QtCore.signal什么也不做

Question

我是PyQt5的初学者，很难使用QtCore.signal

当我按下按钮并切换当前显示的小部件时，我想发送一个信号。我在运行代码时没有任何错误，但是当我按下按钮时，什么都不会发生，我想这是因为我对QtCore.Signal做了一些错误

这是我的代码：

from PySide2 import QtCore, QtWidgets
from ui_Page_accueil import Ui_MainWindow
from ui_NouvelleVerif import Ui_Dialog as Ui_NouvelleVerif
from ui_NouvelleVerifEssieux import Ui_Dialog as Ui_NouvelleVerifEssieux
import sys


class MainWindowUi(Ui_MainWindow):

    to_NouvelleVerif = QtCore.Signal()

    def __init__(self):
        QtWidgets.QMainWindow.__init__(self)
        self.setupUi(self)

        #self.pushButton.clicked.connect(self.pushbutton_handler1)
        self.pushButton_2.clicked.connect(self.pushbutton_handler2)
        


    #def pushbutton_handler1(self):
    #    self.to_MainWindow.emit()

    def pushbutton_handler2(self):
        self.to_NouvelleVerif.emit()
        
 
    
class NouvelleVerifUi(QtWidgets.QWidget, Ui_NouvelleVerif):

    to_MainWindow = QtCore.Signal()
    to_NouvelleVerifEssieux = QtCore.Signal()

    def __init__(self):
        QtWidgets.QWidget.__init__(self)
        self.setupUi(self)

        self.pushButton.clicked.connect(self.pushbutton_handler1)
        #self.pushButton_2.clicked.connect(self.pushbutton_handler2)
        self.pushButton_3.clicked.connect(self.pushbutton_handler3)


    def pushbutton_handler1(self):
        self.to_MainWindow.emit()

    #def pushbutton_handler2(self):
    #    self.switch_window.emit()

    def pushbutton_handler3(self):
        self.to_NouvelleVerifEssieux.emit()
        


class NouvelleVerifEssieuxUi(QtWidgets.QWidget, Ui_NouvelleVerifEssieux):

    to_NouvelleVerif = QtCore.Signal()

    def __init__(self):
        QtWidgets.QWidget.__init__(self)
        self.setupUi(self)

        self.pushButton.clicked.connect(self.pushbutton_handler1)


    def pushbutton_handler1(self):
        self.to_NouvelleVerif.emit()


class Controller :
    app = QtWidgets.QApplication(sys.argv)
    widget = QtWidgets.QStackedWidget()
    MainWindow = MainWindowUi()
    NouvelleVerif = NouvelleVerifUi() 
    NouvelleVerifEssieux = NouvelleVerifEssieuxUi()     


    
        
    

    def __init__(self):
        
        self.widget.addWidget(self.MainWindow)   # create an instance of the first page class and add it to stackedwidget
        self.widget.addWidget(self.NouvelleVerif)   # adding second page   
        self.widget.addWidget(self.NouvelleVerifEssieux)
        self.widget.setCurrentWidget(self.MainWindow)   # setting the page that you want to load when application starts up. you can also use setCurrentIndex(int)

        


    def show_MainWindow(self):
        self.NouvelleVerif = NouvelleVerifUi()
        
        self.NouvelleVerif.to_MainWindow.connect(self.show_MainWindow)
        
        self.widget.setCurrentWidget(self.MainWindow)

    def show_NouvelleVerif(self):
        self.MainWindow = MainWindowUi()
        self.NouvelleVerifEssieux = NouvelleVerifEssieuxUi()
        
        self.MainWindow.to_NouvelleVerif.connect(self.show_NouvelleVerif)
        self.NouvelleVerifEssieux.to_NouvelleVerif.connect(self.show_NouvelleVerif)

        self.widget.setCurrentWidget(self.NouvelleVerif)
        
    def show_NouvelleVerifEssieux(self):
        self.NouvelleVerif = NouvelleVerifUi()

        self.NouvelleVerif.to_NouvelleVerifEssieux.connect(self.show_NouvelleVerifEssieux)

        self.widget.setCurrentWidget(self.NouvelleVerifEssieux)
    
            

def main():
     
    controller = Controller()
    controller.widget.show()
    sys.exit(controller.app.exec_())

if __name__ == '__main__':
    main()

Answer 1

@musicamante我不知道为什么我认为QtCore.Signal可以被调用，即使他在一个没有被调用的函数中。我照你说的做了，我意识到我在小部件上又犯了一个错误。

在控制器类中，它们被创建并添加到QStackedWidget中的__init__中，但是我创建了新的类，并试图将它们设置为CurrentWidget，而不将它们添加到QStackedWidget中。

@alexpdev我想以这样的方式浏览我在pushButton UI中的三个不同之处：

从MainWindowUI开始

MainWindowUI pushButton_2.clicked --> set the current widget display to NouvelleVerifUI

NouvelleVerifUI pushButton_1.clicked --> set the current widget display back to MainWindowUI 

NouvelleVerifUI pushButton_3.clicked --> set the current widget display to NouvelleVerifEssieuxUI  

NouvelleVerifEssieuxUI pushButton_1.clicked --> set the current widget display back to NouvelleVerifUI  

现在一切都正常了，我做了你说的@musicamante，我还使用了最初创建的UI。

class Controller :
    app = QtWidgets.QApplication(sys.argv)
    widget = QtWidgets.QStackedWidget()
    MainWindow = MainWindowUi()
    NouvelleVerif = NouvelleVerifUi() 
    NouvelleVerifEssieux = NouvelleVerifEssieuxUi()        
 
    def __init__(self):
        
        self.widget.addWidget(self.MainWindow)   # create an instance of the first page class and add it to stackedwidget
        self.widget.addWidget(self.NouvelleVerif)   # adding second page   
        self.widget.addWidget(self.NouvelleVerifEssieux)
        self.widget.setCurrentWidget(self.MainWindow)   # setting the page that you want to load when application starts up. you can also use setCurrentIndex(int)
        
        
        self.NouvelleVerif.to_MainWindow.connect(self.show_MainWindow)
        self.MainWindow.to_NouvelleVerif.connect(self.show_NouvelleVerif)
        self.NouvelleVerifEssieux.to_NouvelleVerif.connect(self.show_NouvelleVerif)
        self.NouvelleVerif.to_NouvelleVerifEssieux.connect(self.show_NouvelleVerifEssieux)

    def show_MainWindow(self):
        self.widget.setCurrentWidget(self.MainWindow)

    def show_NouvelleVerif(self):
        self.widget.setCurrentWidget(self.NouvelleVerif)
        
    def show_NouvelleVerifEssieux(self):
        self.widget.setCurrentWidget(self.NouvelleVerifEssieux)

谢谢大家抽出时间