pyqt5利用pyqtDesigner实现登录界面

import sys
import pymysql
from loginUI import *  //导入
from PyQt5.QtWidgets import *
from PyQt5 import QtWidgets, QtCore, QtGui
from PyQt5.QtCore import *
from PyQt5.QtGui import 
class Login(QtWidgets.QDialog):
 def __init__(self):
  super(Login, self).__init__()
  self.ui = Ui_login_Ui()
  self.ui.setupUi(self)

  # self.setMinimumSize(QtCore.QSize(400, 200)) # 控制缩放范围
  # self.setMaximumSize(QtCore.QSize(400, 200))
  self.setWindowTitle("欢迎使用停车场管理系统")
  self.setFixedSize(self.width(), self.height())
  self.ui.labelTip.hide()
  self.ui.labelTip.setText("密码或用户名不能为空!")
  # 设置label字体
  labelFont = QFont()
  labelFont.setPixelSize(15)
  # 设置动态背景
  self.gif = QMovie('bg2.gif')
  self.ui.label_2.setMovie(self.gif)
  self.gif.start()
  # 这在label属性
  self.ui.labelTip.setStyleSheet(
   "QLabel{color:red;font-size:12px;font-weight:bold;font-family:Roman times;}"
         )
  self.ui.userLabel.setStyleSheet("QLabel{background:white;}"
     "QLabel{color:rgb(100,100,100,250);font-size:15px;font-weight:bold;font-family:Roman times;}"
     "QLabel:hover{color:rgb(300,300,300,120);}")
  self.ui.pwdlabel.setStyleSheet("QLabel{background:white;}"
     "QLabel{color:rgb(100,100,100,250);font-size:15px;font-weight:bold;font-family:Roman times;}"
     "QLabel:hover{color:rgb(300,300,300,120);}")
  self.ui.label.setStyleSheet("QLabel{background:white;}"
     "QLabel{color:rgb(100,100,100,250);font-size:15px;font-weight:bold;font-family:Roman times;}"
     "QLabel:hover{color:rgb(300,300,300,120);}")
 
  self.ui.loginButton.setStyleSheet("QPushButton{color:black}"
            "QPushButton:hover{color:red}"
            "QPushButton{background-color:lightblue}"
            "QPushButton{border:2px}"
            "QPushButton{border-radius:10px}"
            "QPushButton{padding:2px 4px}")
  self.ui.registerButton.setStyleSheet("QPushButton{color:black}"
            "QPushButton:hover{color:red}"
            "QPushButton{background-color:lightgreen}"
            "QPushButton{border:2px}"
            "QPushButton{border-radius:10px}"
            "QPushButton{padding:2px 4px}")
 
  palette = QPalette()
  icon = QPixmap('bg2.gif').scaled(800, 600)
  palette.setBrush(self.backgroundRole(), QBrush(icon))
  self.setPalette(palette)
  self.ui.userLabel.setFont(labelFont)
  self.ui.pwdlabel.setFont(labelFont)
  self.ui.label.setFont(labelFont)
  # 设置控件尺寸
  # self.ui.userlineEdit.setFrame(False)
  # self.ui.pwdlineEdit.setFrame(False)
  self.ui.pwdlineEdit.setEchoMode(QLineEdit.Password)# 输入框设为密码模式
  self.ui.pwdlineEdit.setClearButtonEnabled(True)
  self.ui.userlineEdit.setClearButtonEnabled(True)
  self.ui.userlineEdit.setFixedWidth(190)
  self.ui.userlineEdit.setFixedHeight(30)
  self.ui.pwdlineEdit.setFixedWidth(190)
  self.ui.pwdlineEdit.setFixedHeight(30)
  self.ui.comboBox.setFixedWidth(100)
  self.ui.comboBox.setFixedHeight(28)
  self.ui.loginButton.setFixedSize(75, 28)
  self.ui.registerButton.setFixedSize(75, 28)
  self.ui.loginButton.setShortcut('Enter') # shortcut key
  # 登陆的槽函数登陆按钮 最好写在init的析构函数中，避免链接多次产生异常
  self.ui.loginButton.clicked.connect(self.slotLogin)
  self.ui.registerButton.clicked.connect(self.slotRegister)
  self.ui.pushButton.clicked.connect(self.findPwd)

