python+pyqt5实现KFC点餐收银系统

版权声明：本文为博主原创文章，转载请注明出处。https://blog.csdn.net/dcjmessi/article/details/83450737

这个kfc收银系统我实现了的以下功能：
1.正常餐品结算和找零。
2.基本套餐结算和找零。
3.使用优惠劵购买餐品结算和找零。
4.可在一定时间段参与店内活动
5.模拟打印小票的功能（写到文件中）。

工程文件：

肯德基.py文件实现各功能、kfctip.txt文件用于打印小票、picture文件里存放界面所需的图片、其他四个文件为各界面布局。
主界面：

正常餐品点餐界面：

套餐点餐界面：

活动套餐点餐界面：

当点击第二个活动套餐时：

加入订单点击返回后主界面会生成订单信息：

点击结算：



打印小票到文件：

以下是代码实现：
界面布局均使用pyqt5
主界面布局：

from PyQt5 import QtCore, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(893, 489)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(510, 20, 101, 41))
        self.pushButton_2.setObjectName("pushButton_2")
        self.pushButton_3 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_3.setGeometry(QtCore.QRect(510, 80, 101, 41))
        self.pushButton_3.setObjectName("pushButton_3")
        self.pushButton_4 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_4.setGeometry(QtCore.QRect(510, 140, 101, 41))
        self.pushButton_4.setObjectName("pushButton_4")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(510, 200, 111, 21))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(510, 230, 72, 15))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(self.centralwidget)
        self.label_3.setGeometry(QtCore.QRect(590, 230, 21, 16))
        self.label_3.setObjectName("label_3")
        self.label_4 = QtWidgets.QLabel(self.centralwidget)
        self.label_4.setGeometry(QtCore.QRect(510, 260, 81, 21))
        self.label_4.setObjectName("label_4")
        self.label_5 = QtWidgets.QLabel(self.centralwidget)
        self.label_5.setGeometry(QtCore.QRect(510, 290, 72, 15))
        self.label_5.setObjectName("label_5")
        self.label_6 = QtWidgets.QLabel(self.centralwidget)
        self.label_6.setGeometry(QtCore.QRect(590, 290, 21, 16))
        self.label_6.setObjectName("label_6")
        self.label_7 = QtWidgets.QLabel(self.centralwidget)
        self.label_7.setGeometry(QtCore.QRect(640, 20, 61, 21))
        self.label_7.setObjectName("label_7")
        self.tableWidget = QtWidgets.QTableWidget(self.centralwidget)
        self.tableWidget.setGeometry(QtCore.QRect(640, 40, 241, 231))
        self.tableWidget.setObjectName("tableWidget")
        self.tableWidget.setColumnCount(3)
        self.tableWidget.setRowCount(0)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(0, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(1, item)
        item = QtWidgets.QTableWidgetItem()
        self.tableWidget.setHorizontalHeaderItem(2, item)
        self.tableWidget.horizontalHeader().setDefaultSectionSize(70)
        self.pushButton_5 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_5.setGeometry(QtCore.QRect(640, 290, 71, 31))
        self.pushButton_5.setObjectName("pushButton_5")
        self.pushButton_6 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_6.setGeometry(QtCore.QRect(640, 350, 91, 31))
        self.pushButton_6.setObjectName("pushButton_6")
        self.pushButton_7 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_7.setGeometry(QtCore.QRect(750, 350, 91, 31))
        self.pushButton_7.setObjectName("pushButton_7")
        self.label_8 = QtWidgets.QLabel(self.centralwidget)
        self.label_8.setGeometry(QtCore.QRect(10, 10, 481, 431))
        self.label_8.setObjectName("label_8")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 893, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "肯德基"))
        self.pushButton_2.setText(_translate("MainWindow", "基本餐"))
        self.pushButton_3.setText(_translate("MainWindow", "套餐"))
        self.pushButton_4.setText(_translate("MainWindow", "活动"))
        self.label.setText(_translate("MainWindow", "会员储值卡余额"))
        self.label_2.setText(_translate("MainWindow", "钱"))
        self.label_3.setText(_translate("MainWindow", "元"))
        self.label_4.setText(_translate("MainWindow", "您的优惠券"))
        self.label_5.setText(_translate("MainWindow", "券"))
        self.label_6.setText(_translate("MainWindow", "张"))
        self.label_7.setText(_translate("MainWindow", "您的订单"))
        item = self.tableWidget.horizontalHeaderItem(0)
        item.setText(_translate("MainWindow", "名称"))
        item = self.tableWidget.horizontalHeaderItem(1)
        item.setText(_translate("MainWindow", "数量"))
        item = self.tableWidget.horizontalHeaderItem(2)
        item.setText(_translate("MainWindow", "价格/元"))
        self.pushButton_5.setText(_translate("MainWindow", "删除"))
        self.pushButton_6.setText(_translate("MainWindow", "结算"))
        self.pushButton_7.setText(_translate("MainWindow", "打印小票"))
        self.label_8.setText(_translate("MainWindow", "图"))

