Question

我正在尝试为我的程序创建一个登录脚本。我能够编写一个基本脚本来测试我的登录框架，但我现在能够在我基本登录后访问另一个框架。

以下是我的脚本的一部分：

#!/usr/bin/python


from tkinter import *
from tkinter import ttk

import tkinter as tk
import tkinter.messagebox as tm


Large_Font = ("Verdana", 18)
Small_Font = ("Verdana", 12)


class ATM(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        tk.Tk.wm_title(self, "ATM Simulator")

        container = tk.Frame(self)
        container.pack(side = "top", fill ="both", expand =True)
        container.grid_rowconfigure(100, weight=1)
        container.grid_columnconfigure(100, weight=1)

        #Create Frame Library and use For Loop to switch between frames

        self.frames = {}

        for i in (LogIn, WelcomePage, Checking, Savings, Transfer):

            frame = i(container, self)
            self.frames[i] = frame 
            frame.grid(row= 100, column = 100, sticky= "nsew")

        self.show_frame(LogIn)

    def show_frame(self, cont):
        frame = self.frames[cont]
        frame.tkraise()

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

        global act_num_entry
        global pin_num_entry

        label = Label(self, text = "Login Using Account and PIN Numbers", font=Small_Font)
        label.pack(pady=50, padx=50)

        act_num_label = Label(self, text="Account Number")
        act_num_entry = Entry(self)

        pin_num_label = Label(self, text="PIN Number")
        pin_num_entry = Entry(self, show="*")

        act_num_label.pack(pady=5, padx=5)
        pin_num_label.pack(pady=5, padx=5)

        act_num_entry.pack(pady=5, padx=5)
        pin_num_entry.pack(pady=5, padx=5)


        logBTN = ttk.Button(self, text="Enter", 
                            command =self.log_check)
        logBTN.pack()

        quitButton = ttk.Button(self, text = "End Transaction", command = quit)
        quitButton.pack()

    def log_check(self):

        #default test pin and account numbers 

        act_num=1234567
        pin_num=1234   

        #This Try/Except handles the non-integer values being entered

        try:
            actNum = int(act_num_entry.get())
            pinNum = int(pin_num_entry.get())
        except:
            tm.showerror("Login Error", "Invalid Entry")
            pass

        if actNum == act_num and pinNum == pin_num:

            #Message Window only used to to prove my log_check function works

            tm.showinfo("ATM Login", "Login Successful")


            '''Insert script to open the WelcomePage(tk.Frame) method'''


        elif actNum != act_num:
            tm.showerror("Login Error", "Invalid Account Number")
        elif pinNum != pin_num:
            tm.showerror("Login Error", "Invalid PIN Number")
        else:
            tm.showerror("Login Error", "Invalid Entry")

class WelcomePage(tk.Frame):

    #Welcome Page Window

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        label = Label(self, text = "Welcome to the ATM Simulator", font = Large_Font)
        label.pack(pady=100, padx=100)

        checkButton = ttk.Button(self, text = "Checking Account", 
                             command = lambda: controller.show_frame(Checking))
        checkButton.pack()

        saveButton = ttk.Button(self, text = "Savings Account", 
                            command = lambda: controller.show_frame(Savings))
        saveButton.pack()

        transButton = ttk.Button(self, text = "Transfer Funds", 
                            command = lambda: controller.show_frame(Transfer))
        transButton.pack()

        quitButton = ttk.Button(self, text = "End Transaction", command = self.client_exit)
        quitButton.pack()

    def client_exit(self):
        exit()

所以我想从我的内部调用我的WelcomePage(tk.Frame)方法 if actNum == act_num and pinNum == pin_num:函数，所以我基本上可以登录我的程序。我尝试使用我的show_frame函数访问WelcomePage(tk.Frame)，但我无法访问，因为我理解该函数是ATM(tk.Tk)类的一部分，而不是LogIn(tk.Frame)。这是否有可能实现我想要的方式或者我将不得不编写另一个登录脚本来完成此任务？

Answer 1

show_frame是控制器上的一种方法。您只需要保存对控制器的引用，并从任何地方调用它。这是控制器类的全部目的 - 控制访问其他窗口。

第一步是修改类以保存对控制器的引用：

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

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

现在，您可以随时随地拨打show_frame：

if actNum == act_num and pinNum == pin_num:
    ...
    self.controller.show_frame(WelcomePage)
    ...

有关控制器的更多信息，请参阅以下答案：https://stackoverflow.com/a/32865334/7432

Answer 2

在LogIn内使用parent来访问您ATM

的self.frames[WelcomePage]

self.parent.frames[WelcomePage].some_function()

您可能需要添加LogIn.__init__行

self.parent = parent

编辑：

因为LogIn位于container内ATM你有使用

self.parent.master.show_frame(WelcomePage)

或者您可以使用

self.master.master.show_frame(WelcomePage)

然后您无需添加self.parent = parent

Python Tkinter GUI框架：如何从另一个类的函数内部调用类方法？

2 个答案: