python - 为什么 Tkinter 应用程序在调用退出后没有关闭

Question

我正在使用 tkinter 开发一个应用程序。它由几个框架( window )叠在一起组成。我可以通过按钮从一个窗口转到另一个窗口。我根据我在 Stack Overflow 上看到的一个示例构建了它，但我不记得它的链接。

我怀疑由于我所做的选择，在调用 self.quit() 方法后 tkinter 无法正确关闭。下面的示例是我的应用程序的简化版本，尽管它与完整应用程序具有相同的结构。

通过下面的代码，您可以看到应用程序不会在整个程序结束之前关闭，即在我设置的 10 秒延迟之后。

import tkinter as tk
import tkinter.ttk as ttk
import time


class App:
    """
    Inherited from the Frame class
    """

    def __init__(self):
        self.root = tk.Tk()
        self.root.title('Test')

        # This frame will contain all windows
        container = ttk.Frame(self.root)
        container.pack(side="top", fill="both", expand=True)

        # Create different pages/windows of the application
        self.frames = {}
        self.frames["Window1"] = Window1(parent=container, controller=self)
        self.frames["Window2"] = Window2(parent=container, controller=self)
        self.frames["Window3"] = Window3(parent=container, controller=self)

        self.frames["Window1"].grid(row=0, column=0, sticky="nsew")
        self.frames["Window2"].grid(row=0, column=0, sticky="nsew")
        self.frames["Window3"].grid(row=0, column=0, sticky="nsew")

        self.show_frame("Window1")

    def run(self):
        self.root.deiconify
        self.root.mainloop()

    def show_frame(self, page_name):
        '''
        Show a frame for the given page name
        '''
        frame = self.frames[page_name]
        frame.tkraise()


class Window1(ttk.Frame):
    def __init__(self, parent, controller):
        ttk.Frame.__init__(self, parent)
        self.controller = controller
        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)

        # Go to window 2
        self.buttonW2 = ttk.Button(self, text='Go to 2', command=lambda: controller.show_frame("Window2"))
        self.buttonW2.grid(row=0, column=0, sticky='NSE')

        # Go to window 3
        self.buttonW3 = ttk.Button(self, text='Go to 3', command=lambda: controller.show_frame("Window3"))
        self.buttonW3.grid(row=0, column=1, sticky='NSE')

        # EXIT button
        self.buttonExit = ttk.Button(self, text='Exit', command=self.quit)
        self.buttonExit.grid(row=0, column=2, sticky='NSE')


class Window2(ttk.Frame):
    def __init__(self, parent, controller):
        ttk.Frame.__init__(self, parent)
        self.controller = controller
        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)
        # Go back button
        buttonBack = ttk.Button(self, text="Back to 1", command=lambda: controller.show_frame("Window1"))
        buttonBack.grid(row=0, column=3, sticky="NSE")


class Window3(ttk.Frame):
    def __init__(self, parent, controller):
        ttk.Frame.__init__(self, parent)
        self.controller = controller
        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)
        # Go back button
        buttonBack = ttk.Button(self, text="Back to 1", command=lambda: controller.show_frame("Window1"))
        buttonBack.grid(row=1, column=1, sticky="E")


if __name__ == '__main__':
    app = App()
    app.run()

    print('The App should be closed')

    time.sleep(10)

    print('The App is now closed')

有人可以帮我吗？

谢谢

Answer 1

Tkinters quit 命令只是停止 mainloop 但不会销毁窗口。如果您希望删除窗口，请使用destroy。

因此创建退出按钮，如下所示:

    self.buttonExit = ttk.Button(self, text='Exit', command=self.controller.root.destroy)
    self.buttonExit.grid(row=0, column=2, sticky='NSE')