正常套餐界面：

from PyQt5 import QtCore, QtWidgets

class Ui_Normal(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(728, 459)
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(40, 190, 93, 41))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(Form)
        self.pushButton_2.setGeometry(QtCore.QRect(260, 190, 93, 41))
        self.pushButton_2.setObjectName("pushButton_2")
        self.pushButton_3 = QtWidgets.QPushButton(Form)
        self.pushButton_3.setGeometry(QtCore.QRect(480, 190, 93, 41))
        self.pushButton_3.setObjectName("pushButton_3")
        self.pushButton_4 = QtWidgets.QPushButton(Form)
        self.pushButton_4.setGeometry(QtCore.QRect(40, 400, 93, 41))
        self.pushButton_4.setObjectName("pushButton_4")
        self.pushButton_5 = QtWidgets.QPushButton(Form)
        self.pushButton_5.setGeometry(QtCore.QRect(620, 400, 93, 41))
        self.pushButton_5.setObjectName("pushButton_5")
        self.pushButton_6 = QtWidgets.QPushButton(Form)
        self.pushButton_6.setGeometry(QtCore.QRect(260, 400, 93, 41))
        self.pushButton_6.setObjectName("pushButton_6")
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(50, 170, 72, 15))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(Form)
        self.label_2.setGeometry(QtCore.QRect(30, 140, 121, 21))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(Form)
        self.label_3.setGeometry(QtCore.QRect(30, 10, 121, 111))
        self.label_3.setObjectName("label_3")
        self.label_4 = QtWidgets.QLabel(Form)
        self.label_4.setGeometry(QtCore.QRect(270, 170, 72, 15))
        self.label_4.setObjectName("label_4")
        self.label_5 = QtWidgets.QLabel(Form)
        self.label_5.setGeometry(QtCore.QRect(270, 140, 72, 15))
        self.label_5.setObjectName("label_5")
        self.label_6 = QtWidgets.QLabel(Form)
        self.label_6.setGeometry(QtCore.QRect(240, 10, 131, 111))
        self.label_6.setObjectName("label_6")
        self.label_7 = QtWidgets.QLabel(Form)
        self.label_7.setGeometry(QtCore.QRect(490, 170, 72, 15))
        self.label_7.setObjectName("label_7")
        self.label_8 = QtWidgets.QLabel(Form)
        self.label_8.setGeometry(QtCore.QRect(480, 140, 91, 16))
        self.label_8.setObjectName("label_8")
        self.label_9 = QtWidgets.QLabel(Form)
        self.label_9.setGeometry(QtCore.QRect(460, 10, 131, 111))
        self.label_9.setObjectName("label_9")
        self.label_10 = QtWidgets.QLabel(Form)
        self.label_10.setGeometry(QtCore.QRect(50, 380, 72, 15))
        self.label_10.setObjectName("label_10")
        self.label_11 = QtWidgets.QLabel(Form)
        self.label_11.setGeometry(QtCore.QRect(60, 360, 51, 16))
        self.label_11.setObjectName("label_11")
        self.label_12 = QtWidgets.QLabel(Form)
        self.label_12.setGeometry(QtCore.QRect(30, 250, 121, 101))
        self.label_12.setObjectName("label_12")
        self.label_13 = QtWidgets.QLabel(Form)
        self.label_13.setGeometry(QtCore.QRect(270, 380, 72, 15))
        self.label_13.setObjectName("label_13")
        self.label_14 = QtWidgets.QLabel(Form)
        self.label_14.setGeometry(QtCore.QRect(250, 360, 131, 16))
        self.label_14.setObjectName("label_14")
        self.label_15 = QtWidgets.QLabel(Form)
        self.label_15.setGeometry(QtCore.QRect(240, 250, 131, 101))
        self.label_15.setObjectName("label_15")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "加入订单"))
        self.pushButton_2.setText(_translate("Form", "加入订单"))
        self.pushButton_3.setText(_translate("Form", "加入订单"))
        self.pushButton_4.setText(_translate("Form", "加入订单"))
        self.pushButton_5.setText(_translate("Form", "返回"))
        self.pushButton_6.setText(_translate("Form", "加入订单"))
        self.label.setText(_translate("Form", "钱1"))
        self.label_2.setText(_translate("Form", "新奥尔良烤鸡腿堡"))
        self.label_3.setText(_translate("Form", "TextLabel"))
        self.label_4.setText(_translate("Form", "钱2"))
        self.label_5.setText(_translate("Form", "香辣鸡翅"))
        self.label_6.setText(_translate("Form", "TextLabel"))
        self.label_7.setText(_translate("Form", "钱3"))
        self.label_8.setText(_translate("Form", "波纹霸王薯条"))
        self.label_9.setText(_translate("Form", "TextLabel"))
        self.label_10.setText(_translate("Form", "钱4"))
        self.label_11.setText(_translate("Form", "乌龙茶"))
        self.label_12.setText(_translate("Form", "TextLabel"))
        self.label_13.setText(_translate("Form", "钱5"))
        self.label_14.setText(_translate("Form", "原味圣代（草莓酱）"))
        self.label_15.setText(_translate("Form", "TextLabel"))

