每次切换框架时如何在 tkinter 中重新加载框架？

Question

我在我的 tkinter 桌面应用程序中使用类似于波纹管代码的东西在 windows 之间导航。然而，下面方法的问题是，由于所有的帧都是一次加载的，即使当我切换 windows 时，它仍然是 returns 上一页。但是在我的用例中，我正在从数据库（选择列表值）加载元数据，所以我想在切换 windows 时重新加载每个帧？我该如何修改这段代码，使每次切换到不同的框架时，它都会重新加载框架。

import tkinter as tk


LARGE_FONT= ("Verdana", 12)


class SeaofBTCapp(tk.Tk):

    def __init__(self, *args, **kwargs):
        
        tk.Tk.__init__(self, *args, **kwargs)
        container = tk.Frame(self)

        container.pack(side="top", fill="both", expand = True)

        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}

        for F in (StartPage, PageOne, PageTwo):

            frame = F(container, self)

            self.frames[F] = frame

            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame(StartPage)

    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()

        
class StartPage(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self,parent)
        label = tk.Label(self, text="Start Page", font=LARGE_FONT)
        label.pack(pady=10,padx=10)

        button = tk.Button(self, text="Visit Page 1",
                            command=lambda: controller.show_frame(PageOne))
        button.pack()

        button2 = tk.Button(self, text="Visit Page 2",
                            command=lambda: controller.show_frame(PageTwo))
        button2.pack()


class PageOne(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = tk.Label(self, text="Page One!!!", font=LARGE_FONT)
        label.pack(pady=10,padx=10)

        button1 = tk.Button(self, text="Back to Home",
                            command=lambda: controller.show_frame(StartPage))
        button1.pack()

        button2 = tk.Button(self, text="Page Two",
                            command=lambda: controller.show_frame(PageTwo))
        button2.pack()


class PageTwo(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = tk.Label(self, text="Page Two!!!", font=LARGE_FONT)
        label.pack(pady=10,padx=10)

        button1 = tk.Button(self, text="Back to Home",
                            command=lambda: controller.show_frame(StartPage))
        button1.pack()

        button2 = tk.Button(self, text="Page One",
                            command=lambda: controller.show_frame(PageOne))
        button2.pack()
        


app = SeaofBTCapp()
app.mainloop()

Answer 1

如果您想在每个页面显示时重新创建它，您可以在 show_frame 方法中完全控制它。

class SeaofBTCapp(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self, *args, **kwargs)
        self.container = tk.Frame(self)
        self.container.pack(fill="both", expand=True)
        self.current_frame = None
        self.show_frame(StartPage)

    def show_frame(self, new_frame_class):
        if self.current_frame:
            self.current_frame.destroy()

        self.current_frame = new_frame_class(self.container, controller=self)
        self.current_frame.pack(fill="both", expand=True)

每次切换框架时如何在 tkinter 中重新加载框架？

How to reload the frame in tkinter everytime switching the frame?

python

python-3.x

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refresh