使用 Qt Designer 在 PySide2 中实现信号/插槽时出错

Posted 2023-02-16

【中文标题】使用 Qt Designer 在 PySide2 中实现信号/插槽时出错

【英文标题】：Error while implementing signal/slots in PySide2 using Qt Designer

【发布时间】：2019-08-11 12:42:39

【问题描述】：

我使用 Qt Designer 设计了一个用户界面，并使用信号/槽编辑器添加了信号/槽。我的 UI 中有按钮，信号是 clicked()，插槽是 click()。 pushButton 是我使用 QT Designer 创建的一个小部件。使用 python 3.7 和 QT Designer 5.12

QT Designer 自动生成以下代码：

from PySide2 import QtCore, QtGui, QtWidgets

class Ui_mainWindow(object):
    def setupUi(self, mainWindow):
       mainWindow.setObjectName("mainWindow")
       self.pushButton = QtWidgets.QPushButton(self.frame_1)
       self.pushButton.setObjectName("pushButton")
       QtCore.QObject.connect(self.pushButton, QtCore.SIGNAL("clicked()"), self.pushButton.click)
       QtCore.QMetaObject.connectSlotsByName(mainWindow)

我在class UI_mainWindow() 内添加了以下代码，用于执行pushbutton.click 功能。但我得到错误。请帮我解决这个问题。我需要在我的代码中添加按钮单击功能

class pushButton():
        def click(self):
            print("Button is clicked")  

QT Designer生成的.ui文件：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QPushButton" name="pushButton">
    <property name="geometry">
     <rect>
      <x>20</x>
      <y>20</y>
      <width>56</width>
      <height>17</height>
     </rect>
    </property>
    <property name="text">
     <string>PushButton</string>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>18</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>pushButton</sender>
   <signal>clicked()</signal>
   <receiver>pushButton</receiver>
   <slot>click()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>107</x>
     <y>76</y>
    </hint>
    <hint type="destinationlabel">
     <x>107</x>
     <y>76</y>
    </hint>
   </hints>
  </connection>
 </connections>
</ui>

错误：

进程以退出代码 -1073741571 (0xC00000FD) 结束

【参考方案1】：

使用您的初始逻辑，您正在创建一个无限循环，因为如果您发出 clicked 信号，例如通过根据您的逻辑按下按钮，同样按钮的 click() 方法也将被调用，该方法也会发出 clicked 信号将回调同一个按钮的 click() 方法等，永远不会结束。

相反，将 clicked 信号连接到窗口：

获取以下 .ui：

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>600</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QPushButton" name="pushButton">
    <property name="geometry">
     <rect>
      <x>20</x>
      <y>20</y>
      <width>56</width>
      <height>17</height>
     </rect>
    </property>
    <property name="text">
     <string>PushButton</string>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>23</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>pushButton</sender>
   <signal>clicked()</signal>
   <receiver>MainWindow</receiver>
   <slot>click()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>52</x>
     <y>59</y>
    </hint>
    <hint type="destinationlabel">
     <x>283</x>
     <y>201</y>
    </hint>
   </hints>
  </connection>
 </connections>
 <slots>
  <slot>click()</slot>
 </slots>
</ui>

您必须使用以下命令转换为 .py：

pyside2-uic design.ui -o design.py -x

设计.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'design.ui',
# licensing of 'design.ui' applies.
#
# Created: Sun Aug 11 08:07:08 2019
#      by: pyside2-uic  running on PySide2 5.13.0
#
# WARNING! All changes made in this file will be lost!

from PySide2 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(20, 20, 56, 17))
        self.pushButton.setObjectName("pushButton")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
        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.QObject.connect(self.pushButton, QtCore.SIGNAL("clicked()"), MainWindow.click)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QtWidgets.QApplication.translate("MainWindow", "MainWindow", None, -1))
        self.pushButton.setText(QtWidgets.QApplication.translate("MainWindow", "PushButton", None, -1))


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

此外，如果您检查 .py，您会发现消息：WARNING! All changes made in this file will be lost!，因此不必在 design.py 中编写逻辑，您必须创建另一个实现逻辑的 .py 文件：

main.py

from PySide2 import QtCore, QtGui, QtWidgets

from design import Ui_MainWindow


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

    @QtCore.Slot()
    def click(self):
        print("Button is clicked")


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

├── design.py
└── main.py