Question

我是第一次使用pyqt5。从QT设计器创建UI，然后将UI文件转换为python文件后，我遇到了错误，奇怪的是，有时当我尝试从Designer重新创建UI时我没有收到错误，但是有时代码一行一行，我得到这个错误。也许我在qt设计器中做错了什么，我不知道有什么问题。

QObject :: connect：无法将QPushButton :: clicked（bool）连接到（null）:: browse_slot（）

TypeError：在clicked（bool）和Browse_slot（）之间connect（）失败

我的代码：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(280, 200, 89, 25))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 22))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.retranslateUi(MainWindow)
        self.pushButton.clicked.connect(self.browse_slot)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))

    @QtCore.pyqtSlot( )
    def browse_slot( self ):
        options = QtWidgets.QFileDialog.Options()
        options |= QtWidgets.QFileDialog.DontUseNativeDialog
        fileName, _ = QtWidgets.QFileDialog.getOpenFileName(
                        None,
                        "QFileDialog.getOpenFileName()",
                        "",
                        "All Files (*);;Python Files (*.py)",
                        options=options)
        if fileName:
            self.debugPrint( "setting file name: " + fileName )
            self.model.setFileName( fileName )
            self.refreshAll()

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

Answer 1

如果要使用@ QtCore.pyqtSlot（）建立连接，则必须在从QObject继承的类中使用它，另一方面，the PyQt docs表示建议您创建一个继承的类从适当的小部件（在本例中为QMainWindow）中，并且您将该类用作接口，这也解决了第一点，因为QMainWindow继承自QObject。

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(280, 200, 89, 25))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 22))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        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", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.browse_slot)

    @QtCore.pyqtSlot()
    def browse_slot(self):
        options = QtWidgets.QFileDialog.Options()
        options |= QtWidgets.QFileDialog.DontUseNativeDialog
        fileName, _ = QtWidgets.QFileDialog.getOpenFileName(
                        None,
                        "QFileDialog.getOpenFileName()",
                        "",
                        "All Files (*);;Python Files (*.py)",
                        options=options)
        if fileName:
            self.debugPrint( "setting file name: " + fileName )
            self.model.setFileName( fileName )
            self.refreshAll()

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

Answer 2

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):

更改为

class Ui_MainWindow(Qobject):
    def setupUi(self, MainWindow):

连接按钮时，我在pyqt5中遇到错误

2 个答案: