PyQt关闭子窗口问题，无限循环？

Question

在编写一些代码时，我偶然发现了一个我无法解决的问题。我已经剥离了代码以仅显示问题。我试过使用 MainWindow.close() 但它关闭了第一个窗口。 控制台错误是：

self.close()
  [Previous line repeated 993 more times]
RecursionError: maximum recursion depth exceeded

import sys
from PyQt5 import QtWidgets, QtGui, QtCore

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText("Open new window")
        self.pushButton.clicked.connect(self.open)

    def open(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_SecondWindow()
        self.ui.setupUi(self.window)
        self.window.show()

class Ui_SecondWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText("Close new window")
        self.pushButton.clicked.connect(self.close)

    def close(self):
        self.close()   

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

Answer 1

下一部分指向这个的错误：

def close(self):
    self.close()   

由于调用 self.close()，您正在调用调用返回的 self.close() 的类的 close() 方法，并且如您所见，它会生成一个无限循环。

另外一个错误是PyQt不建议修改pyuic生成的代码，建议再创建一个继承自相应窗口的类，并使用pyuic生成的类作为接口。

考虑到上一部分的说明，解决方法是：

import sys
from PyQt5 import QtWidgets, QtGui, QtCore

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText("Open new window")

class Ui_SecondWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText("Close new window")

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.open)

    @QtCore.pyqtSlot()
    def open(self):
        self.window = SecondWindow()
        self.window.show()

class SecondWindow(QtWidgets.QMainWindow, Ui_SecondWindow):
    def __init__(self, parent=None):
        super(SecondWindow, self).__init__(parent)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.close)

if __name__ == "__main__": 
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

Answer 2

说实话：

import sys
from PyQt5 import QtWidgets, QtGui, QtCore

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText("Open new window")
        self.pushButton.clicked.connect(self.open)

    def open(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_SecondWindow()
        self.ui.setupUi(self.window)
        self.window.show()



class Ui_SecondWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.setText("Close new window")
        self.pushButton.clicked.connect(MainWindow.close)     # - self.close

#    def close(self):
#        self.close()   

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