Tkinter 多个命令和定义

Question

我正在编写密码代码。我需要一种方法将命令放入一个按钮中，以便在我单击登录按钮时它会破坏窗口并获取用户名和密码。我已经浏览了这个网站，没有任何方法对我有用，所以我需要弄清楚我需要做什么来解决这个问题。

from tkinter import *
import tkinter.messagebox as tm
class LoginFrame(Frame):
    def __init__(self, master):
        super().__init__(master)
        self.label_1 = Label(self, text="Username")
        self.label_2 = Label(self, text="Password")
        self.entry_1 = Entry(self)
        self.entry_2 = Entry(self, show="*")
        self.label_1.grid(row=0, sticky=E)
        self.label_2.grid(row=1, sticky=E)
        self.entry_1.grid(row=0, column=1)
        self.entry_2.grid(row=1, column=1)
        self.checkbox = Checkbutton(self, text="Keep me logged in")
        self.checkbox.grid(columnspan=2)
        ***def destroy(self):
            self.destroy()
    self.logbtn = Button(self, text="Login", command =  self._login_btn_clickked,)
    self.logbtn.grid(columnspan=2)
    self.pack()
def _login_btn_clickked(self):
    username = self.entry_1.get()
    password = self.entry_2.get()
    if username == "jake" and password == "hey":
        tm.showinfo("Login info", "Welcome Jake")
        master=Tk()
        def login2():
            tm.showinfo("Logging in", "Logging In...")
        b = Button(master, text="Enter GUI", command=login2)
        b.pack()
    else:
        tm.showerror("Login error", "Incorrect username")***


root = Tk()
lf = LoginFrame(root)
root.mainloop()

Answer 1

你不应该在程序中多次调用 Tk((。如果需要其他窗口，请使用 Toplevel((。

但是，在您的情况下，您也不需要它。您处于销毁帧的正确轨道上，现在您只需要启动一个新帧。我们可以把这个逻辑放到一个 Tk 类中：

import tkinter as tk
class Mainframe(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.frame = FirstFrame(self)
        self.frame.pack()
    def change(self, frame):
        self.frame.pack_forget() # delete currrent frame
        self.frame = frame(self)
        self.frame.pack() # make new frame
class FirstFrame(tk.Frame):
    def __init__(self, master=None, **kwargs):
        tk.Frame.__init__(self, master, **kwargs)
        master.title("Enter password")
        master.geometry("300x200")
        self.status = tk.Label(self, fg='red')
        self.status.pack()
        lbl = tk.Label(self, text='Enter password')
        lbl.pack()
        self.pwd = tk.Entry(self, show="*")
        self.pwd.pack()
        self.pwd.focus()
        self.pwd.bind('<Return>', self.check)
        btn = tk.Button(self, text="Done", command=self.check)
        btn.pack()
        btn = tk.Button(self, text="Cancel", command=self.quit)
        btn.pack()
    def check(self, event=None):
        if self.pwd.get() == 'password':
            self.master.change(SecondFrame)
        else:
            self.status.config(text="wrong password")
class SecondFrame(tk.Frame):
    def __init__(self, master=None, **kwargs):
        tk.Frame.__init__(self, master, **kwargs)
        master.title("Main application")
        master.geometry("600x400")
        lbl = tk.Label(self, text='You made it to the main application')
        lbl.pack()
if __name__=="__main__":
    app=Mainframe()
    app.mainloop()