PyQt5从子窗口关闭父窗口和子窗口

分类：编程问答

如何解决PyQt5从子窗口关闭父窗口和子窗口

我已经使用设计器制作了pyqt5 GUI，并将其转换为python代码。 我希望第一个窗口打开另一个窗口，依此类推。

win1-> win2-> win3

现在我在win3中有一个按钮，当单击该按钮时必须关闭窗口[win1，win2，win3（itself）] 并且只需重新启动win1。

我尝试为从win1打开win2和从win 2打开win3做一个定义 两者都没有引发错误，尽管对我没有用

如何执行此操作？请帮助我。

Win1 

from PyQt5 import QtCore,QtGui,QtWidgets
from win_2 import *

class Ui_Win1(object):

def setupUi(self,Win1):
    Win1.setObjectName("Win1")
    Win1.resize(640,480)
    Win1.setStyleSheet("*{background:black;}")
    self.centralwidget = QtWidgets.QWidget(Win1)
    self.centralwidget.setObjectName("centralwidget")
    self.frame = QtWidgets.QFrame(self.centralwidget)
    self.frame.setGeometry(QtCore.QRect(110,70,361,301))
    self.frame.setStyleSheet("border: 2px solid white ;\n")
    self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
    self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
    self.frame.setObjectName("frame")
    self.pushbutton1 = QtWidgets.QPushButton(self.frame)
    self.pushbutton1.setGeometry(QtCore.QRect(120,120,131,41))
    self.pushbutton1.setStyleSheet("background:white;")
    self.pushbutton1.setObjectName("pushbutton1")
    Win1.setCentralWidget(self.centralwidget)

    self.retranslateUi(Win1)
    QtCore.QMetaObject.connectSlotsByName(Win1)

    self.pushbutton1.clicked.connect(lambda: self.openwin2())  # calling function

def retranslateUi(self,Win1):
    _translate = QtCore.QCoreApplication.translate
    Win1.setWindowTitle(_translate("Win1","MainWindow"))
    self.pushbutton1.setText(_translate("Win1","Go to Win 2"))


def openwin2(self):                   #Function for opening win2
    Win2 = QtWidgets.QMainWindow()
    ui = Ui_Win2()
    ui.setupUi(Win2)
    Win2.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Win1 = QtWidgets.QMainWindow()
    ui = Ui_Win1()
    ui.setupUi(Win1)
    Win1.show()
    sys.exit(app.exec_())

Win2 

from PyQt5 import QtCore,QtWidgets
from win_3 import *

class Ui_Win2(object):
    def setupUi(self,Win2):
        Win2.setObjectName("Win2")
        Win2.resize(640,480)
        Win2.setStyleSheet("*{background:black;}")
        self.centralwidget = QtWidgets.QWidget(Win2)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(10,20,301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton2 = QtWidgets.QPushButton(self.frame)
        self.pushbutton2.setGeometry(QtCore.QRect(120,41))
        self.pushbutton2.setStyleSheet("background:white;")
        self.pushbutton2.setObjectName("pushbutton2")
        Win2.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win2)
        QtCore.QMetaObject.connectSlotsByName(Win2)

        self.pushbutton2.clicked.connect(self.openwin3)  # calling function

    def retranslateUi(self,Win2):
        _translate = QtCore.QCoreApplication.translate
        Win2.setWindowTitle(_translate("Win2","MainWindow"))
        self.pushbutton2.setText(_translate("Win2","Go to Win 3"))

    def openwin3(self):                   #Function for opening win3
        Win3 = QtWidgets.QMainWindow()
        ui = Ui_Win3()
        ui.setupUi(Win3)
        Win3.show()

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Win2 = QtWidgets.QMainWindow()
    ui = Ui_Win2()
    ui.setupUi(Win2)
    Win2.show()
    sys.exit(app.exec_())

Win3 

from PyQt5 import QtCore,QtWidgets

class Ui_Win3(object):
    def setupUi(self,Win3):
        Win3.setObjectName("Win3")
        Win3.resize(640,480)
        Win3.setStyleSheet("*{background:black;}")
        self.centralwidget = QtWidgets.QWidget(Win3)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(250,140,301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton3 = QtWidgets.QPushButton(self.frame)
        self.pushbutton3.setGeometry(QtCore.QRect(120,130,41))
        self.pushbutton3.setStyleSheet("background:white;")
        self.pushbutton3.setObjectName("pushbutton3")
        Win3.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win3)
        QtCore.QMetaObject.connectSlotsByName(Win3)

    def retranslateUi(self,Win3):
        _translate = QtCore.QCoreApplication.translate
        Win3.setWindowTitle(_translate("Win3","MainWindow"))
        self.pushbutton3.setText(_translate("Win3","Close and Relaunch"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Win3 = QtWidgets.QMainWindow()
    ui = Ui_Win3()
    ui.setupUi(Win3)
    Win3.show()
    sys.exit(app.exec_())