套餐界面：

from PyQt5 import QtCore, QtWidgets

class Ui_Package(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(728, 393)
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(90, 280, 91, 31))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(Form)
        self.pushButton_2.setGeometry(QtCore.QRect(340, 280, 93, 31))
        self.pushButton_2.setObjectName("pushButton_2")
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(100, 250, 72, 15))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(Form)
        self.label_2.setGeometry(QtCore.QRect(350, 250, 72, 15))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(Form)
        self.label_3.setGeometry(QtCore.QRect(80, 220, 131, 21))
        self.label_3.setObjectName("label_3")
        self.label_4 = QtWidgets.QLabel(Form)
        self.label_4.setGeometry(QtCore.QRect(330, 220, 111, 21))
        self.label_4.setObjectName("label_4")
        self.label_5 = QtWidgets.QLabel(Form)
        self.label_5.setGeometry(QtCore.QRect(60, 20, 161, 171))
        self.label_5.setObjectName("label_5")
        self.label_6 = QtWidgets.QLabel(Form)
        self.label_6.setGeometry(QtCore.QRect(300, 20, 171, 171))
        self.label_6.setObjectName("label_6")
        self.pushButton_3 = QtWidgets.QPushButton(Form)
        self.pushButton_3.setGeometry(QtCore.QRect(560, 280, 101, 41))
        self.pushButton_3.setObjectName("pushButton_3")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "加入订单"))
        self.pushButton_2.setText(_translate("Form", "加入订单"))
        self.label.setText(_translate("Form", "钱1"))
        self.label_2.setText(_translate("Form", "钱2"))
        self.label_3.setText(_translate("Form", "翅桶辣堡奥堡套餐"))
        self.label_4.setText(_translate("Form", "万圣节日劲堡桶"))
        self.label_5.setText(_translate("Form", "TextLabel"))
        self.label_6.setText(_translate("Form", "TextLabel"))
        self.pushButton_3.setText(_translate("Form", "返回"))

