这个方法的巧妙之处在于创建了一个控制类controller，第一是将不同的界面作为controller的属性(self.page1, self.page2 …)，第二用于接收每个界面发出的信号，从而在更高的层面对页面变化进行统筹调动。在希望实现跳转界面的按钮上添加可以发射信号的函数(pyqtSignal.emit)，并且在controller类中定义接收函数5(pyqtSignal.connect)，在函数中创建新的界面，用close()和show()来控制页面的跳转的顺序。

import sys
from PyQt5 import QtCore, QtWidgetsclass MainWindow(QtWidgets.QWidget):switch_window = QtCore.pyqtSignal(str)def __init__(self):QtWidgets.QWidget.__init__(self)self.setWindowTitle('Main Window')layout = QtWidgets.QGridLayout()self.line_edit = QtWidgets.QLineEdit()layout.addWidget(self.line_edit)self.button = QtWidgets.QPushButton('Switch Window')self.button.clicked.connect(self.switch)layout.addWidget(self.button)self.setLayout(layout)def switch(self):self.switch_window.emit(self.line_edit.text())class WindowTwo(QtWidgets.QWidget):def __init__(self, text):QtWidgets.QWidget.__init__(self)self.setWindowTitle('Window Two')layout = QtWidgets.QGridLayout()self.label = QtWidgets.QLabel(text)layout.addWidget(self.label)self.button = QtWidgets.QPushButton('Close')self.button.clicked.connect(self.close)layout.addWidget(self.button)self.setLayout(layout)class Login(QtWidgets.QWidget):switch_window = QtCore.pyqtSignal()def __init__(self):QtWidgets.QWidget.__init__(self)self.setWindowTitle('Login')layout = QtWidgets.QGridLayout()self.button = QtWidgets.QPushButton('Login')self.button.clicked.connect(self.login)layout.addWidget(self.button)self.setLayout(layout)def login(self):self.switch_window.emit()class Controller:def __init__(self):passdef show_login(self):self.login = Login()self.login.switch_window.connect(self.show_main)self.login.show()def show_main(self):self.window = MainWindow()self.window.switch_window.connect(self.show_window_two)self.login.close()self.window.show()def show_window_two(self, text):self.window_two = WindowTwo(text)self.window.close()self.window_two.show()def main():app = QtWidgets.QApplication(sys.argv)controller = Controller()controller.show_login()sys.exit(app.exec_())if __name__ == '__main__':main()