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

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

 #

 # Created by: PyQt5 UI code generator 5.10.1

 #

 # WARNING! All changes made in this file will be lost!

 #要注意的是跳转界面第二个必须使用QDialog类，不能使用QWidget，我也不知道为什么，特别注意

 from PyQt5 import QtCore, QtGui, QtWidgets

 from PyQt5.QtWidgets import QMainWindow, QApplication

 import Dialog1

 import Dialog2

 import sys

 class Ui_Form(object):  #这是用PyQt Designer生成的代码，很简单的，拖动控件，生成ui文件，然后UIC转换成py文件

     def setupUi(self, Form):

         Form.setObjectName("Form")

         Form.resize(440, 310)

         self.form = Form

         self.btn_d1 = QtWidgets.QPushButton(Form)

         self.btn_d1.setGeometry(QtCore.QRect(60, 140, 75, 23))

         self.btn_d1.setObjectName("btn_d1")

         self.btn_d2 = QtWidgets.QPushButton(Form)

         self.btn_d2.setGeometry(QtCore.QRect(180, 140, 75, 23))

         self.btn_d2.setObjectName("btn_d2")

         self.btn_exit = QtWidgets.QPushButton(Form)

         self.btn_exit.setGeometry(QtCore.QRect(310, 140, 75, 23))

         self.btn_exit.setObjectName("btn_exit")

         self.retranslateUi(Form)

         QtCore.QMetaObject.connectSlotsByName(Form)

     def retranslateUi(self, Form):

         _translate = QtCore.QCoreApplication.translate

         Form.setWindowTitle(_translate("Form", "Form"))

         self.btn_d1.setText(_translate("Form", "Demo1"))

         self.btn_d1.clicked.connect(self.jump_to_demo1)

         self.btn_d2.setText(_translate("Form", "Demo2"))

         self.btn_d2.clicked.connect(self.jump_to_demo2)

         self.btn_exit.setText(_translate("Form", "Exit"))

         self.btn_exit.clicked.connect(self.exit)

     def jump_to_demo1(self):        #这一块注意，是重点从主界面跳转到Demo1界面，主界面隐藏，如果关闭Demo界面，主界面进程会触发self.form.show()会再次显示主界面

         self.form.hide()            #如果没有self.form.show()这一句，关闭Demo1界面后就会关闭程序

         form1 = QtWidgets.QDialog()

         ui = Dialog1.Ui_Dialog1()

         ui.setupUi(form1)

         form1.show()

         form1.exec_()

         self.form.show()

     def jump_to_demo2(self):

         self.form.hide()

         form2 = QtWidgets.QDialog()

         ui = Dialog2.Ui_Dialog2()

         ui.setupUi(form2)

         form2.show()

         form2.exec_()

         self.form.show()

     def exit(self):

         self.form.close()

 if __name__ == "__main__":

     app = QApplication(sys.argv)

     form = QtWidgets.QWidget()

     window = Ui_Form()

     window.setupUi(form)

     form.show()

     sys.exit(app.exec_())

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

 # Form implementation generated from reading ui file 'Dialog1.ui'

 #

 # Created by: PyQt5 UI code generator 5.10.1

 #

 # WARNING! All changes made in this file will be lost!

 from PyQt5 import QtCore, QtGui, QtWidgets

 class Ui_Dialog1(object):

     def setupUi(self, Dialog1):

         Dialog1.setObjectName("Dialog1")

         Dialog1.resize(400, 300)

         self.dialog=Dialog1

         self.pushButton = QtWidgets.QPushButton(Dialog1)

         self.pushButton.setGeometry(QtCore.QRect(140, 140, 75, 23))

         self.pushButton.setObjectName("pushButton")

         self.retranslateUi(Dialog1)

         QtCore.QMetaObject.connectSlotsByName(Dialog1)

     def retranslateUi(self, Dialog1):

         _translate = QtCore.QCoreApplication.translate

         Dialog1.setWindowTitle(_translate("Dialog1", "Dialog"))

         self.pushButton.setText(_translate("Dialog1", "Jump to main"))

         self.pushButton.clicked.connect(self.jump_to_main)

     def jump_to_main(self):

         self.dialog.close()

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

 # Form implementation generated from reading ui file 'Dialog2.ui'

 #

 # Created by: PyQt5 UI code generator 5.10.1

 #

 # WARNING! All changes made in this file will be lost!

 from PyQt5 import QtCore, QtGui, QtWidgets

 from PyQt5.QtWidgets import QMainWindow, QDialog, QApplication

 import sys

 class Ui_Dialog2(object):

     def setupUi(self, Dialog2):

         Dialog2.setObjectName("Dialog2")

         Dialog2.resize(400, 300)

         self.dialog = Dialog2

         self.pushButton = QtWidgets.QPushButton(Dialog2)

         self.pushButton.setGeometry(QtCore.QRect(140, 160, 75, 23))

         self.pushButton.setObjectName("pushButton")

         self.retranslateUi(Dialog2)

         QtCore.QMetaObject.connectSlotsByName(Dialog2)

     def retranslateUi(self, Dialog2):

         _translate = QtCore.QCoreApplication.translate

         Dialog2.setWindowTitle(_translate("Dialog2", "Dialog"))

         self.pushButton.setText(_translate("Dialog2", "Jump to main"))

         self.pushButton.clicked.connect(self.go_main)

     def go_main(self):

         self.dialog.close()

 if __name__ == "__main__":

     app = QApplication(sys.argv)

     form = QtWidgets.QDialog()

     ui = Ui_Dialog2()

     ui.setupUi(form)

     form.show()

     sys.exit(app.exec_())