PyQt加载UI文件

1.动态加载

import sys
from PySide6 import QtCore,QtWidgets
from PySide6.QtWidgets import *
from PySide6.QtUiTools import QUiLoader


class readfile(QWidget):
    def __init__(self):
        super().__init__()
        self.ui=QUiLoader().load("test.ui",self)       
        self.__create_connections()

    def __create_connections(self):              
        self.ui.pushButton.clicked.connect(self.open_file)        


    def open_file(self):        
        fname,_ = QFileDialog.getOpenFileName(self,"打开文件", '.')
        if fname:            
            self.ui.lineEdit.setText(fname)            
            with open(fname,'r') as f:
            	content = f.read()
            self.ui.textBrowser.setText(str(content))     
if __name__ == '__main__':
	#QApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
	#QApplication.setAttribute(Qt.AA_ShareOpenGLContexts)
	app = QApplication(sys.argv)
	w = readfile()
	w.show()       
	sys.exit(app.exec())

2.使用QFile加载

import sys
from PySide6 import QtCore,QtWidgets
from PySide6.QtWidgets import *
from PySide6.QtCore import QFile
from PySide6.QtUiTools import QUiLoader


class readfile(QWidget):
    def __init__(self):
        super().__init__()
        qfile=QFile("test.ui")
        qfile.open(QFile.ReadOnly)
        qfile.close()
        self.ui=QUiLoader().load(qfile,self)      
        self.__create_connections()

    def __create_connections(self):              
        self.ui.pushButton.clicked.connect(self.open_file)        


    def open_file(self):        
        fname,_ = QFileDialog.getOpenFileName(self,"打开文件", '.')
        if fname:            
            self.ui.lineEdit.setText(fname)            
            with open(fname,'r') as f:
            	content = f.read()
            self.ui.textBrowser.setText(str(content))     
if __name__ == '__main__':
	#QApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
	#QApplication.setAttribute(Qt.AA_ShareOpenGLContexts)
	app = QApplication(sys.argv)
	w = readfile()
	w.show()       
	sys.exit(app.exec())

动态加载出有错误信息，但不影响运行
错误信息如下：

qt.pysideplugin: Environment variable PYSIDE_DESIGNER_PLUGINS is not set, bailing out.
qt.pysideplugin: No instance of QPyDesignerCustomWidgetCollection was found.
Qt WebEngine seems to be initialized from a plugin. Please set Qt::AA_ShareOpenGLContexts using QCoreApplication::setAttribute and QSGRendererInterface::OpenGLRhi using QQuickWindow::setGraphicsApi before constructing QGuiApplication.