无法从 PyQT5 文本字段中获取文本

Posted 2023-03-30

【中文标题】无法从 PyQT5 文本字段中获取文本

【英文标题】：Cant get text from the PyQT5 text field

【发布时间】：2020-01-02 14:56:16

【问题描述】：

不明白为什么我从文本字段中得到空字符串，这是我的代码：

class MyMainWindow(QMainWindow, test.Ui_MainWindow):
    def __init__(self):
        super().__init__()
        super().setupUi(self)

        self.pushButton.clicked.connect(self.click)

    def click(self):
        text = self.plainTextEdit.toPlainText()
        print('Text: ' + str(text))
        print()


if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QMainWindow()
    mainWindow = MyMainWindow()
    mainWindow.setupUi(window)
    mainWindow.show()
    sys.exit(app.exec_())

https://pastebin.com/gpDSysL2

以及QT Designer生成的.py文件：

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.plainTextEdit = QtWidgets.QPlainTextEdit(self.centralwidget)
        self.plainTextEdit.setGeometry(QtCore.QRect(270, 260, 104, 71))
        self.plainTextEdit.setObjectName("plainTextEdit")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(270, 350, 75, 23))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 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", "PushButton"))

当我单击按钮时，它会打印 empy 字符串 这是我收到>>> Screenshot

的问题的屏幕截图

非常感谢您的任何帮助

【参考方案1】：

问题在于双重调用 setupUI() 方法：

if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = QMainWindow()
    mainWindow = MyMainWindow()
    # mainWindow.setupUi(window)  <<< HERE WAS THE PROBLEM, JUST DELETEd THIS LINE AND THATS ALL
    mainWindow.show()
    sys.exit(app.exec_())

也许有人会有同样的问题