如何使用PyQt在窗口中切换布局？(不关闭/打开窗口)

Question

我目前正在尝试使用python和PyQt4(而不是Qt Designer)创建程序.我创建了一个登录类(QDialog)和一个Homepage类(QMainWindow).但是,因为我的程序将包含大量页面(通过程序导航将很大)我想知道如何在QMainWindow中切换布局,而不是不断创建新窗口并关闭旧窗口.例如,我将MainWindow('HomePage')布局设置为登录后的默认屏幕,然后在MainWindow中有一个子类,允许我导航到用户设置(或任何其他页面).而不是创建一个新窗口并关闭MainWindow,有没有办法让我将MainWindow布局交换到用户设置布局？(道歉,如果这没有意义,我对PyQt不熟悉).示例代码如下所示(V.Basic代码)

-------------------------------------------------- --------------------------------

import sys     
from PyQt4.QtGui import *      
from PyQt4.QtCore import *     

class MainWindow(QMainWindow):
    #Constructor
    def __init__(self):
        super(MainWindow, self).__init__() #call super class constructor

        button1 = QPushButton("User Settings", self)
        button1.clicked.connect(UserSelection)
        button1.resize(50,50)
        button1.move(350,50)

        self.show()

class UserSelection(?):
    ...

def main():
   app = QApplication(sys.argv) #Create new application
   Main = MainWindow()
   sys.exit(app.exec_()) #Monitor application for events

if __name__ == "__main__":
    main()

Answer 1

from PyQt4 import QtCore, QtGui

class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.central_widget = QtGui.QStackedWidget()
        self.setCentralWidget(self.central_widget)
        login_widget = LoginWidget(self)
        login_widget.button.clicked.connect(self.login)
        self.central_widget.addWidget(login_widget)
    def login(self):
        logged_in_widget = LoggedWidget(self)
        self.central_widget.addWidget(logged_in_widget)
        self.central_widget.setCurrentWidget(logged_in_widget)


class LoginWidget(QtGui.QWidget):
    def __init__(self, parent=None):
        super(LoginWidget, self).__init__(parent)
        layout = QtGui.QHBoxLayout()
        self.button = QtGui.QPushButton('Login')
        layout.addWidget(self.button)
        self.setLayout(layout)
        # you might want to do self.button.click.connect(self.parent().login) here


class LoggedWidget(QtGui.QWidget):
    def __init__(self, parent=None):
        super(LoggedWidget, self).__init__(parent)
        layout = QtGui.QHBoxLayout()
        self.label = QtGui.QLabel('logged in!')
        layout.addWidget(self.label)
        self.setLayout(layout)



if __name__ == '__main__':
    app = QtGui.QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()