本文是對《Python Qt GUI快速編程》的第9章的堆疊窗口例子Vehicle Rental用Python3+PyQt5+Qt Designer進(jìn)行改寫。
第一部分無借用Qt Designer，完全用代碼實現(xiàn)。
第二部分則借用Qt Designer，快速實現(xiàn)。

第一部分：

import sysfrom PyQt5.QtCore import (Qt)from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog, QDialogButtonBox, QFrame, QGridLayout, QHBoxLayout, QLabel, QSpinBox, QStackedWidget, QVBoxLayout, QWidget)class VehicleRentalDlg(QDialog): def __init__(self, parent=None): super(VehicleRentalDlg, self).__init__(parent) vehicleLabel = QLabel("&Vehicle Type:") self.vehicleComboBox = QComboBox() vehicleLabel.setBuddy(self.vehicleComboBox) self.vehicleComboBox.addItems(["Car", "Van"]) colorLabel = QLabel("Co&lor:") self.colorComboBox = QComboBox() colorLabel.setBuddy(self.colorComboBox) self.colorComboBox.addItems(["Black", "Blue", "Green", "Red",     "Silver", "White", "Yellow"]) seatsLabel = QLabel("&Seats:") self.seatsSpinBox = QSpinBox() seatsLabel.setBuddy(self.seatsSpinBox) self.seatsSpinBox.setRange(2, 12) self.seatsSpinBox.setValue(4) self.seatsSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter) weightLabel = QLabel("&Weight:") self.weightSpinBox = QSpinBox() weightLabel.setBuddy(self.weightSpinBox) self.weightSpinBox.setRange(1, 8) self.weightSpinBox.setValue(1) self.weightSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter) self.weightSpinBox.setSuffix(" tons") volumeLabel = QLabel("Volu&me") self.volumeSpinBox = QSpinBox() volumeLabel.setBuddy(self.volumeSpinBox) self.volumeSpinBox.setRange(4, 22) self.volumeSpinBox.setValue(10) self.volumeSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter) self.volumeSpinBox.setSuffix(" cu m") mileageLabel = QLabel("Max. Mileage") self.mileageLabel = QLabel("1000 miles") self.mileageLabel.setAlignment(Qt.AlignRight|Qt.AlignVCenter) self.mileageLabel.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken) self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|      QDialogButtonBox.Cancel) self.stackedWidget = QStackedWidget() carWidget = QWidget() carLayout = QGridLayout() carLayout.addWidget(colorLabel, 0, 0) carLayout.addWidget(self.colorComboBox, 0, 1) carLayout.addWidget(seatsLabel, 1, 0) carLayout.addWidget(self.seatsSpinBox, 1, 1) carWidget.setLayout(carLayout) self.stackedWidget.addWidget(carWidget) vanWidget = QWidget() vanLayout = QGridLayout() vanLayout.addWidget(weightLabel, 0, 0) vanLayout.addWidget(self.weightSpinBox, 0, 1) vanLayout.addWidget(volumeLabel, 1, 0) vanLayout.addWidget(self.volumeSpinBox, 1, 1) vanWidget.setLayout(vanLayout) self.stackedWidget.addWidget(vanWidget) topLayout = QHBoxLayout() topLayout.addWidget(vehicleLabel) topLayout.addWidget(self.vehicleComboBox) bottomLayout = QHBoxLayout() bottomLayout.addWidget(mileageLabel) bottomLayout.addWidget(self.mileageLabel) layout = QVBoxLayout() layout.addLayout(topLayout) layout.addWidget(self.stackedWidget) layout.addLayout(bottomLayout) layout.addWidget(self.buttonBox) self.setLayout(layout) self.buttonBox.accepted.connect(self.accept) self.buttonBox.rejected.connect(self.reject) self.vehicleComboBox.currentIndexChanged[str].connect(self.setWidgetStack) self.weightSpinBox.valueChanged[int].connect(self.weightChanged) self.setWindowTitle("Vehicle Rental") def setWidgetStack(self, text): if text == "Car":  self.stackedWidget.setCurrentIndex(0)  self.mileageLabel.setText("1000 miles") else:  self.stackedWidget.setCurrentIndex(1)  self.weightChanged(self.weightSpinBox.value()) def weightChanged(self, amount): self.mileageLabel.setText("{0} miles".format(8000 / amount))app = QApplication(sys.argv)form = VehicleRentalDlg()form.show()app.exec_()