使用PySide2.在Qt设计器中嵌入PyQtGraph

Question

我无法使用PySide2和一个.ui文件使PyQtGraph工作，因为我在Qt Designer中将QWidget升级为PlotWidget。当我使用PyQt5时，它工作得很好，但使用PySide2时，我得到以下消息：

Qt WebEngine seems to be initialized from a plugin. Please set Qt::AA_ShareOpenGLContexts using >QCoreApplication::setAttribute before constructing QGuiApplication.
"QFormBuilder was unable to create a custom widget of the class 'PlotWidget'; defaulting to base class 'QWidget'."
Traceback (most recent call last):
File "test_widget3.py", line 13, in <module>
window.graphWidget.plot([1,5,10], [1,2,7])
AttributeError: 'PySide2.QtWidgets.QWidget' object has no attribute 'plot'

代码：

import sys
from PySide2 import QtCore, QtGui, QtWidgets
from PySide2.QtUiTools import QUiLoader
from pyqtgraph import PlotWidget, plot
import pyqtgraph as pg
app = QtWidgets.QApplication(sys.argv)
loader = QUiLoader()
window = loader.load("pyqtgraph_window.ui")
window.graphWidget.plot([1,5,10], [1,2,7])
window.show()
app.exec_()

使用PyQt5(有效(：

import sys
from PyQt5 import QtWidgets, uic
from pyqtgraph import PlotWidget, plot
import pyqtgraph as pg
app = QtWidgets.QApplication(sys.argv)
window = uic.loadUi("pyqtgraph_window.ui")
window.graphWidget.plot([1,5,10], [1,2,7])
window.show()
app.exec_()

.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">
<layout class="QGridLayout" name="gridLayout">
<item row="0" column="0">
<widget class="PlotWidget" name="graphWidget" native="true"/>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menubar">
<property name="geometry">
<rect>
<x>0</x>
<y>0</y>
<width>800</width>
<height>21</height>
</rect>
</property>
</widget>
<widget class="QStatusBar" name="statusbar"/>
</widget>
<customwidgets>
<customwidget>
<class>PlotWidget</class>
<extends>QWidget</extends>
<header>pyqtgraph</header>
<container>1</container>
</customwidget>
</customwidgets>
<resources/>
<connections/>
</ui>

我使用Github和PySide2 v5.12的PyQtGraph的最后一个开发版本如果你能帮忙的话，谢谢你！

Answer 1

loadUi使用名称动态访问类，这个概念在C++中不存在，所以QUiLoader有这个限制，所以解决方案是指示转换显式覆盖createWidget方法：

import os
import sys
from PySide2 import QtCore, QtGui, QtWidgets, QtUiTools
import pyqtgraph as pg

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))

class UiLoader(QtUiTools.QUiLoader):
def createWidget(self, className, parent=None, name=""):
if className == "PlotWidget":
return pg.PlotWidget(parent=parent)
return super().createWidget(className, parent, name)

if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
loader = UiLoader()
window = loader.load(os.path.join(CURRENT_DIR, "pyqtgraph_window.ui"))
window.graphWidget.plot([1, 5, 10], [1, 2, 7])
window.show()
sys.exit(app.exec_())