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python - pyqt5 从父窗口关闭子窗口

问题描述

我创建了 2 个窗口，win1并且，使用 qt 设计器win2并添加了两个按钮：btn_open_win2打开win2和关闭。win1btn_closewin2

当我win2直接运行该方法时，该close方法可以正常工作，但是当我从中运行win1并调用 win2 时，close按钮上的按钮win2无法正常运行。

我知道问题出在部分内部已定义 win2 的点，if __name__ =='__main__' 如下面的代码所示，但我无法解决此问题。

赢1：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow

class Ui_Win1(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("Win1")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.btn_open_win2 = QtWidgets.QPushButton(self.centralwidget)
        self.btn_open_win2.setGeometry(QtCore.QRect(250, 170, 131, 101))
        self.btn_open_win2.setObjectName("btn_open_win2")
        self.btn_open_win2.clicked.connect(self.on_open_win2)
        MainWindow.setCentralWidget(self.centralwidget)
        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", "Win1"))
        self.btn_open_win2.setText(_translate("MainWindow", "open win2"))

    def on_open_win2(self):
        from win2 import Ui_Win2
        self.win = QMainWindow()
        self.ui = Ui_Win2()
        self.ui.setupUi(self.win)
        self.win.show()

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    win1 = QMainWindow()
    ui = Ui_Win1()
    ui.setupUi(win1)
    win1.show()
    sys.exit(app.exec_())

赢2：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow

class Ui_Win2(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("Win2")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.btn_close = QtWidgets.QPushButton(self.centralwidget)
        self.btn_close.setGeometry(QtCore.QRect(260, 180, 131, 101))
        self.btn_close.setObjectName("btn_close")
        self.btn_close.clicked.connect(self.on_close)
        MainWindow.setCentralWidget(self.centralwidget)
        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", "Win2"))
        self.btn_close.setText(_translate("MainWindow", "close"))

    def on_close(self):
        # win2 = QMainWindow()
        # ui = Ui_Win2()
        # ui.setupUi(win2)
        win2.close()

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    win2 = QMainWindow()
    ui = Ui_Win2()
    ui.setupUi(win2)
    win2.show()
    sys.exit(app.exec_())

标签： pythonredirectpyqt5windowopen-closed-principle

解决方案

像这样改变win2：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow

class Ui_Win2(object):
    def setupUi(self, MainWindow):
        self.MainWindow = MainWindow
        MainWindow.setObjectName("Win2")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.btn_close = QtWidgets.QPushButton(self.centralwidget)
        self.btn_close.setGeometry(QtCore.QRect(260, 180, 131, 101))
        self.btn_close.setObjectName("btn_close")
        self.btn_close.clicked.connect(self.on_close)
        MainWindow.setCentralWidget(self.centralwidget)
        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", "Win2"))
        self.btn_close.setText(_translate("MainWindow", "close"))

    def on_close(self):
        # win2 = QMainWindow()
        # ui = Ui_Win2()
        # ui.setupUi(win2)
        self.MainWindow.close()

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    win2 = QMainWindow()
    ui = Ui_Win2()
    ui.setupUi(win2)
    win2.show()
    sys.exit(app.exec_())

从self.MainWindow而不是self调用 close 函数。并在setupUi函数的第一行设置self.MainWindow

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