1、qtdesign 新建一个aaa_main.ui     ui界面，同时改下ui   objectName的名字（MainWindow），在pyuic生成代码类不会重名

2、qtdesign 新建一个aaa_child.ui     ui界面，同时改下ui   objectName的名字（ChildWindow）;创建一个关闭的按钮

3、用pyuic生成的代码如下aaa_main.ui的代码如下aaa_main.py

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

# Form implementation generated from reading ui file 'aaa_main.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.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(270, 200, 93, 28))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 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", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "下一个窗口"))

4、用pyuic生成的代码如下aaa_child.ui的代码如下aaa_child.py

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

# Form implementation generated from reading ui file 'aaa_child.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.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_ChildWindow(object):
    def setupUi(self, ChildWindow):
        ChildWindow.setObjectName("ChildWindow")
        ChildWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(ChildWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(290, 200, 93, 28))
        self.pushButton.setObjectName("pushButton")
        ChildWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(ChildWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        ChildWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(ChildWindow)
        self.statusbar.setObjectName("statusbar")
        ChildWindow.setStatusBar(self.statusbar)

        self.retranslateUi(ChildWindow)
        # self.pushButton.clicked.connect(ChildWindow.close) # type: ignore
        QtCore.QMetaObject.connectSlotsByName(ChildWindow)

    def retranslateUi(self, ChildWindow):
        _translate = QtCore.QCoreApplication.translate
        ChildWindow.setWindowTitle(_translate("ChildWindow", "MainWindow"))
        self.pushButton.setText(_translate("ChildWindow", "关闭"))

5、新建一个all_main.py文件，如下

import sys
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QMainWindow
from PyQt5.QtCore import pyqtSignal
from aaa_main import Ui_MainWindow
from aaa_child import Ui_ChildWindow

class mainwinclass(QMainWindow,Ui_MainWindow):
    def __init__(self):
        super(mainwinclass,self).__init__()
        self.setupUi(self)

    def pushButtonmain_click(self):
        self.pushButton.clicked.connect(b.show) # type: ignore

class subwinclass(QMainWindow,Ui_ChildWindow):
    # show_main_win_signal = pyqtSignal()  # 该信号用于展示子窗体

    def __init__(self):
        super(subwinclass,self).__init__()
        self.setupUi(self)

    def open(self):
        self.show()


def show_sub():
    b.show()
    a.hide()
def show_main():
    a.show()
    b.hide()

if __name__ == '__main__':
    app=QtWidgets.QApplication(sys.argv)
    a=mainwinclass()
    a.show()
    b=subwinclass()
    a.pushButton.clicked.connect(show_sub)
    b.pushButton.clicked.connect(show_main)

    sys.exit(app.exec_())

6、效果显示

20240223-132230-CSDN直播