PyQT5：如何连续打开和关闭 3 个窗口答案

【问题标题】：PyQT5: How to open and close 3 windows consecutivelyPyQT5：如何连续打开和关闭 3 个窗口
【发布时间】：2019-03-16 21:22:09
【问题描述】：

我的 GUI 处理过程中出现问题。我有 3 个窗口，它是主窗口 -> 第二个窗口 -> 第三个窗口，然后退出。单击转到第 2 个窗口的按钮时效果很好，但是如果我单击转到第 3 个窗口的按钮，它会崩溃。

整个过程都崩溃了，没有说任何错误。

这是我的第一个窗口的代码：

from window2 import *
from window3 import *

class Ui_MainWindow(object):
def openWindow2(self):
    self.window = QtWidgets.QMainWindow()
    self.ui = Ui_MainWindow2()
    self.ui.setupUi2(self.window)
    MainWindow.hide()
    self.window.show()

def setupUi(self, MainWindow):
    MainWindow.setObjectName("MainWindow")
    MainWindow.resize(637, 309)
    self.centralwidget = QtWidgets.QWidget(MainWindow)
    self.centralwidget.setObjectName("centralwidget")
    self.label = QtWidgets.QLabel(self.centralwidget)
    self.label.setGeometry(QtCore.QRect(230, 90, 341, 16))
    self.label.setObjectName("label")
    self.pushButton = QtWidgets.QPushButton(self.centralwidget)
    self.pushButton.setGeometry(QtCore.QRect(520, 230, 75, 23))
    self.pushButton.setObjectName("pushButton")

    self.pushButton.clicked.connect(self.openWindow2)

    MainWindow.setCentralWidget(self.centralwidget)
    self.statusbar = QtWidgets.QStatusBar(MainWindow)
    self.statusbar.setObjectName("statusbar")
    MainWindow.setStatusBar(self.statusbar)

    self.retranslateUi(MainWindow)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)

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_())

这是第二个窗口的代码：

from window3 import *
class Ui_MainWindow2(object):

def openWindow3(self):

    self.window = QtWidgets.QMainWindow()
    self.ui = Ui_MainWindow3()
    self.ui.setupUi3(self.window)
    MainWindow.hide()
    self.window.show()

def setupUi2(self, MainWindow):
    MainWindow.setObjectName("MainWindow")
    MainWindow.resize(481, 242)
    self.centralwidget = QtWidgets.QWidget(MainWindow)
    self.centralwidget.setObjectName("centralwidget")
    self.pushButton = QtWidgets.QPushButton(self.centralwidget)
    self.pushButton.setGeometry(QtCore.QRect(340, 180, 75, 23))
    self.pushButton.setObjectName("pushButton")

    self.pushButton.clicked.connect(self.openWindow3)

    self.label = QtWidgets.QLabel(self.centralwidget)
    self.label.setGeometry(QtCore.QRect(210, 100, 61, 16))
    self.label.setObjectName("label")
    MainWindow.setCentralWidget(self.centralwidget)
    self.statusbar = QtWidgets.QStatusBar(MainWindow)
    self.statusbar.setObjectName("statusbar")
    MainWindow.setStatusBar(self.statusbar)

    self.retranslateUi(MainWindow)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow2()
    ui.setupUi2(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

这是第三个窗口的代码：

from window1 import *
from window2 import *

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow3(object):
def setupUi3(self, MainWindow):
    MainWindow.setObjectName("MainWindow")
    MainWindow.resize(397, 319)
    self.centralwidget = QtWidgets.QWidget(MainWindow)
    self.centralwidget.setObjectName("centralwidget")
    self.label = QtWidgets.QLabel(self.centralwidget)
    self.label.setGeometry(QtCore.QRect(180, 110, 47, 13))
    self.label.setObjectName("label")
    self.pushButton = QtWidgets.QPushButton(self.centralwidget)
    self.pushButton.setGeometry(QtCore.QRect(290, 250, 75, 23))
    self.pushButton.setObjectName("pushButton")
    MainWindow.setCentralWidget(self.centralwidget)
    self.statusbar = QtWidgets.QStatusBar(MainWindow)
    self.statusbar.setObjectName("statusbar")
    MainWindow.setStatusBar(self.statusbar)

    self.retranslateUi(MainWindow)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow3()
    ui.setupUi3(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