活动界面：

from PyQt5 import QtCore, QtWidgets

class Ui_Activity(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(639, 335)
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(50, 240, 93, 31))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(Form)
        self.pushButton_2.setGeometry(QtCore.QRect(300, 240, 93, 31))
        self.pushButton_2.setObjectName("pushButton_2")
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(11, 220, 201, 20))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(Form)
        self.label_2.setGeometry(QtCore.QRect(20, 200, 161, 16))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(Form)
        self.label_3.setGeometry(QtCore.QRect(50, 180, 91, 16))
        self.label_3.setObjectName("label_3")
        self.label_4 = QtWidgets.QLabel(Form)
        self.label_4.setGeometry(QtCore.QRect(30, 30, 141, 141))
        self.label_4.setObjectName("label_4")
        self.label_5 = QtWidgets.QLabel(Form)
        self.label_5.setGeometry(QtCore.QRect(261, 220, 201, 20))
        self.label_5.setObjectName("label_5")
        self.label_6 = QtWidgets.QLabel(Form)
        self.label_6.setGeometry(QtCore.QRect(270, 200, 161, 16))
        self.label_6.setObjectName("label_6")
        self.label_7 = QtWidgets.QLabel(Form)
        self.label_7.setGeometry(QtCore.QRect(310, 180, 61, 16))
        self.label_7.setObjectName("label_7")
        self.label_8 = QtWidgets.QLabel(Form)
        self.label_8.setGeometry(QtCore.QRect(280, 30, 151, 141))
        self.label_8.setObjectName("label_8")
        self.pushButton_3 = QtWidgets.QPushButton(Form)
        self.pushButton_3.setGeometry(QtCore.QRect(490, 250, 101, 31))
        self.pushButton_3.setObjectName("pushButton_3")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "加入订单"))
        self.pushButton_2.setText(_translate("Form", "加入订单"))
        self.label.setText(_translate("Form", "钱1"))
        self.label_2.setText(_translate("Form", "2018.10.1-2018.10.31"))
        self.label_3.setText(_translate("Form", "葡式蛋挞5只"))
        self.label_4.setText(_translate("Form", "TextLabel"))
        self.label_5.setText(_translate("Form", "钱2"))
        self.label_6.setText(_translate("Form", "2018.11.1-2018.11.11"))
        self.label_7.setText(_translate("Form", "超级翅桶"))
        self.label_8.setText(_translate("Form", "TextLabel"))
        self.pushButton_3.setText(_translate("Form", "返回"))

以下为实现各界面互联和各功能的实现（注释比较详细这里就不多说了）：

# -*- coding: utf-8 -*-
# 作者：dcjmessi
# 日期：2018/10/19


from kfcmain import *
from normal import *
from package import *
from activity import *
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import QPixmap

class KFC_Main(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.main_ui = Ui_MainWindow()
        self.main_ui.setupUi(self)

        # 给按钮绑定方法
        btn_del = self.main_ui.pushButton_5
        btn_del.clicked.connect(self.order_del)
        btn_num = self.main_ui.pushButton_6
        btn_num.clicked.connect(self.order_num)
        self.btn_tip = self.main_ui.pushButton_7
        self.btn_tip.clicked.connect(self.order_tip)
        # 设置按钮为当前不可用
        self.btn_tip.setEnabled(False)
        # 定义列表
        self.num = []
        self.new_num = []

    # 主界面显示
    def person(self):
        # 主界面贴图
        self.main_ui.label_8.setPixmap(QPixmap('./picture/主界图.png'))
        # 将图片完全填充
        self.main_ui.label_8.setScaledContents(True)
        # 初始化会员储值余额
        self.balance = 200
        # 初始化优惠券数量
        self.coupons = 1
        # 显示余额和券数量
        self.main_ui.label_2.setText(str(self.balance))
        self.main_ui.label_5.setText(str(self.coupons))
        # 显示主界面
        kfcmain.show()

