如何在 Tkinter GUI 应用程序中有效地在帧之间转换？

import tkinter as tk
import tkFont as tkfont

class SampleApp(tk.Tk):

    def __init__(self, *args, **kwargs):
        # Initialize the Tkinter object
        tk.Tk.__init__(self, *args, **kwargs)

        # Create a title font
        self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")

        # Create a container to hold the frames
        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        # Initialize a dictionary to store the frames
        self.frames = {}
        for F in (StartPage, PageOne, PageTwo):
            page_name = F.__name__
            frame = F(parent=container, controller=self)
            self.frames[page_name] = frame

            # Add each frame to the container
            frame.grid(row=0, column=0, sticky="nsew")

        # Display the start page initially
        self.show_frame("StartPage")

    def show_frame(self, page_name):
        # Bring the specified frame to the top of the stacking order
        frame = self.frames[page_name]
        frame.tkraise()

class StartPage(tk.Frame):

    def __init__(self, parent, controller):
        # Initialize the Frame
        tk.Frame.__init__(self, parent)
        self.controller = controller

        # Create a label
        label = tk.Label(self, text="This is the start page", font=controller.title_font)
        label.pack(side="top", fill="x", pady=10)

        # Create buttons to navigate to other pages
        button1 = tk.Button(self, text="Go to Page One",
                            command=lambda: controller.show_frame("PageOne"))
        button2 = tk.Button(self, text="Go to Page Two",
                            command=lambda: controller.show_frame("PageTwo"))
        button1.pack()
        button2.pack()

class PageOne(tk.Frame):

    def __init__(self, parent, controller):
        # Initialize the Frame
        tk.Frame.__init__(self, parent)
        self.controller = controller

        # Create a label
        label = tk.Label(self, text="This is page 1", font=controller.title_font)
        label.pack(side="top", fill="x", pady=10)

        # Create a button to navigate to another page
        button = tk.Button(self, text="Go to the start page",
                           command=lambda: controller.show_frame("StartPage"))
        button.pack()

class PageTwo(tk.Frame):

    def __init__(self, parent, controller):
        # Initialize the Frame
        tk.Frame.__init__(self, parent)
        self.controller = controller

        # Create a label
        label = tk.Label(self, text="This is page 2", font=controller.title_font)
        label.pack(side="top", fill="x", pady=10)

        # Create a button to navigate to another page
        button = tk.Button(self, text="Go to the start page",
                           command=lambda: controller.show_frame("StartPage"))
        button.pack()

if __name__ == "__main__":
    # Create the application instance
    app = SampleApp()
    app.mainloop()