI is dead.

我想在每个循环后将控制权返回给 mainloop()，但是如何在没有用户触发事件的情况下将控制权从 mainloop() 返回到 runapp 函数?

I would like to return control back to the mainloop() after each cycle, but how can I get the control back from the mainloop() to the runapp-function without a user-triggered event?

以下是一些杀死 GUI 的示例代码:

Here is some sample code that kills the GUI:

from Tkinter import *

class App:
    def __init__(self, master):

        frame = Frame(master)
        frame.pack()

        self.button = Button(frame, text="START", command=self.runapp)
        self.button.pack(side=LEFT)

        self.hi_there = Button(frame, text="RESTART", command=self.restart)
        self.hi_there.pack(side=LEFT)

        self.runapp()

    def restart(self):
        print "Now we are restarting..."

    def runapp(self):
        counter = 0
        while (1):
            counter =+ 1
            time.sleep(0.1)

推荐答案

你会在另一个问题中找到答案 Tkinter 在线程中加载 Icon 和 tk.mainloop 时锁定 python.

You will find the answer in this other question Tkinter locks python when Icon loaded and tk.mainloop in a thread.

简而言之，您需要有两个线程，一个用于 tkinter，一个用于后台任务.

In a nutshell, you need to have two threads, one for tkinter and one for the background task.

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