    # 删除tableWidget所选行
    def order_del(self):
        # 获取所选行索引
        row_index = kfcmain.main_ui.tableWidget.currentRow()
        if row_index != -1:
            # 删除
            kfcmain.main_ui.tableWidget.removeRow(row_index)

    # 结算
    def order_num(self):
        # 设置按钮为可用
        self.btn_tip.setEnabled(True)
        # 遍历所有行
        for row_index in range(kfcmain.main_ui.tableWidget.rowCount()):
            # 将每一行的第三项值添加到num列表里
            self.num.append(kfcmain.main_ui.tableWidget.item(row_index, 2).text())

        # 将num中的字符转换成int型
        self.new_num = eval('[' + (','.join(self.num)) + ']')
        # 将new_num列表值求和
        self.money = sum(self.new_num)

        # 有优惠券时
        if self.coupons >= 1:
            # 消息提示框
            button = QMessageBox.information(self, "温馨提示", "是否使用优惠券", QMessageBox.Yes | QMessageBox.No)
            # 使用优惠券
            if button == QMessageBox.Yes:
                # 当前优惠券数量减一
                self.coupons = self.coupons -1
                self.main_ui.label_5.setText(str(self.coupons))

                # 余额足够
                if self.balance >= (self.money - self.coupons * 20):
                    QMessageBox.information(self, "恭喜您", "付款成功！", QMessageBox.Yes)
                    self.balance = self.balance - self.money - self.coupons * 20
                    self.main_ui.label_2.setText(str(self.balance))
                else:
                    QMessageBox.information(self, "对不起", "您的会员储值卡余额不足！", QMessageBox.Yes)
            # 不使用优惠券
            else:
                if self.balance >= self.money:
                    QMessageBox.information(self, "恭喜您", "付款成功！", QMessageBox.Yes)
                    self.balance = self.balance - self.money
                    self.main_ui.label_2.setText(str(self.balance))
                else:
                    QMessageBox.information(self, "对不起", "您的会员储值卡余额不足！", QMessageBox.Yes)
        # 没有优惠券时
        else:
            if self.balance >= self.money:
                QMessageBox.information(self, "恭喜您", "付款成功！", QMessageBox.Yes)
                self.balance = self.balance - self.money
                self.main_ui.label_2.setText(str(self.balance))
            else:
                QMessageBox.information(self, "对不起", "您的会员储值卡余额不足！", QMessageBox.Yes)

    # 打印小票
    def order_tip(self):
        # 打开本地txt文件
        with open("kfctip.txt", "w") as f:
            # 遍历行
            for row_index in range(kfcmain.main_ui.tableWidget.rowCount()):
                # 遍历列
                for column_index in range(kfcmain.main_ui.tableWidget.columnCount()):
                    # 将tableWidget数据写入文件
                    f.write(kfcmain.main_ui.tableWidget.item(row_index, column_index).text() + "\n")
            f.write("合计：" + str(self.money) + "元")
        f.close()

class Normal(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.normal_ui = Ui_Normal()
        self.normal_ui.setupUi(self)

        # 初始化各基本餐加入订单按钮点击次数
        self.bt1 = 0
        self.bt2 = 0
        self.bt3 = 0
        self.bt4 = 0
        self.bt6 = 0
        # 初始化返回按钮点击次数
        self.bt5 = 0
        # 按钮绑定方法
        btn_hamburg = self.normal_ui.pushButton
        btn_hamburg.clicked.connect(self.order_hamburg)
        btn_chicken = self.normal_ui.pushButton_2
        btn_chicken.clicked.connect(self.order_chicken)
        btn_fries = self.normal_ui.pushButton_3
        btn_fries.clicked.connect(self.order_fries)
        btn_tea = self.normal_ui.pushButton_4
        btn_tea.clicked.connect(self.order_tea)
        btn_ice = self.normal_ui.pushButton_6
        btn_ice.clicked.connect(self.order_ice)
        btn_return = self.normal_ui.pushButton_5
        btn_return.clicked.connect(self.nor_show)