  name = self.ui.userlineEdit.text()
  pwd = self.ui.pwdlineEdit.text()
  identity = self.ui.comboBox.currentIndex()
  identity = str(identity)
  sql = "select * from administrater where username = '" + name + "' and password = '" + pwd + "' and identity= '"+ identity +"' "
  db = PyMySQLHelper()
  db.selectALL(sql)

 def keyPressEvent(self, event):
  if event.key() == QtCore.Qt.Key_Enter:
   self.slotLogin()
 def findPwd(self):
  # self.accept()
  self.u = FPwd_ui()
  self.u.show()
  # self.ui.exec()
 def slotLogin(self):
  # # 获得登录输入
  name = self.ui.userlineEdit.text()
  pwd = self.ui.pwdlineEdit.text()
  print(name)
  db = PyMySQLHelper() 
  identity = self.ui.comboBox.currentIndex() # 获取下标
  identity = str(identity)

  if name != '' and pwd != '':
   if identity == '0':

    sql = "select * from administrater where username = '" + name + "' and "                     "password = '" + pwd + "' and identity= '" + identity + "' "
    print(sql)
    # cursor.execute(sql)
    # results = cursor.fetchall()
    results = db.selectALL(sql)

    if results:
     self.ui1 = Finance()
     # self.ui1.exec()
     self.ui1.show()
     self.close()
    else:
     OK = QMessageBox.warning(self, ("警告"), ("""账号或密码错误！"""))
    # cursor.close()
    # conn.close()
   elif identity == '1':

    sql = "select * from administrater where username = '" + name + "' and "                     "password = '" + pwd + "' and identity= '" + identity + "' "
    print(sql)
    # cursor.execute(sql)
    # results = cursor.fetchall()
    results = db.selectALL(sql)
    if results:
     self.ui2 = InfoManage()
     self.ui2.show()
     self.close()
    else:
     OK = QMessageBox.warning(self, ("警告"), ("""账号或密码错误！"""))

   elif identity == '2':
    sql = "select * from administrater where username = '" + name + "' and "                     "password = '" + pwd + "' and identity= '" + identity + "' "
    print(sql)

    results = db.selectALL(sql)
    # print(identity)

    if results:
     self.uu = SeatManage()
     self.uu.exec()
     self.close()
    else:
     OK = QMessageBox.warning(self, ("警告"), ("""账号或密码错误！"""))
   elif name == 'admin' and pwd == '123' and identity == '3':
    self.a = Admin()
    self.a.show()
    self.close()



  else:
   if name == '':
    OK = QMessageBox.warning(self, ("警告"), ("""请输入账号！"""))
   if pwd == '':
    OK = QMessageBox.warning(self, ("警告"), ("""请输入密码！"""))
  # cursor.close()
  # conn.close()
 def slotRegister(self):
  self.i = reUi() # self.i的窗口命名不能重复
  self.i.exec_()


if __name__ == '__main__':
 app = QtWidgets.QApplication(sys.argv)
 my = Login()
 my.show()
 sys.exit(app.exec_())

