使 python/tkinter 标签小部件更新?

问题描述

我正在努力获取一个 python/tkinter 标签小部件来更新其内容.根据今天早些时候的一个线程，我按照有关如何组合小部件的说明进行操作.然而，在运行时，标签小部件不会更改内容，而只是保留其原始内容.据我所知，decrement_widget() 从来没有被调用过.有什么想法吗?

I'm working on getting a python/tkinter label widget to update its contents. Per an earlier thread today, I followed instructions on how to put together the widgets. At runtime, however, the label widget does NOT change contents, but simply retains its original content. As far as I can tell, decrement_widget() is never called at all. Any ideas?

def snooze (secs):
  """
  Snoozes for the given number of seconds. During the snooze, a progress
  dialog is launched notifying the
  """

  root = Tkinter.Tk()
  prompt = 'hello'
  label1 = Tkinter.Label(root, text=prompt, width=len(prompt))
  label1.pack()

  remaining = secs

  def decrement_label ():
    text = "Snoozing %d sec(s)" % remaining
    remaining -= 1
    label1.config(text=text, width=100)
    label1.update_idletasks()

  for i in range(1, secs + 1):
    root.after(i * 1000, decrement_label )

  root.after((i+1) * 1000, lambda : root.destroy())
  root.mainloop()

推荐答案

您需要使用 ;当 StringVar 更改时(通过调用 myStringVar.set("text here"))，标签的文本也会更新.是的，我同意，这是一种奇怪的做事方式.

You'll want to set the label's textvariable with a StringVar; when the StringVar changes (by you calling myStringVar.set("text here")), then the label's text also gets updated. And yes, I agree, this is a strange way to do things.

请参阅 Tkinter Book 了解更多信息:

See the Tkinter Book for a little more information on this:

您可以将 Tkinter 变量与标签相关联.当变量的内容发生变化时，标签会自动更新:

v = StringVar()
Label(master, textvariable=v).pack()

v.set("New Text!")

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