如何从拆分框中为变量赋值？

Question

我在 Qt 设计器中创建了一个带有两个窗口 (Qspinbox) 和一个按钮 (QPushButton) 的基本模板。想法是这样的。用户在两个字段中输入数字，按下按钮，程序就会使用这些数字执行某些操作。 （例如，它加起来）。我知道您需要创建一个函数来指定用户输入的数字需要做什么。将“按钮单击”事件绑定到此函数。 （我可以将一个按钮单击链接到一个函数。）但这是我如何将用户输入的值分配给变量以便进一步使用它们（使用变量）。请帮忙，我正在为第二周而战！以下是源代码：

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(507, 294)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(270, 200, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.layoutWidget = QtWidgets.QWidget(self.centralwidget)
        self.layoutWidget.setGeometry(QtCore.QRect(90, 100, 291, 22))
        self.layoutWidget.setObjectName("layoutWidget")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.layoutWidget)
        self.horizontalLayout_2.setContentsMargins(0, 0, 0, 0)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.label_2 = QtWidgets.QLabel(self.layoutWidget)
        self.label_2.setObjectName("label_2")
        self.horizontalLayout_2.addWidget(self.label_2)
        self.spinBox_2 = QtWidgets.QSpinBox(self.layoutWidget)
        self.spinBox_2.setObjectName("spinBox_2")
        self.horizontalLayout_2.addWidget(self.spinBox_2)
        self.widget = QtWidgets.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(90, 30, 291, 22))
        self.widget.setObjectName("widget")
        self.horizontalLayout = QtWidgets.QHBoxLayout(self.widget)
        self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(self.widget)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.spinBox = QtWidgets.QSpinBox(self.widget)
        self.spinBox.setObjectName("spinBox")
        self.horizontalLayout.addWidget(self.spinBox)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 507, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "calculate"))
        self.label_2.setText(_translate("MainWindow", "Input second number:"))
        self.label.setText(_translate("MainWindow", "Input first number:"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

这是我为实现目标而添加的内容。我做错了什么？

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(507, 294)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(270, 200, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.layoutWidget = QtWidgets.QWidget(self.centralwidget)
        self.layoutWidget.setGeometry(QtCore.QRect(90, 100, 291, 22))
        self.layoutWidget.setObjectName("layoutWidget")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.layoutWidget)
        self.horizontalLayout_2.setContentsMargins(0, 0, 0, 0)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.label_2 = QtWidgets.QLabel(self.layoutWidget)
        self.label_2.setObjectName("label_2")
        self.horizontalLayout_2.addWidget(self.label_2)
        self.spinBox_2 = QtWidgets.QSpinBox(self.layoutWidget)
        self.spinBox_2.setObjectName("spinBox_2")
        self.horizontalLayout_2.addWidget(self.spinBox_2)
        self.widget = QtWidgets.QWidget(self.centralwidget)
        self.widget.setGeometry(QtCore.QRect(90, 30, 291, 22))
        self.widget.setObjectName("widget")
        self.horizontalLayout = QtWidgets.QHBoxLayout(self.widget)
        self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(self.widget)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.spinBox = QtWidgets.QSpinBox(self.widget)
        self.spinBox.setObjectName("spinBox")
        self.horizontalLayout.addWidget(self.spinBox)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 507, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "calculate"))
        self.label_2.setText(_translate("MainWindow", "Input second number:"))
        self.label.setText(_translate("MainWindow", "Input first number:"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()

    def calc(self):
        first_n = self.label_2.value()
        second_n = self.label.value()

        result = first_n + second_n
        print(result)
ui.pushButton.clicked.connect(calc)


sys.exit(app.exec_())

相信calc方法写在上面"if __name__ == "__main__":"上面会更好 5:41 但随后出现跟踪错误：NameError: name 'calc' is not defined

Answer 1

在 Python 中，名称 self 用于提及当前对象。在您的代码中，您应该在 Ui_mainwindow 类中定义 calc，这使得 calc 成为 Ui_mainwindow 的方法，而不是在类之外。