谁能告诉我为什么当按钮单击时进程在第二个窗口中崩溃以及为什么它无法继续到第三个窗口？

【问题讨论】：

标签： user-interface pyqt5 qwindow

【解决方案1】：

试试看：

window1.py

from window2 import *
from window3 import *
from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def openWindow2(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_MainWindow2(self.window)                # +++ self.window
        self.ui.setupUi2(self.window)
        MainWindow.hide()
        self.window.show()

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(637, 309)
        MainWindow.setWindowTitle('Window 1')
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(230, 90, 341, 16))
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton("Button 1", self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(520, 230, 75, 23))
        self.pushButton.setObjectName("pushButton")

        self.pushButton.clicked.connect(self.openWindow2)

        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

#        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)



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_())

window2.py

from window3 import *
from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow2(object):
    def __init__(self, window2, *args, **kwargs):              # +++
        super(Ui_MainWindow2, self).__init__(*args, **kwargs)  # +++
        self.window2 = window2                                 # +++  

    def openWindow3(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_MainWindow3()
        self.ui.setupUi3(self.window)

#        MainWindow.hide()                                     # ---
        self.window2.hide()                                    # +++

        self.window.show()

    def setupUi2(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(481, 242)
        MainWindow.setWindowTitle('Window 2')
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton("Button 2", self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(340, 180, 75, 23))
        self.pushButton.setObjectName("pushButton")

        self.pushButton.clicked.connect(self.openWindow3)

        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(210, 100, 61, 16))
        self.label.setObjectName("label")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

#        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow2()
    ui.setupUi2(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

window3.py

from window1 import *
from window2 import *

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow3(object):
    def setupUi3(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(397, 319)
        MainWindow.setWindowTitle('Window 3')
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(180, 110, 47, 13))
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton("Button 3", self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(290, 250, 75, 23))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

#        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow3()
    ui.setupUi3(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

更新

window1.py

from window2 import *
from window3 import *
from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def openWindow2(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_MainWindow2(self.window)                # +++ self.window
        self.ui.setupUi2(self.window)
        MainWindow.hide()
        self.window.show()

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(637, 309)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(230, 90, 341, 16))
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(520, 230, 75, 23))
        self.pushButton.setObjectName("pushButton")

        self.pushButton.clicked.connect(self.openWindow2)

        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", "Window 1"))
        self.pushButton.setText(_translate("MainWindow", "Button 1"))
        #...        

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_())

window2.py

from window3 import *
from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow2(object):
    def __init__(self, window2, *args, **kwargs):              # +++
        super(Ui_MainWindow2, self).__init__(*args, **kwargs)  # +++
        self.window2 = window2                                 # +++  

    def openWindow3(self):
        self.window = QtWidgets.QMainWindow()
        self.ui = Ui_MainWindow3()
        self.ui.setupUi3(self.window)

#        MainWindow.hide()                                     # ---
        self.window2.hide()                                    # +++

        self.window.show()

    def setupUi2(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(481, 242)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(340, 180, 75, 23))
        self.pushButton.setObjectName("pushButton")

        self.pushButton.clicked.connect(self.openWindow3)

        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(210, 100, 61, 16))
        self.label.setObjectName("label")
        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", "Window 2"))
        self.pushButton.setText(_translate("MainWindow", "Button 2"))
        #...        


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow2()
    ui.setupUi2(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

window3.py

from window1 import *
from window2 import *

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow3(object):
    def setupUi3(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(397, 319)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(180, 110, 47, 13))
        self.label.setObjectName("label")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(280, 250, 95, 23))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.pushButton.clicked.connect(MainWindow.close)              # +++

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Window 3"))
        self.pushButton.setText(_translate("MainWindow", "Button 3 (Quit)"))
        #... 

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow3()
    ui.setupUi3(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

【讨论】：

感谢 S.nick 先生，它可以工作，但是当我单击按钮 3 时如何关闭窗口 3？因为我尝试制作def close(self): Mainwindow.close()，但它无法关闭窗口 3？如何关闭它？
将self.pushButton.clicked.connect (MainWindow.close)这一行添加到window3.py
谢谢先生，非常感谢您的帮助。
我需要评论所有self.retranslateUi(MainWindow) 吗？因为它删除了我使用的所有组件
我尝试了所有这些小时来在我的系统中实施它，但它不起作用。