PyQt：单击按钮后更改GUI布局

我提出的解决方案基于

setupUi()

import sysfrom PyQt4.QtGui import QApplication, QMainWindow, QPushButton, QWidget#For PyQt5 :#from PyQt5.QWidgets import QApplication , QMainWindow , QPushButton , QWidgetclass UIWindow(object):    def setupUI(self, MainWindow):        MainWindow.setGeometry(50, 50, 400, 450)        MainWindow.setFixedSize(400, 450)        MainWindow.setWindowTitle("UIWindow")        self.centralwidget = QWidget(MainWindow)        # mainwindow.setWindowIcon(QtGui.QIcon('PhotoIcon.png'))        self.ToolsBTN = QPushButton('text', self.centralwidget)        self.ToolsBTN.move(50, 350)        MainWindow.setCentralWidget(self.centralwidget)class UIToolTab(object):    def setupUI(self, MainWindow):        MainWindow.setGeometry(50, 50, 400, 450)        MainWindow.setFixedSize(400, 450)        MainWindow.setWindowTitle("UIToolTab")        self.centralwidget = QWidget(MainWindow)        self.CPSBTN = QPushButton("text2", self.centralwidget)        self.CPSBTN.move(100, 350)        MainWindow.setCentralWidget(self.centralwidget)class MainWindow(QMainWindow):    def __init__(self, parent=None):        super(MainWindow, self).__init__(parent)        self.uiWindow = UIWindow()        self.uiToolTab = UIToolTab()        self.startUIWindow()    def startUIToolTab(self):        self.uiToolTab.setupUI(self)        self.uiToolTab.CPSBTN.clicked.connect(self.startUIWindow)        self.show()    def startUIWindow(self):        self.uiWindow.setupUI(self)        self.uiWindow.ToolsBTN.clicked.connect(self.startUIToolTab)        self.show()if __name__ == '__main__':    app = QApplication(sys.argv)    w = MainWindow()    sys.exit(app.exec_())

开始：

单击按钮后：

在另一个按钮单击后：

以及更优雅的解决方案：

import sysfrom PyQt4.QtGui import QApplication, QMainWindow, QPushButton, QWidget#For PyQt5 :#from PyQt5.QWidgets import QApplication , QMainWindow , QPushButton , QWidgetclass UIWindow(QWidget):    def __init__(self, parent=None):        super(UIWindow, self).__init__(parent)        # mainwindow.setWindowIcon(QtGui.QIcon('PhotoIcon.png'))        self.ToolsBTN = QPushButton('text', self)        self.ToolsBTN.move(50, 350)class UIToolTab(QWidget):    def __init__(self, parent=None):        super(UIToolTab, self).__init__(parent)        self.CPSBTN = QPushButton("text2", self)        self.CPSBTN.move(100, 350)class MainWindow(QMainWindow):    def __init__(self, parent=None):        super(MainWindow, self).__init__(parent)        self.setGeometry(50, 50, 400, 450)        self.setFixedSize(400, 450)        self.startUIToolTab()    def startUIToolTab(self):        self.ToolTab = UIToolTab(self)        self.setWindowTitle("UIToolTab")        self.setCentralWidget(self.ToolTab)        self.ToolTab.CPSBTN.clicked.connect(self.startUIWindow)        self.show()    def startUIWindow(self):        self.Window = UIWindow(self)        self.setWindowTitle("UIWindow")        self.setCentralWidget(self.Window)        self.Window.ToolsBTN.clicked.connect(self.startUIToolTab)        self.show()if __name__ == '__main__':    app = QApplication(sys.argv)    w = MainWindow()    sys.exit(app.exec_())