    # 显示基本餐界面
    def nor_order(self):
        self.normal_ui.label_3.setPixmap(QPixmap('./picture/新奥尔良.png'))
        self.normal_ui.label_3.setScaledContents(True)
        self.normal_ui.label_6.setPixmap(QPixmap('./picture/鸡翅.png'))
        self.normal_ui.label_6.setScaledContents(True)
        self.normal_ui.label_9.setPixmap(QPixmap('./picture/薯条.png'))
        self.normal_ui.label_9.setScaledContents(True)
        self.normal_ui.label_12.setPixmap(QPixmap('./picture/乌龙茶.png'))
        self.normal_ui.label_12.setScaledContents(True)
        self.normal_ui.label_15.setPixmap(QPixmap('./picture/冰淇淋.png'))
        self.normal_ui.label_15.setScaledContents(True)
        # 基本餐价格
        self.price_hamburg = 18.5
        self.price_chicken = 11.0
        self.price_fries = 13.0
        self.price_tea = 13.5
        self.price_ice = 10.0
        # 显示价格
        self.normal_ui.label.setText(str(self.price_hamburg)+"元/份")
        self.normal_ui.label_4.setText(str(self.price_chicken)+"元/份")
        self.normal_ui.label_7.setText(str(self.price_fries)+"元/份")
        self.normal_ui.label_10.setText(str(self.price_tea)+"元/份")
        self.normal_ui.label_13.setText(str(self.price_ice)+"元/份")
        normal.show()

    # 计算点击次数
    def order_hamburg(self):
        self.bt1 += 1

    def order_chicken(self):
        self.bt2 += 1

    def order_fries(self):
        self.bt3 += 1

    def order_tea(self):
        self.bt4 += 1

    def order_ice(self):
        self.bt6 += 1

    def nor_show(self):
        self.bt5 += 1

        # 隐藏界面
        normal.hide()

        # 获取所选各基本餐的数量对应的价格
        self.num_hamburg = self.price_hamburg * self.bt1
        self.num_chicken = self.price_chicken * self.bt2
        self.num_fries = self.price_fries * self.bt3
        self.num_tea = self.price_tea * self.bt4
        self.num_ice = self.price_ice * self.bt6

        # 不是第一次进入该界面
        if self.bt5 > 1:
            for row_index in range(kfcmain.main_ui.tableWidget.rowCount()):
                # 获取tableWidget的所有名称，并放入name列表
                name.append(kfcmain.main_ui.tableWidget.item(row_index, 0).text())
            if '新奥尔良烤鸡腿堡' in name:
                # 重新设置该行的数量和价格
                kfcmain.main_ui.tableWidget.setItem(name.index('新奥尔良烤鸡腿堡'), 1, QTableWidgetItem("×" + str(self.bt1)))
                kfcmain.main_ui.tableWidget.setItem(name.index('新奥尔良烤鸡腿堡'), 2, QTableWidgetItem(str(self.num_hamburg)))
            if '新奥尔良烤鸡腿堡' not in name:
                # 已选择
                if self.bt1 != 0:
                    # 添加一行数据
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_2.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt1)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_hamburg)))
            if '香辣鸡翅' in name:
                kfcmain.main_ui.tableWidget.setItem(name.index('香辣鸡翅'), 1, QTableWidgetItem("×" + str(self.bt2)))
                kfcmain.main_ui.tableWidget.setItem(name.index('香辣鸡翅'), 2, QTableWidgetItem(str(self.num_chicken)))
            if '香辣鸡翅' not in name:
                if self.bt2 != 0:
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_5.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt2)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_chicken)))
            if '波纹霸王薯条' in name:
                kfcmain.main_ui.tableWidget.setItem(name.index('波纹霸王薯条'), 1, QTableWidgetItem("×" + str(self.bt3)))
                kfcmain.main_ui.tableWidget.setItem(name.index('波纹霸王薯条'), 2, QTableWidgetItem(str(self.num_fries)))
            if '波纹霸王薯条' not in name:
                if self.bt3 != 0:
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_8.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt3)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_fries)))
            if '乌龙茶'in name:
                kfcmain.main_ui.tableWidget.setItem(name.index('乌龙茶'), 1, QTableWidgetItem("×" + str(self.bt4)))
                kfcmain.main_ui.tableWidget.setItem(name.index('乌龙茶'), 2, QTableWidgetItem(str(self.num_tea)))
            if '乌龙茶' not in name:
                if self.bt4 != 0:
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_11.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt4)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_tea)))
            if '原味圣代（草莓酱）' in name:
                kfcmain.main_ui.tableWidget.setItem(name.index('原味圣代（草莓酱）'), 1, QTableWidgetItem("×" + str(self.bt6)))
                kfcmain.main_ui.tableWidget.setItem(name.index('原味圣代（草莓酱）'), 2, QTableWidgetItem(str(self.num_ice)))
            if '原味圣代（草莓酱）' not in name:
                if self.bt6 != 0:
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_14.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt6)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_ice)))
        # 第一次进入该界面
        else:
            if self.bt1 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_2.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt1)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_hamburg)))
            if self.bt2 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_5.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt2)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_chicken)))
            if self.bt3 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_8.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt3)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_fries)))
            if self.bt4 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_11.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt4)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_tea)))
            if self.bt6 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(normal.normal_ui.label_14.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt6)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_ice)))