解决方法

请勿修改Qt Designer生成的代码，而是创建另一个继承的类 从适当的小部件中添加并使用初始类填充它。

win_1.py 

from PyQt5 import QtCore,QtGui,QtWidgets
from win_2 import Ui_Win2                                              # +++
from win_3 import Ui_Win3                                              # +++


class Ui_Win1(object):
    def setupUi(self,Win1):
        Win1.setObjectName("Win1")
        Win1.resize(640,480)
        Win1.setStyleSheet("*{background:black;}")
        self.centralwidget = QtWidgets.QWidget(Win1)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(110,70,361,301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton1 = QtWidgets.QPushButton(self.frame)
        self.pushbutton1.setGeometry(QtCore.QRect(120,120,131,41))
        self.pushbutton1.setStyleSheet("background:white;")
        self.pushbutton1.setObjectName("pushbutton1")
        Win1.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win1)
        QtCore.QMetaObject.connectSlotsByName(Win1)

    def retranslateUi(self,Win1):
        _translate = QtCore.QCoreApplication.translate
        Win1.setWindowTitle(_translate("Win1","MainWindow"))
        self.pushbutton1.setText(_translate("Win1","Go to Win 2"))


class Win3(QtWidgets.QMainWindow,Ui_Win3):
    def __init__(self,parent=None):
        super(Win3,self).__init__(parent)
        self.parent = parent
        self.setupUi(self)
        self.setWindowTitle("Win3")
        self.pushbutton3.clicked.connect(self.openwin1)
        
    def openwin1(self):                           # +++ Function for opening win1
        self.parent.show()
        self.hide()        
        

class Win2(QtWidgets.QMainWindow,Ui_Win2):
    def __init__(self,parent=None):
        super(Win2,self).__init__(parent)
        self.parent = parent
        self.setupUi(self)
        self.setWindowTitle("Win2")
        self.pushbutton2.clicked.connect(self.openwin3)  # calling function
        
    def openwin3(self):                          # Function for opening win3
        self.win3 = Win3(self.parent)
        self.win3.show()        
        self.hide()
        

class Win1(QtWidgets.QMainWindow,Ui_Win1):
    def __init__(self):
        super().__init__()
        
        self.setupUi(self)
        self.setWindowTitle("Win1")
        self.pushbutton1.clicked.connect(self.openwin2)  # +++ calling function

    def openwin2(self):                   # Function for opening win2
        self.win2 = Win2(self)
        self.win2.show()
        self.hide()
        

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    win1 = Win1()
    win1.show()
    sys.exit(app.exec_())

win_2.py 

from PyQt5 import QtCore,QtWidgets


class Ui_Win2(object):
    def setupUi(self,Win2):
        Win2.setObjectName("Win2")
        Win2.resize(640,480)
        Win2.setStyleSheet("*{background:black;}")
        self.centralwidget = QtWidgets.QWidget(Win2)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(10,20,301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton2 = QtWidgets.QPushButton(self.frame)
        self.pushbutton2.setGeometry(QtCore.QRect(120,41))
        self.pushbutton2.setStyleSheet("background:white;")
        self.pushbutton2.setObjectName("pushbutton2")
        Win2.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win2)
        QtCore.QMetaObject.connectSlotsByName(Win2)

    def retranslateUi(self,Win2):
        _translate = QtCore.QCoreApplication.translate
        Win2.setWindowTitle(_translate("Win2","MainWindow"))
        self.pushbutton2.setText(_translate("Win2","Go to Win 3"))

win_3.py 

from PyQt5 import QtCore,QtWidgets


class Ui_Win3(object):
    def setupUi(self,Win3):
        Win3.setObjectName("Win3")
        Win3.resize(640,480)
        Win3.setStyleSheet("*{background:black;}")
        self.centralwidget = QtWidgets.QWidget(Win3)
        self.centralwidget.setObjectName("centralwidget")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(250,140,301))
        self.frame.setStyleSheet("border: 2px solid white ;\n")
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.pushbutton3 = QtWidgets.QPushButton(self.frame)
        self.pushbutton3.setGeometry(QtCore.QRect(120,130,41))
        self.pushbutton3.setStyleSheet("background:white;")
        self.pushbutton3.setObjectName("pushbutton3")
        Win3.setCentralWidget(self.centralwidget)

        self.retranslateUi(Win3)
        QtCore.QMetaObject.connectSlotsByName(Win3)

    def retranslateUi(self,Win3):
        _translate = QtCore.QCoreApplication.translate
        Win3.setWindowTitle(_translate("Win3","MainWindow"))
        self.pushbutton3.setText(_translate("Win3","Close and Relaunch"))

enter image description here

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