from tkinter import *

import tkinter.messagebox

class LoginUi:

    def __init__(self,window):

        self.window = window

    #初始化窗口

    def initWindow(self):

        self.width = 200

        self.height = 100

        #设置窗口宽高和位子

        self.window.geometry("%dx%d+%d+%d" % (self.width, self.height,

                                              (self.window.winfo_screenwidth() - self.width)/2,

                                              (self.window.winfo_screenheight()-self.height)/2))

        #标题

        self.window.title("登录窗口")

        #标签

        self.userNameLabel = Label(self.window, text="帐号：")

        self.userNameLabel.grid(row=0, column=1, columnspan=1)

        #输入框

        self.userNameEntry = Entry(self.window, bd=5)

        self.userNameEntry.grid(row=0, column=2, columnspan=1)

        self.passwordLabel = Label(self.window, text="密码：")

        self.passwordLabel.grid(row=1, column=1, columnspan=1)

        self.passwordEntry = Entry(self.window, bd=5)

        self.passwordEntry.grid(row=1, column=2, columnspan=1)

        #按钮

        self.checkButton = Button(self.window, text="登录", command=self.checkCallBack)

        self.checkButton.grid(row=2, column=2, columnspan=1)

    def checkCallBack(self):

        if self.userNameEntry.get() == "" or self.passwordEntry.get() == "":

            tkinter.messagebox.showinfo('提示','请输入帐号或者密码！')

        if self.userNameEntry.get() == "123" and self.passwordEntry.get() == "123":

            tkinter.messagebox.showinfo('提示','密码正确！')

        else:

            tkinter.messagebox.showinfo('提示', '密码错误！')

def login():

    loginWindow = Tk() #创建窗口

    window = LoginUi(loginWindow) #类初始化

    window.initWindow() #窗口添加组件

    loginWindow.mainloop() #载入窗口循环

login()