[英]PyQt5: Using QtDesigner, how do you connect a signal with a slot/callable defined in a module
我是PyQt5的初学者,请原谅我的无知
我正在尝试将按钮与我定义的功能连接
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_())
为了执行上述操作,我使用QtDesigner ..在主窗口中添加了一个插槽,如图所示,然后将按钮的Pressed信号与主窗口的插槽连接起来
当我尝试运行该应用程序时,出现此错误:
AttributeError:“ QMainWindow”对象没有属性“ PrintSomething”
我在这里做错了什么?
更新:
我也用过这段代码
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生成了自动模块,并添加了函数PrintSomething()。 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")
您需要像这样重组代码:
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,我认为连接代码中的信号比通过Qt Designer完成所有操作更好:
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,或者想将按钮连接到其他插槽,则通过Qt Designer更改它会很麻烦。 在开发应用程序时,信号连接可能会经常更改,因此手动编码可能更易于管理。
编辑 :
可以以类似的方式解决添加到问题的另一个示例。 但是,如果要使用pyuic
,则永远不要编辑它生成的模块。 相反,您应该像这样简单地将其导入到主脚本中:
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_())
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