如何使用OOP在Tkinter中调用特定屏幕

import tkinter as tk

class App(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("My App")
        self.geometry("400x300")

class Screen(tk.Frame):
    def __init__(self, parent):
        super().__init__(parent)
        self.parent = parent
        self.create_widgets()

    def create_widgets(self):
        # 在这里创建特定屏幕的组件和布局
        label = tk.Label(self, text="特定屏幕")
        label.pack()

class App(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("My App")
        self.geometry("400x300")

        self.screen = Screen(self)
        self.screen.pack()

if __name__ == "__main__":
    app = App()
    app.mainloop()