無法訪問其他類的變量-Tkinter

Question

我試圖在tkinter中編寫一個程序，其中用戶單擊帶有其名稱的按鈕，然后驗證頁面向他們顯示該程序。 我遇到的問題是該變量正在重置或我訪問錯誤：

import tkinter as tk
from tkinter import *
from tkinter import ttk

LARGE_FONT = ("Times New Roman", 12)
NORM_FONT = ("Times New Roman", 10)
root = Tk()
root.withdraw()


class DIS(tk.Tk):

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

        tk.Tk.__init__(self, *args, **kwargs)
        tk.Tk.iconbitmap(self, default="")
        tk.Tk.wm_title(self, "program")
        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, contactQues, nameVerify):

            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)

        button2 = ttk.Button(self, text = "Name Select",
                        command=lambda:           controller.show_frame(contactQues))
        button2.pack()


class contactQues(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)  
        self.controller = controller
        global name
        name = StringVar()

        label1 = tk.Label(self, text = "Select Your Name", font = LARGE_FONT)
        label1.pack(pady=10, padx=10)

        button2 = ttk.Button(self, text = "Bojangles", command = self.bojangles)
        button2.pack(pady=5)

    def bojangles(self):

        name.set("Mr. Bojangles")
        self.controller.show_frame(nameVerify)
    #
    #Many other names to select
    #

class nameVerify(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        namename = name.get()

        label5 = tk.Label(self, text = "Your Name:", font = LARGE_FONT)
        label5.pack(pady=10, padx=10)
        labelcontact = tk.Label(self, text = namename, font = NORM_FONT)
        labelcontact.pack()

app = DIS()
app.mainloop()

因此，從本質上講，我想執行的操作是：-程序運行並按“名稱選擇”，用戶選擇其名稱，最后一頁顯示其選擇。

我試過將全局變量，labelcontact標簽的labelcontact ，StringVar（）等弄亂，似乎無法將其固定下來。

有一個更好的方法嗎？ 還是我天生做錯了什么？

感謝您的任何幫助。

Answer 1

我建議將name作為DIS類的屬性。 然后，您的StartPage和nameVerify實例可以通過其controller屬性訪問它。 如果希望labelcontact在name自動更新，請使用textvariable屬性。

此外，您需要刪除root = Tk()和root.withdraw()行。 我不知道為什么，但是只要它們在那里，labelcontact Label就不會正確更新。 在任何情況下，它們似乎都不做任何事情-希望它們對您的實際代碼不是至關重要的。

import tkinter as tk
from tkinter import *
from tkinter import ttk

LARGE_FONT = ("Times New Roman", 12)
NORM_FONT = ("Times New Roman", 10)

class DIS(tk.Tk):

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

        tk.Tk.__init__(self, *args, **kwargs)
        tk.Tk.iconbitmap(self, default="")
        tk.Tk.wm_title(self, "program")
        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.name = StringVar()
        self.frames = {}

        for F in (StartPage, contactQues, nameVerify):

            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)

        button2 = ttk.Button(self, text = "Name Select",
                        command=lambda:           controller.show_frame(contactQues))
        button2.pack()


class contactQues(tk.Frame):

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

        label1 = tk.Label(self, text = "Select Your Name", font = LARGE_FONT)
        label1.pack(pady=10, padx=10)

        button2 = ttk.Button(self, text = "Bojangles", command = self.bojangles)
        button2.pack(pady=5)

    def bojangles(self):

        self.controller.name.set("Mr. Bojangles")
        self.controller.show_frame(nameVerify)
    #
    #Many other names to select
    #

class nameVerify(tk.Frame):

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

        label5 = tk.Label(self, text = "Your Name:", font = LARGE_FONT)
        label5.pack(pady=10, padx=10)
        labelcontact = tk.Label(self, textvariable = self.controller.name, font = NORM_FONT)
        labelcontact.pack()

app = DIS()
app.mainloop()