使用 Tkinter 等待一定时间 [英] Waiting certain amount of time with Tkinter

问题描述

我有一个 Tkinter 程序，我想暂停 3 秒钟.time.sleep 不起作用，并且 after 方法不能完全按照我的意愿去做.

I have a Tkinter program which I want to pause for 3 seconds. time.sleep doesn't work and the after method doesn't do exactly what I want to.

这是一个示例代码:

from Tkinter import *
def waithere():
    print "waiting..."
root = Tk()

print "1"
root.after(3000,waithere)
print "2"

root.mainloop()

输出:

1
2
*3 seconds*
waiting...

我想要的输出:

1
waiting...
*3 seconds*
2

谢谢.

推荐答案

通常，让 GUI 等待某些事情是一个非常糟糕的主意.这并不意味着基于事件的程序如何工作.或者更准确地说，GUI 已经处于永久等待状态，您不想用自己的等待来阻止它.

Normally it's a very bad idea to have a GUI wait for something. That's imply not how event-based programs work. Or more accurately, GUIs are already in a perpetual wait state, and you don't want to block that with your own waiting.

话虽如此，tkinter 有一种方法可以等到某些事情发生.例如，您可以使用等待"功能之一，例如 wait_variable、wait_window 或 wait_visibility.

That being said, tkinter has a way to wait until certain things happen. For example, you can use one of the "wait" functions, such as wait_variable, wait_window, or wait_visibility.

假设您希望 waithere 进行等待，您可以使用 wait_variable 进行等待，after 在给定的时间后设置变量.

Assuming that you wanted waithere to do the waiting, you could use wait_variable to do the waiting, and after to set the variable after a given amount of time.

这是基于您的原始代码的解决方案:

Here's the solution based on your original code:

from Tkinter import *
def waithere():
    var = IntVar()
    root.after(3000, var.set, 1)
    print("waiting...")
    root.wait_variable(var)

root = Tk()

print "1"
waithere()
print "2"

root.mainloop()

使用这些方法的优点是您的代码在等待时仍然能够响应事件.

The advantage to using these methods is that your code is still able to respond to events while it is waiting.

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