python - 访问另一个 tkinter 类的输入字段值

Question

我刚刚开始学习 tkinter 并遇到了一个问题。我有两个 tkinter 类(class)。我正在一个 tkinter 类的输入字段中输入一个值，并试图在另一个类的标签中显示它。我已经尝试了很多方法，但无法做到这一点。请如果有人可以帮助我这样做。这是我的代码。

import tkinter
from tkinter import Tk, Toplevel
from tkinter import *


def main():
    main_window = Tk()
    app = first(main_window)
    main_window.mainloop()


class first:
    def __init__(self, root):
        self.root = root
        self.root.title('First window')
        self.root.geometry('1350x700+0+0')

        single_id = Label(self.root, text="Enter id", font=("Times New Roman", 14), bg='white',
                          fg='black')
        single_id.place(x=200, y=200)

        self.mystring = tkinter.StringVar(self.root)

        self.txt_id = Entry(self.root, textvariable=self.mystring, font=("Times New Roman", 14), bg='white')
        self.txt_id.place(x=300, y=200, width=280)
        btn_search = Button(self.root, command=self.second_window, font=("Times New Roman", 15, 'bold'), text='Get Id')
        btn_search.place(x=300, y=400, width=220, height=35)

    def second_window(self):
        self.root.destroy()
        main_window = Tk()
        app = second(main_window)
        main_window.mainloop()

    def return_id(self):
        return self.mystring.get()


class second:
    def __init__(self, root):
        self.root = root
        self.root.title('Second window')
        self.root.geometry('1350x700+0+0')
        id = first.return_id

        get_id = Label(self.root, text=id, font=("Times New Roman", 14), bg='white',
                       fg='black')
        get_id.place(x=200, y=350)


if __name__ == '__main__':
    main()

我这样做的方式没有显示实际值(value)。相反它给2064283946496return_id任何帮助将不胜感激。

Answer 1

您可以做的是将第一个类对象作为参数传递给第二个类初始化器，然后在其上调用该方法。这样的事情似乎有效 -:

import tkinter
from tkinter import Tk, Toplevel
from tkinter import *


def main():
    main_window = Tk()
    app = first(main_window)
    main_window.mainloop()


class first:
    def __init__(self, root):
        self.root = root
        self.root.title('First window')
        self.root.geometry('1350x700+0+0')

        single_id = Label(self.root, text="Enter id", font=("Times New Roman", 14), bg='white',
                          fg='black')
        single_id.place(x=200, y=200)

        self.mystring = tkinter.StringVar(self.root)

        self.txt_id = Entry(self.root, textvariable=self.mystring, font=("Times New Roman", 14), bg='white')
        self.txt_id.place(x=300, y=200, width=280)
        btn_search = Button(self.root, command=self.second_window, font=("Times New Roman", 15, 'bold'), text='Get Id')
        btn_search.place(x=300, y=400, width=220, height=35)

    def second_window(self):
        self.root.destroy()
        main_window = Tk()
        app = second(main_window, self)
        main_window.mainloop()

    def return_id(self):
        return self.mystring.get()


class second:
    def __init__(self, root, first):
        self.root = root
        self.root.title('Second window')
        self.root.geometry('1350x700+0+0')
        id = first.return_id()

        get_id = Label(self.root, text=id, font=("Times New Roman", 14), bg='white',
                       fg='black')
        get_id.place(x=200, y=350)


if __name__ == '__main__':
    main()