按钮和功能在 PyQT5 应用程序的第二个窗口不起作用

Question

在我的应用程序中，我有 2 个 QMainWindows。使用 pyuic5 生成的 UI 文件并存储在单独的文件中。当我单击 MainWindow 中的按钮时，会打开另一个名为 BlockWindow 的窗口。在这个窗口中init func 存储方法“loaddata”，它加载QTableWidget 中的数据。但是，当您打开第二个窗口时，什么也没有发生。但是，如果您单独调试文件 BlockWindow(second window)，它可以完美运行。你能提出问题的真正原因吗？

MainWindow.py

from MainWindowUI import Ui_MainWindow
from BlockWindowUI import Ui_BlockWindow

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent = None):
        super(MainWindow, self).__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.ui.pushButton.clicked.connect(self.loaddata)
        self.ui.action.triggered.connect(self.openJournal)
        self.ui.action_4.triggered.connect(exit)
        self.ui.label_2 = QLabel('<h1 style="color: rgb(255, 255, 255);"></h1>')
        self.loaddata()

   def loaddata(self):
        conn = pyodbc.connect(
            "Driver={ODBC Driver 17 for SQL Server};Server=DESKTOP-49J58F3\SQLEXPRESS;Database=Plan;Trusted_Connection=yes;")
        query = "SELECT nn, name, metering, volume, date_end, responsible, txt_name from dbo.Card_plan"
        result = conn.execute(query).fetchall()
        self.ui.tableWidget.clearSelection()
        self.ui.tableWidget.setRowCount(0)
        for row_number, row_data in enumerate(result):
            self.ui.tableWidget.insertRow(row_number)
            for column_number, data in enumerate(row_data):
                self.ui.tableWidget.setItem(row_number, column_number, QtWidgets.QTableWidgetItem(str(data)))
        conn.commit()

    def openJournal(self):
        self.BlockWindow = QtWidgets.QMainWindow()
        self.ui = Ui_BlockWindow()
        self.ui.setupUi(self.BlockWindow)
        self.BlockWindow.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

BlockWindow.py

from BlockWindowUI import *

class BlockWindow(QtWidgets.QMainWindow, Ui_BlockWindow):
    def __init__(self):
        super(BlockWindow, self).__init__()
        self.ui = Ui_BlockWindow()
        self.ui.setupUi(self)
        self.ui.pushButton_3.clicked.connect(self.dels)
        self.ui.pushButton_4.clicked.connect(BlockWindow.close)
        self.ui.label_2 = QLabel('<h1 style="color: rgb(255, 255, 255);"></h1>')
        self.loaddata()

    def loaddata(self):
        conn = pyodbc.connect(
            "Driver={ODBC Driver 17 for SQL Server};Server=DESKTOP-49J58F3\SQLEXPRESS;Database=Plan;Trusted_Connection=yes;")
        query = "SELECT * from dbo.Block"
        result = conn.execute(query).fetchall()
        self.ui.tableWidget.setRowCount(0)
        for row_number, row_data in enumerate(result):
            self.ui.tableWidget.insertRow(row_number)
            for column_number, data in enumerate(row_data):
                self.ui.tableWidget.setItem(row_number, column_number, QtWidgets.QTableWidgetItem(str(data)))
        conn.commit()

Answer 1

在您的 MainWindow 类中尝试将您的 openJournal 方法更改为：

    def openJournal(self):
        self.BlockWindow = BlockWindow()
        self.BlockWindow.show()

别忘了将你的类导入 MainWindow.py：

from BlockWindow import BlockWindow