1.动态加载 ui 方式,重写关闭窗体事件

1. 静态加载

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from PySide6.QtCore import *
from PySide6.QtGui import *
from PySide6.QtWidgets import *


class Ui_Form(object):
    def setupUi(self, Form):
        if not Form.objectName():
            Form.setObjectName(u"Form")
        Form.resize(732, 584)
        self.verticalLayout = QVBoxLayout(Form)
        self.verticalLayout.setObjectName(u"verticalLayout")
        self.textEdit = QPlainTextEdit(Form)
        self.textEdit.setObjectName(u"textEdit")

        self.verticalLayout.addWidget(self.textEdit)
        
        self.button = QPushButton(Form)
        self.button.setObjectName(u"button")
        
        self.verticalLayout.addWidget(self.button)
        self.retranslateUi(Form)
        QMetaObject.connectSlotsByName(Form)
    # setupUi

    def retranslateUi(self, Form):
        Form.setWindowTitle(QCoreApplication.translate("Form", u"\u7edf\u8ba1\u85aa\u8d44", None))
        self.textEdit.setPlaceholderText(QCoreApplication.translate("Form", u"\u8bf7\u8f93\u5165\u85aa\u8d44\u4fe1\u606f", None))
        self.button.setText(QCoreApplication.translate("Form", u"\u7edf\u8ba1", None))
    # retranslateUi
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# 静态加载py窗口函数  同时继承重写
from PySide6.QtWidgets import QApplication, QMessageBox, QWidget
from PySide6.QtUiTools import QUiLoader
from PySide6.QtCore import Qt
import sys
from stats import Ui_Form


class Win(Ui_Form, QWidget):
    def __init__(self):
        super().__init__()
        # 第一种
        self.setupUi(self)
        # 第二种  可以把该界面的按钮功能和其他界面区分
        # self.ui = Ui_Form()
        # self.ui.setupUi(self)

    def closeEvent(self, event):
        reply = QMessageBox.question(self, '关闭提示', "是否要退出界面？",
                                     QMessageBox.Yes | QMessageBox.No, QMessageBox.No)

        if reply == QMessageBox.Yes:
            event.accept()
        elif reply == QMessageBox.No:
            event.ignore()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Win()
    window.setWindowFlags(Qt.Window)
    window.show()
    sys.exit(app.exec_())

2. 动态加载

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# 动态加载py窗口函数  同时继承重写
from PySide6.QtWidgets import QApplication, QMessageBox, QWidget
from PySide6.QtUiTools import loadUiType
from PySide6.QtCore import Qt
import sys

InitUi, _ = loadUiType("stats.ui")


class Win(InitUi, QWidget):
    def __init__(self):
        super().__init__()
        self.setupUi(self)

    def closeEvent(self, event):
        reply = QMessageBox.question(self, '关闭提示', "是否要退出界面？",
                                     QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
        if reply == QMessageBox.Yes:
            event.accept()
        elif reply == QMessageBox.No:
            event.ignore()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Win()
    window.setWindowFlags(Qt.Window)
    window.show()
    sys.exit(app.exec_())
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from PySide2.QtWidgets import QApplication, QMessageBox
from PySide2.QtUiTools import QUiLoader
import sys


class Win:

    def __init__(self):
        self.ui = QUiLoader().load("stats.ui")


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Win()
    window.setWindowFlags(Qt.Window)
    window.show()
    sys.exit(app.exec_())

按照此方法不成功是因为我们在载入ui文件时，使用了 QuiLoader().load()方法，这个方法不能够接收主窗体（MainWindow）的 Close() 事件，所以需要重写 QuiLoader() 方法。

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# 代码段2
class UiLoader(QtUiTools.QUiLoader):
    # ui实例
    uiinstance = None

    # 重写方法
    def createWidget(self, classname, parent=None, name=''):
        # 判断是否存在
        if parent is None and self.uiinstance is not None:
            widget = self.uiinstance
        else:
            widget = super(UiLoader, self).createWidget(classname, parent, name)
            if self.uiinstance is not None:
                setattr(self.uiinstance, name, widget)
        return widget

    # 加载UI
    def loadUi(self, uifile, ui=None):
        self.uiinstance = ui
        widget = self.load(uifile)
        QtCore.QMetaObject.connectSlotsByName(widget)
        return widget
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from PySide2.QtWidgets import QApplication, QMessageBox
from PySide2.QtUiTools import QUiLoader
import sys


class Win:

  def __init__(self):
    qfile_bom = QFile("ui/BomSoftware.ui")  # 指定路径
    qfile_bom.open(QFile.ReadWrite)
    qfile_bom.close()
    # self.ui = QUiLoader().load(qfile_bom) 原先的加载ui方式
    self.ui = UiLoader().loadUi(qfile_bom, self)  # 使用重写的loadUI方法


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Win()
    window.setWindowFlags(Qt.Window)
    window.show()
    sys.exit(app.exec_())