Question

我是PyQt5的初学者，请原谅我的无知我正在尝试连接按钮和我定义的功能

import sys
from PyQt5 import QtGui, QtWidgets,uic


def PrintSomething ():
    print("Hello world")

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    window = uic.loadUi("Auto.ui")
    window.show()
    sys.exit(app.exec_())

为了做到这一点，我使用QtDesigner在MainWindow中添加了一个插槽..如图所示，然后我将按钮的按下信号与主窗口的插槽连接

当我尝试运行该应用时，我收到此错误：

AttributeError：'QMainWindow'对象没有属性'PrintSomething'

我在这里做错了什么？

更新：

我也使用过此代码

import sys
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from Auto import Ui_MainWindow
class MainW (QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.ui=Ui_MainWindow()
        self.ui.setupUi(self)
if __name__ == '__main__':
    #topology=topo.LoadTopology()
    app = QApplication(sys.argv)
    myapp = MainW()
    myapp.show()
    sys.exit(app.exec_())

通过pyuic5生成Auto模块并添加了PrintSomething（）函数。这也会导致错误

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(667, 487)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(300, 380, 95, 29))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 667, 23))
        self.menubar.setObjectName("menubar")
        self.menuFile = QtWidgets.QMenu(self.menubar)
        self.menuFile.setObjectName("menuFile")
        self.menuExit = QtWidgets.QMenu(self.menubar)
        self.menuExit.setObjectName("menuExit")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.actionOpen = QtWidgets.QAction(MainWindow)
        self.actionOpen.setObjectName("actionOpen")
        self.actionSave = QtWidgets.QAction(MainWindow)
        self.actionSave.setObjectName("actionSave")
        self.actionClose = QtWidgets.QAction(MainWindow)
        self.actionClose.setObjectName("actionClose")
        self.menuFile.addAction(self.actionOpen)
        self.menuFile.addAction(self.actionSave)
        self.menuFile.addAction(self.actionClose)
        self.menubar.addAction(self.menuFile.menuAction())
        self.menubar.addAction(self.menuExit.menuAction())

        self.retranslateUi(MainWindow)
        self.pushButton.pressed.connect(MainWindow.PrintSomething())
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))
        self.menuFile.setTitle(_translate("MainWindow", "File"))
        self.menuExit.setTitle(_translate("MainWindow", "Exit"))
        self.actionOpen.setText(_translate("MainWindow", "Open"))
        self.actionSave.setText(_translate("MainWindow", "Save"))
        self.actionClose.setText(_translate("MainWindow", "Close"))
    def PrintSomething ():
        print("Hello world")

Answer 1

您需要像这样重构代码：

import sys
from PyQt5 import QtGui, QtWidgets, uic

class Window(QtWidgets.QMainWindow):
    def __init__(self):
        super(Window, self).__init__()
        uic.loadUi("Auto.ui", self)

    def PrintSomething(self):
        print("Hello world")

if __name__ == '__main__':

    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

但是，我认为最好将代码中的信号连接起来，而不是通过Qt Designer完成所有操作：

class Window(QtWidgets.QMainWindow):
    def __init__(self):
        ...
        self.pushButton.clicked.connect(self.PrintSomething)

如果您更改了PrintSomething插槽的名称，或者想要将按钮连接到其他插槽，则通过Qt Designer进行更改会非常麻烦。在开发应用程序时，信号连接可能会经常发生变化，因此手动编码可能更易于管理。

修改：

添加到问题中的另一个示例可以以类似的方式修复。但是，如果您要使用pyuic，则永远不会编辑它生成的模块。相反，您应该将其导入主脚本，如下所示：

import sys from PyQt5.QtGui import * from PyQt5.QtWidgets import * from PyQt5.QtCore import * from Auto import Ui_MainWindow class MainW (QMainWindow, Ui_MainWindow): def __init__(self): QMainWindow.__init__(self) self.setupUi(self) self.pushButton.clicked.connect(self.PrintSomething) def PrintSomething(self): print("Hello world") if __name__ == '__main__': app = QApplication(sys.argv) myapp = MainW() myapp.show() sys.exit(app.exec_())

PyQt5：使用QtDesigner，如何将信号与模块中定义的槽/可调用信号连接起来

1 个答案: