在QTdesigner界面中使用按钮切换pyqtgraph画图

在Qt Designer中先建立UI，转成py文件，文件名为：plot_ui.py

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

################################################################################
## Form generated from reading UI file 'designerfVqEfi.ui'
##
## Created by: Qt User Interface Compiler version 6.3.0
##
## WARNING! All changes made in this file will be lost when recompiling UI file!
################################################################################

from PySide6.QtCore import (QCoreApplication, QDate, QDateTime, QLocale,
    QMetaObject, QObject, QPoint, QRect,
    QSize, QTime, QUrl, Qt)
from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
    QFont, QFontDatabase, QGradient, QIcon,
    QImage, QKeySequence, QLinearGradient, QPainter,
    QPalette, QPixmap, QRadialGradient, QTransform)
from PySide6.QtWidgets import (QApplication, QFormLayout, QMainWindow, QMenuBar,
    QPushButton, QSizePolicy, QStatusBar, QWidget)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        if not MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.formLayoutWidget = QWidget(self.centralwidget)
        self.formLayoutWidget.setObjectName(u"formLayoutWidget")
        self.formLayoutWidget.setGeometry(QRect(50, 30, 381, 201))
        self.formLayout = QFormLayout(self.formLayoutWidget)
        self.formLayout.setObjectName(u"formLayout")
        self.formLayout.setContentsMargins(0, 0, 0, 0)
        self.sinbtn = QPushButton(self.centralwidget)
        self.sinbtn.setObjectName(u"sinbtn")
        self.sinbtn.setGeometry(QRect(110, 260, 80, 25))
        self.cosbtn = QPushButton(self.centralwidget)
        self.cosbtn.setObjectName(u"cosbtn")
        self.cosbtn.setGeometry(QRect(260, 260, 80, 25))
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QMenuBar(MainWindow)
        self.menubar.setObjectName(u"menubar")
        self.menubar.setGeometry(QRect(0, 0, 800, 22))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QStatusBar(MainWindow)
        self.statusbar.setObjectName(u"statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)

        QMetaObject.connectSlotsByName(MainWindow)
    # setupUi

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
        self.sinbtn.setText(QCoreApplication.translate("MainWindow", u"PushButton", None))
        self.cosbtn.setText(QCoreApplication.translate("MainWindow", u"PushButton", None))
    # retranslateUi

 再创建一个文件，使用PySide6来演示Ui

from PySide6.QtWidgets import QApplication, QMainWindow,QWidget
import pyqtgraph as pg
import sys
from PySide6 import QtCore,QtWidgets
import numpy as np
from plot_ui import Ui_MainWindow

class pgplot(QMainWindow):

    def __init__(self):
        super().__init__()
        self.ui = Ui_MainWindow()  
        self.ui.setupUi(self) 
        self.__create_connections()
        

    def __create_connections(self):
        self.ui.sinbtn.clicked.connect(self.__plotsin)
        self.ui.cosbtn.clicked.connect(self.__plotcos)

    def __clear_item(self):# 清除图像
        item_list = list(range(self.ui.formLayout.count()))
        for i in item_list:
            item = self.ui.formLayout.itemAt(i)
            self.ui.formLayout.removeItem(item)
            # if item.widget():
            #     item.widget().deleteLater()
    

    def __plotsin(self):
        self.__clear_item()
        plt= pg.plot()
        plt.setBackground('w')
        pen = pg.mkPen(color='#ff0000',width = 2,style = QtCore.Qt.DashLine)
        x = np.arange(0,160)
        y = np.sin(x*0.1)
        line1 = plt.plot(x,y,pen=pen)                
        self.ui.formLayout.addWidget(plt)

    def __plotcos(self):
        self.__clear_item()
        plt= pg.plot()
        plt.setBackground('w')
        pen = pg.mkPen(color='g',width = 2,style = QtCore.Qt.DashDotDotLine)
        x = np.arange(0,100)
        z = np.cos(x*0.1)
        line2 = plt.plot(x,z,pen=pen)
        self.ui.formLayout.addWidget(plt)



if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = pgplot()
    w.show()
    app.exec()