class Package(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.package_ui = Ui_Package()
        self.package_ui.setupUi(self)

        # 初始化各套餐加入订单按钮点击次数
        self.bt1 = 0
        self.bt2 = 0
        # 初始化返回按钮点击次数
        self.bt3 = 0
        # 按钮绑定方法
        btn_pack1 = self.package_ui.pushButton
        btn_pack1.clicked.connect(self.order_pack1)
        btn_pack2 = self.package_ui.pushButton_2
        btn_pack2.clicked.connect(self.order_pack2)
        btn_return = self.package_ui.pushButton_3
        btn_return.clicked.connect(self.pac_show)

    # 显示套餐界面
    def pac_order(self):
        self.package_ui.label_5.setPixmap(QPixmap('./picture/套餐2.png'))
        self.package_ui.label_5.setScaledContents(True)
        self.package_ui.label_6.setPixmap(QPixmap('./picture/套餐1.png'))
        self.package_ui.label_6.setScaledContents(True)
        # 套餐价格
        self.price_pack1 = 89.0
        self.price_pack2 = 67.0
        self.package_ui.label.setText(str(self.price_pack1)+"元/份")
        self.package_ui.label_2.setText(str(self.price_pack2)+"元/份")
        package.show()

    def order_pack1(self):
        self.bt1 += 1

    def order_pack2(self):
        self.bt2 += 1

    def pac_show(self):
        self.bt3 += 1

        package.hide()

        self.num_pack1 = self.price_pack1 * self.bt1
        self.num_pack2 = self.price_pack2 * self.bt2

        if self.bt3 > 1:
            for row_index in range(kfcmain.main_ui.tableWidget.rowCount()):
                name.append(kfcmain.main_ui.tableWidget.item(row_index, 0).text())
            if '翅桶辣堡奥堡套餐' in name:
                kfcmain.main_ui.tableWidget.setItem(name.index('翅桶辣堡奥堡套餐'), 1, QTableWidgetItem("×" + str(self.bt1)))
                kfcmain.main_ui.tableWidget.setItem(name.index('翅桶辣堡奥堡套餐'), 2, QTableWidgetItem(str(self.num_pack1)))
            if '翅桶辣堡奥堡套餐' not in name:
                if self.bt1 != 0:
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(package.package_ui.label_3.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt1)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_pack1)))
            if '万圣节日劲堡桶' in name:
                kfcmain.main_ui.tableWidget.setItem(name.index('万圣节日劲堡桶'), 1, QTableWidgetItem("×" + str(self.bt2)))
                kfcmain.main_ui.tableWidget.setItem(name.index('万圣节日劲堡桶'), 2, QTableWidgetItem(str(self.num_pack2)))
            if '万圣节日劲堡桶' not in name:
                if self.bt2 != 0:
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(package.package_ui.label_4.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt2)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_pack2)))
        else:
            if self.bt1 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(package.package_ui.label_3.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt1)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_pack1)))
            if self.bt2 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(package.package_ui.label_4.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt2)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_pack2)))

class Activity(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.activity_ui = Ui_Activity()
        self.activity_ui.setupUi(self)

