import sys from PyQt5.QtWidgets import * from PyQt5.QtCore import * from PyQt5.QtGui import * ################################################ #######創建主窗口 ################################################ class MainWindow(QMainWindow):windowList = []def __init__(self, *args, **kwargs):super().__init__(*args, **kwargs)self.setWindowTitle('主界面')self.showMaximized()# 創建菜單欄self.createMenus()def createMenus(self):# 創建動作 注銷self.printAction1 = QAction(self.tr("注銷"), self)self.printAction1.triggered.connect(self.on_printAction1_triggered)# 創建動作 退出self.printAction2 = QAction(self.tr("退出"), self)self.printAction2.triggered.connect(self.on_printAction2_triggered)# 創建菜單，添加動作self.printMenu = self.menuBar().addMenu(self.tr("注銷和退出"))self.printMenu.addAction(self.printAction1)self.printMenu.addAction(self.printAction2)# 動作一：注銷def on_printAction1_triggered(self):self.close()dialog = logindialog()if dialog.exec_()==QDialog.Accepted:the_window = MainWindow()self.windowList.append(the_window) #這句一定要寫，不然無法重新登錄the_window.show()# 動作二：退出def on_printAction2_triggered(self):self.close()# 關閉界面觸發事件def closeEvent(self, event):print(999999999)pass################################################ #######對話框 ################################################ class logindialog(QDialog):def __init__(self, *args, **kwargs):super().__init__(*args, **kwargs)self.setWindowTitle('登錄界面')self.resize(200, 200)self.setFixedSize(self.width(), self.height())self.setWindowFlags(Qt.WindowCloseButtonHint)###### 設置界面控件self.frame = QFrame(self)self.verticalLayout = QVBoxLayout(self.frame)self.lineEdit_account = QLineEdit()self.lineEdit_account.setPlaceholderText("請輸入賬號")self.verticalLayout.addWidget(self.lineEdit_account)self.lineEdit_password = QLineEdit()self.lineEdit_password.setPlaceholderText("請輸入密碼")self.verticalLayout.addWidget(self.lineEdit_password)self.pushButton_enter = QPushButton()self.pushButton_enter.setText("確定")self.verticalLayout.addWidget(self.pushButton_enter)self.pushButton_quit = QPushButton()self.pushButton_quit.setText("取消")self.verticalLayout.addWidget(self.pushButton_quit)###### 綁定按鈕事件self.pushButton_enter.clicked.connect(self.on_pushButton_enter_clicked)self.pushButton_quit.clicked.connect(QCoreApplication.instance().quit)def on_pushButton_enter_clicked(self):# 賬號判斷if self.lineEdit_account.text() == "":return# 密碼判斷if self.lineEdit_password.text() == "":return# 通過驗證，關閉對話框并返回1self.accept()################################################ #######程序入門 ################################################ if __name__ == "__main__":app = QApplication(sys.argv)dialog = logindialog()if dialog.exec_()==QDialog.Accepted:the_window = MainWindow()the_window.show()sys.exit(app.exec_())

問題原因 the_window是個臨時變量，所在的方法執行完畢后就destroyed了，
解決方法 如果要想不被銷毀，則將the_window變成本類中的變量即可，即將the_window變成self.the_window即可，或者將the_window放到本類中的widget中也可

參考資料
pyqt中QWidget的show 一閃而過的原因及解決辦法

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