PyQt5调用close()误关主窗口，求仅关闭子窗口的方法

问题场景 #

使用PyQt5开发GUI程序时，主窗口按钮可打开包含stackedWidget的子窗口，但点击子窗口的“Finish”按钮调用self.close()时，主窗口会一并关闭，需求是仅关闭子窗口。

问题根源 #

1. 子窗口的Ui_screen1类自定义了递归的close()方法，该方法未调用Qt窗口的原生关闭逻辑，反而无限递归自身，同时覆盖了窗口的原生关闭方法。
2. UI类未正确关联到子窗口的QMainWindow实例，调用self.close()时无法正确指向子窗口对象，导致触发错误的关闭逻辑。

解决步骤 #

1. 删除自定义递归close()方法：移除Ui_screen1中定义的def close(self): self.close()，恢复Qt窗口的原生关闭逻辑。
2. 直接绑定子窗口实例的关闭方法：在按钮点击事件中，直接调用传入的MainWindow实例的close()方法，确保关闭的是子窗口。
3. 修正UI布局细节：调整子窗口菜单栏宽度与窗口一致，避免布局异常。

修改后的子窗口screen1代码 #

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_screen1(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(384, 567)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        # 直接绑定子窗口实例的close方法
        self.button = QtWidgets.QPushButton(self.centralwidget, clicked=MainWindow.close)
        self.button.setGeometry(QtCore.QRect(120, 260, 131, 51))
        self.button.setObjectName("buton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        # 修正菜单栏宽度与窗口一致
        self.menubar.setGeometry(QtCore.QRect(0, 0, 384, 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", "子窗口"))
        self.button.setText(_translate("MainWindow", "Close"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_screen1()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

修改后的Finish按钮事件代码 #

def click_next(self):
    if self.next.text() != "Finish>":
        if self.stackedWidget.currentIndex() != 2:
            self.stackedWidget.setCurrentIndex(self.stackedWidget.currentIndex() + 1)
        else:
            self.next.setText("Finish>")
            self.stackedWidget.setCurrentIndex(self.stackedWidget.currentIndex() + 1)
    else:
        # 通过parent()获取子窗口实例并关闭
        self.parent().close()

优化后的主窗口代码 #

from PyQt5 import QtCore, QtGui, QtWidgets
from screen1 import Ui_screen1

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(584, 567)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.button = QtWidgets.QPushButton(self.centralwidget, clicked=self.gotoscreen1)
        self.button.setGeometry(QtCore.QRect(220, 260, 131, 51))
        self.button.setObjectName("buton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 584, 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 gotoscreen1(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_screen1()
        self.ui.setupUi(self.window)
        self.window.show()

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "主窗口"))
        self.button.setText(_translate("MainWindow", "打开子窗口"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

内容的提问来源于stack exchange，提问作者Nir Eyal