尝试使用 qtdesigner 而不是一直手动创建 gui。无法开始使用列表视图

Question

我正在为一些我认为很简单但看不到的事情而苦苦挣扎。

我正在尝试开始使用 qtdesigner 进行我的 gui 设计和维护，但我在解决如何从 qtdesigner 的输出中访问它们时遇到问题。我已经通过 pyuic5.exe 运行它们并从设计器的 xml 生成 Python 代码并设置一个 app.py 以将其导入以运行我的代码。

这里是 app.py：

import sys
from PyQt5 import QtGui
from PyQt5.QtGui import QStandardItem, QStandardItemModel

from PyQt5.QtWidgets import (
    QApplication, QDialog, QMainWindow, QMessageBox, QListView
)

from PyQt5.QtSql import (
    QSqlDatabase, QSqlDriver, QSqlQuery
)

import PyQt5.QtCore

from PyQt5.uic import loadUi

from main_window_ui import Ui_MainWindow

class Window(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setupUi(self)
        self.connectSignalsSlots()
        updateTemplateList()
    def connectSignalsSlots(self):
        self.action_Exit.triggered.connect(self.close)
        #self.action_About.triggered.connect(self.about)

def updateTemplateList():
    model = QStandardItemModel()
    listView.setModel(model)

    entries = ['one','two', 'three']

    for i in entries:
        item = QStandardItem(i)
        model.appendRow(item)

    model.layoutChanged.emit()

def checkDB():
    # Try to open the connection and handle possible errors
    if not con.open():
        QMessageBox.critical(
            None,
            "App Name - Error!",
            "Database Error: %s" % con.lastError().databaseText(),
        )
        sys.exit(1)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    checkDB()
    win = Window()
    win.show()
    sys.exit(app.exec())

运行pyui5.exe后的设计器输出为：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file '.\ui\main_window_ui.ui'
#
# Created by: PyQt5 UI code generator 5.15.4
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(309, 652)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.listView = QtWidgets.QListView(self.centralwidget)
        self.listView.setGeometry(QtCore.QRect(10, 40, 291, 521))
        self.listView.setObjectName("listView")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(10, 570, 93, 28))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(210, 570, 93, 28))
        self.pushButton_2.setObjectName("pushButton_2")
        self.pushButton_3 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_3.setGeometry(QtCore.QRect(110, 570, 93, 28))
        self.pushButton_3.setObjectName("pushButton_3")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(60, 10, 211, 16))
        font = QtGui.QFont()
        font.setPointSize(11)
        self.label.setFont(font)
        self.label.setObjectName("label")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 309, 26))
        self.menubar.setObjectName("menubar")
        self.menu_file = QtWidgets.QMenu(self.menubar)
        self.menu_file.setObjectName("menu_file")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.action_Exit = QtWidgets.QAction(MainWindow)
        self.action_Exit.setObjectName("action_Exit")
        self.actionAbout = QtWidgets.QAction(MainWindow)
        self.actionAbout.setObjectName("actionAbout")
        self.menu_file.addAction(self.action_Exit)
        self.menu_file.addAction(self.actionAbout)
        self.menubar.addAction(self.menu_file.menuAction())

        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", "Edit"))
        self.pushButton_2.setText(_translate("MainWindow", "Delete"))
        self.pushButton_3.setText(_translate("MainWindow", "Add"))
        self.label.setText(_translate("MainWindow", "Job Data for instructions"))
        self.menu_file.setTitle(_translate("MainWindow", "&File"))
        self.action_Exit.setText(_translate("MainWindow", "&Exit"))
        self.actionAbout.setText(_translate("MainWindow", "About"))

我正在尝试使用 updateTemplateList() 更新此处的列表视图，但似乎无法到达那里。

提前感谢您的帮助:-)

Answer 1

主要的错误是你引用了不存在的对象，例如 listView 没有被创建并且和Ui_MainWindow 的 listView 属性不同，必须通过实例引用。

import sys

from PyQt5.QtGui import QStandardItem, QStandardItemModel
from PyQt5.QtWidgets import QApplication, QMainWindow, QListView

from main_window_ui import Ui_MainWindow


class Window(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setupUi(self)
        self.model = QStandardItemModel()
        self.listView.setModel(self.model)
        self.connectSignalsSlots()
        self.updateTemplateList()

    def connectSignalsSlots(self):
        self.action_Exit.triggered.connect(self.close)
        # self.action_About.triggered.connect(self.about)

    def updateTemplateList(self):
        entries = ["one", "two", "three"]
        for i in entries:
            item = QStandardItem(i)
            self.model.appendRow(item)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = Window()
    win.show()
    sys.exit(app.exec())

_{建议：复习你的OOP笔记，尤其是继承、实例等概念。}