        # 初始化各活动加入订单按钮点击次数
        self.bt1 = 0
        # 初始化返回按钮点击次数
        self.bt3 = 0
        # 绑定方法
        btn_act1 = self.activity_ui.pushButton
        btn_act1.clicked.connect(self.order_act1)
        btn_act2 = self.activity_ui.pushButton_2
        btn_act2.clicked.connect(self.order_act2)
        btn_return = self.activity_ui.pushButton_3
        btn_return.clicked.connect(self.act_show)

    def act_order(self):
        self.activity_ui.label_4.setPixmap(QPixmap('./picture/活动1.png'))
        self.activity_ui.label_4.setScaledContents(True)
        self.activity_ui.label_8.setPixmap(QPixmap('./picture/活动2.png'))
        self.activity_ui.label_8.setScaledContents(True)
        # 活动价格
        self.price_act1 = 29.0
        self.price_act2 = 69.0
        self.activity_ui.label.setText(str(self.price_act1) + "元/份  原价:"+str(self.price_act1 + 7) + "元/份")
        self.activity_ui.label_5.setText(str(self.price_act2) + "元/份  原价:"+str(self.price_act2 + 10) + "元/份")
        activity.show()

    def order_act1(self):
        self.bt1 += 1

    def order_act2(self):
        QMessageBox.information(self, "对不起", "活动还没有开始，敬请期待！", QMessageBox.Yes)

    def act_show(self):
        self.bt3 += 1

        activity.hide()

        self.num_act1 = self.price_act1 * self.bt1

        if self.bt3 > 1:
            for row_index in range(kfcmain.main_ui.tableWidget.rowCount()):
                name.append(kfcmain.main_ui.tableWidget.item(row_index, 0).text())
            if '葡式蛋挞5只' in name:
                kfcmain.main_ui.tableWidget.setItem(name.index('葡式蛋挞5只'), 1, QTableWidgetItem("×" + str(self.bt1)))
                kfcmain.main_ui.tableWidget.setItem(name.index('葡式蛋挞5只'), 2, QTableWidgetItem(str(self.num_act1)))
            if '葡式蛋挞5只' not in name:
                if self.bt1 != 0:
                    row_count = kfcmain.main_ui.tableWidget.rowCount()
                    kfcmain.main_ui.tableWidget.insertRow(row_count)
                    kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(activity.activity_ui.label_3.text()))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt1)))
                    kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_act1)))
        else:
            if self.bt1 != 0:
                row_count = kfcmain.main_ui.tableWidget.rowCount()
                kfcmain.main_ui.tableWidget.insertRow(row_count)
                kfcmain.main_ui.tableWidget.setItem(row_count, 0, QTableWidgetItem(activity.activity_ui.label_3.text()))
                kfcmain.main_ui.tableWidget.setItem(row_count, 1, QTableWidgetItem("×" + str(self.bt1)))
                kfcmain.main_ui.tableWidget.setItem(row_count, 2, QTableWidgetItem(str(self.num_act1)))

if __name__=="__main__":
    app = QApplication(sys.argv)

    kfcmain = KFC_Main()
    normal = Normal()
    package = Package()
    activity = Activity()
    # 显示主界面
    kfcmain.person()
    # 绑定按钮
    btn_normal = kfcmain.main_ui.pushButton_2
    btn_normal.clicked.connect(normal.nor_order)
    btn_package = kfcmain.main_ui.pushButton_3
    btn_package.clicked.connect(package.pac_order)
    btn_activity = kfcmain.main_ui.pushButton_4
    btn_activity.clicked.connect(activity.act_order)
    # 初始化name列表
    name = []

    sys.exit(app.exec_())

删除只实现了同餐品在订单上的删除，没有实现数量的减少，可自行添加。
有什么问题可留言