一.使用qt creator 设置登录界面

主界面为之前设计的界面 from123.py
文章地址：三.listview或tableviw显示

二.导出ui文件为py文件

# from123.py 为导出 py文件   form.ui 为 qt creator创造的 ui 文件
pyuic5 -o x:\xxx\Fromlogin20230809.py form.ui

三.python 显示登录界面和功能

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'd:\QtcreatorProject\pythonUI\form.ui'
#
# Created by: PyQt5 UI code generator 5.15.9
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import  *
from PyQt5.QtSql import  *
from PyQt5.QtGui import  *
from PyQt5 import QtCore, QtGui, QtWidgets

from from123 import Ui_Test
from Fromlogin20230809 import Ui_login_MainWindow_2

#登录界面
class login_window(QWidget):
    def __init__(self,parent=None):
        super().__init__(parent)
        self.ui = Ui_login_MainWindow_2()
        self.ui.setupUi(self)
        # 固定大小
        self.setFixedSize(300, 150)
    
        # 设置窗口名
        self.setWindowTitle("登录")   

        self.ui.lineEdit.setText('admin')
        self.ui.lineEdit_2.setText('admin12345')
        #连接槽
        self.ui.pushButton.clicked.connect(self.login_button) 
 
    def login_button(self):
        if self.ui.lineEdit.text()=="":
            QMessageBox.warning(self, '警告', '密码不能为空，请输入！')
            return None
 
        # if  self.password == self.lineEdit.text():
        print(self.ui.lineEdit.text(),self.ui.lineEdit_2.text())
        # if (self.lineEdit.text()== self.Password) and self.lineEdit_2.text()== self.admin:
        if (self.ui.lineEdit.text()== 'admin') and self.ui.lineEdit_2.text()== 'admin12345':
            # Ui_Main = Open_Camera()  # 生成主窗口的实例
            # 1打开新窗口
            Ui_Main.show()
            # 2关闭本窗口
            self.close()
        else:
            QMessageBox.critical(self, '错误', '密码错误！')
            self.lineEdit.clear()
            return None
#主界面
class QmyMainWindow(QWidget):

    def __init__(self,parent=None):
        super().__init__(parent)

        self.ui = Ui_Test()
        self.ui.setupUi(self)
    def Update(self):
        # // 生成一个四行两列的模型
        self.TableModel = QStandardItemModel()
        # 表头
        self.TableModel.setHorizontalHeaderLabels(['a','b','c'])
        for row in range(4):
            for column in range(2):
                item = QStandardItem(str(row))
                # 设置每个位置的文本值
                self.TableModel.setItem(row, column, item)
        
        self.ui.tableView.setModel(self.TableModel)

            

    def on_listWidget_customContextMenuRequested(self,pos):  ##右键快捷菜单  策略情况
        menuList=QMenu(self)    #创建菜单
        menuList.addAction(self.ui.actionsa) 
        menuList.exec(QCursor.pos())  #显示菜单


if __name__ == "__main__":
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)#自适应分辨率
 
    app = QtWidgets.QApplication(sys.argv)
    window = login_window()
    Ui_Main = QmyMainWindow(None)# 生成主窗口的实例
    window.show()
 
    sys.exit(app.exec_())

四.结果

点击登录后显示主界面