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_login_Ui(object):
 def setupUi(self, login_Ui):
  login_Ui.setObjectName("login_Ui")
  login_Ui.resize(581, 533)
  self.gridLayoutWidget = QtWidgets.QWidget(login_Ui)
  self.gridLayoutWidget.setGeometry(QtCore.QRect(160, 330, 295, 141))
  self.gridLayoutWidget.setObjectName("gridLayoutWidget")
  self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
  self.gridLayout.setContentsMargins(0, 0, 0, 0)
  self.gridLayout.setObjectName("gridLayout")
  self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
  self.horizontalLayout_2.setObjectName("horizontalLayout_2")
  self.loginButton = QtWidgets.QPushButton(self.gridLayoutWidget)
  self.loginButton.setObjectName("loginButton")
  self.horizontalLayout_2.addWidget(self.loginButton)
  self.registerButton = QtWidgets.QPushButton(self.gridLayoutWidget)
  self.registerButton.setObjectName("registerButton")
  self.horizontalLayout_2.addWidget(self.registerButton)
  self.pushButton = QtWidgets.QPushButton(self.gridLayoutWidget)
  self.pushButton.setObjectName("pushButton")
  self.horizontalLayout_2.addWidget(self.pushButton)
  self.gridLayout.addLayout(self.horizontalLayout_2, 4, 1, 1, 1)
  self.userlineEdit = QtWidgets.QLineEdit(self.gridLayoutWidget)
  self.userlineEdit.setObjectName("userlineEdit")
  self.gridLayout.addWidget(self.userlineEdit, 0, 1, 1, 1)
  self.userLabel = QtWidgets.QLabel(self.gridLayoutWidget)
  self.userLabel.setObjectName("userLabel")
  self.gridLayout.addWidget(self.userLabel, 0, 0, 1, 1)
  self.labelTip = QtWidgets.QLabel(self.gridLayoutWidget)
  self.labelTip.setObjectName("labelTip")
  self.gridLayout.addWidget(self.labelTip, 3, 1, 1, 1)
  self.pwdlineEdit = QtWidgets.QLineEdit(self.gridLayoutWidget)
  self.pwdlineEdit.setObjectName("pwdlineEdit")
  self.gridLayout.addWidget(self.pwdlineEdit, 1, 1, 1, 1)
  self.pwdlabel = QtWidgets.QLabel(self.gridLayoutWidget)
  self.pwdlabel.setObjectName("pwdlabel")
  self.gridLayout.addWidget(self.pwdlabel, 1, 0, 1, 1)
  self.comboBox = QtWidgets.QComboBox(self.gridLayoutWidget)
  self.comboBox.setObjectName("comboBox")
  self.comboBox.addItem("")
  self.comboBox.addItem("")
  self.comboBox.addItem("")
  self.comboBox.addItem("")
  self.gridLayout.addWidget(self.comboBox, 2, 1, 1, 1)
  self.label = QtWidgets.QLabel(self.gridLayoutWidget)
  self.label.setObjectName("label")
  self.gridLayout.addWidget(self.label, 2, 0, 1, 1)
  self.label_2 = QtWidgets.QLabel(login_Ui)
  self.label_2.setGeometry(QtCore.QRect(-10, 0, 601, 321))
  self.label_2.setText("")
  self.label_2.setObjectName("label_2")

  self.retranslateUi(login_Ui)
  QtCore.QMetaObject.connectSlotsByName(login_Ui)

 def retranslateUi(self, login_Ui):
  _translate = QtCore.QCoreApplication.translate
  login_Ui.setWindowTitle(_translate("login_Ui", "Form"))
  self.loginButton.setText(_translate("login_Ui", "登 陆"))
  self.registerButton.setText(_translate("login_Ui", "注 册"))
  self.pushButton.setText(_translate("login_Ui", "找回密码"))
  self.userLabel.setText(_translate("login_Ui", " 账 户"))
  self.labelTip.setText(_translate("login_Ui", "密码或用户名错误"))
  self.pwdlabel.setText(_translate("login_Ui", " 密 码"))
  self.comboBox.setItemText(0, _translate("login_Ui", "财务管理员"))
  self.comboBox.setItemText(1, _translate("login_Ui", "信息管理员"))
  self.comboBox.setItemText(2, _translate("login_Ui", "停车场管理员"))
  self.comboBox.setItemText(3, _translate("login_Ui", "超级管理员"))
  self.label.setText(_translate("login_Ui", " 请选择"))