问题
I've created a simple GUI using qt designer and imported it into my python project. The main window comes up, and the menus/buttons are responsive, but I cannot manage to connect my QActions to custom functions (I did it for buttons though, and it works). The weird thing is that my custom function (on_action_clicked) is called once when I run the application, but not when I click on the menu items or icons of the toolbar (I tried connecting both). Below are the test codes. Am I missing something?
imbrowser3d.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>851</width>
<height>649</height>
</rect>
</property>
<property name="windowTitle">
<string>MainWindow</string>
</property>
<widget class="QWidget" name="centralwidget">
<widget class="QGraphicsView" name="gv_image">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>731</width>
<height>501</height>
</rect>
</property>
</widget>
<widget class="QScrollBar" name="sb_index">
<property name="geometry">
<rect>
<x>0</x>
<y>510</y>
<width>701</width>
<height>20</height>
</rect>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
</widget>
<widget class="QScrollBar" name="sb_zeta">
<property name="geometry">
<rect>
<x>0</x>
<y>530</y>
<width>701</width>
<height>20</height>
</rect>
</property>
<property name="orientation">
<enum>Qt::Horizontal</enum>
</property>
</widget>
<widget class="QLabel" name="label_index">
<property name="geometry">
<rect>
<x>700</x>
<y>510</y>
<width>55</width>
<height>16</height>
</rect>
</property>
<property name="text">
<string>index</string>
</property>
</widget>
<widget class="QLabel" name="label_zeta">
<property name="geometry">
<rect>
<x>700</x>
<y>530</y>
<width>55</width>
<height>16</height>
</rect>
</property>
<property name="text">
<string>zeta</string>
</property>
</widget>
<widget class="QPushButton" name="pushButton">
<property name="geometry">
<rect>
<x>740</x>
<y>500</y>
<width>93</width>
<height>28</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>851</width>
<height>26</height>
</rect>
</property>
<widget class="QMenu" name="menuFile">
<property name="title">
<string>File</string>
</property>
<addaction name="menu_open"/>
<addaction name="menu_save"/>
<addaction name="menu_load"/>
</widget>
<addaction name="menuFile"/>
</widget>
<widget class="QStatusBar" name="statusbar"/>
<widget class="QToolBar" name="action_toolbar">
<property name="windowTitle">
<string>toolBar</string>
</property>
<attribute name="toolBarArea">
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak">
<bool>false</bool>
</attribute>
<addaction name="action_save_state"/>
</widget>
<action name="menu_open">
<property name="text">
<string>Open</string>
</property>
</action>
<action name="menu_save">
<property name="icon">
<iconset>
<normaloff>ui_icons/save_icon.png</normaloff>ui_icons/save_icon.png</iconset>
</property>
<property name="text">
<string>Save state</string>
</property>
</action>
<action name="menu_load">
<property name="text">
<string>Load state</string>
</property>
</action>
<action name="action_save_state">
<property name="icon">
<iconset>
<normaloff>ui_icons/save_icon.png</normaloff>ui_icons/save_icon.png</iconset>
</property>
<property name="text">
<string>Save state</string>
</property>
<property name="toolTip">
<string>Save state</string>
</property>
</action>
</widget>
<resources/>
<connections/>
</ui>
main.py
import sys
from PySide2.QtUiTools import QUiLoader
from PySide2.QtWidgets import QApplication, QAction, QPushButton, QFileDialog
from PySide2.QtCore import QFile, QObject
class UiMainWindow(QObject):
def __init__(self, ui_file, parent=None):
super(UiMainWindow, self).__init__(parent)
ui_file = QFile(ui_file)
ui_file.open(QFile.ReadOnly)
loader = QUiLoader()
self.window = loader.load(ui_file)
ui_file.close()
self.btn = self.window.findChild(QPushButton, 'pushButton')
self.btn.clicked.connect(self.on_btn_clicked)
self.action_save = self.window.findChild(QAction, 'action_save_state')
self.action_save.triggered.connect(self.on_action_clicked('action clicked'))
self.window.show()
def on_action_clicked(self, txt):
print(txt)
def on_btn_clicked():
print('button clicked')
if __name__ == '__main__':
app = QApplication(sys.argv)
form = UiMainWindow('imbrowser3d.ui')
sys.exit(app.exec_())
回答1:
You have 2 errors:
on_btn_clicked is a method of the class so it must have as the first parameter the instance, that is, self.
the connection is with the name of the function without evaluating, in your case the slot on_action_clicked you are evaluating it, so you are getting it printed at the beginning, for it there are 2 possible solutions: use partial or use a lambda function.
self.btn = self.window.findChild(QPushButton, 'pushButton')
self.btn.clicked.connect(self.on_btn_clicked)
self.action_save = self.window.findChild(QAction, 'action_save_state')
self.action_save.triggered.connect(partial(self.on_action_clicked, 'action clicked'))
# self.action_save.triggered.connect(lambda: self.on_action_clicked('action clicked')) # use lambda function
self.window.show()
def on_action_clicked(self, txt):
print(txt)
def on_btn_clicked(self):
print('button clicked')
来源：https://stackoverflow.com/questions/52163305/pyside2-qaction-triggers-once-automatically-but-not-when-user-clicks-the-menu