PyQt5实现界面跳转

网上关于PyQt5的教程很少，特别是界面跳转这一块儿，自己研究了半天，下来和大家分享一下

一、首先是主界面

 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_())

二、跳转界面Demo1

 # -*- 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()

三、跳转界面Demo2

 # -*- 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_())