将matplotlib小部件嵌入到python程序中QtDesigner生成的gui中

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QVBoxLayout, QWidget
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class MatplotlibWidget(QWidget):
    def __init__(self, parent=None):
        super(MatplotlibWidget, self).__init__(parent)
        self.figure = Figure()
        self.canvas = FigureCanvas(self.figure)
        layout = QVBoxLayout()
        layout.addWidget(self.canvas)
        self.setLayout(layout)

from PyQt5.uic import loadUi

class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        loadUi('your_ui_file.ui', self)  # 替换'your_ui_file.ui'为你的UI文件路径
        self.matplotlib_widget = MatplotlibWidget()
        self.your_qwidget_layout.addWidget(self.matplotlib_widget)  # 替换'your_qwidget_layout'为QWidget布局的名称

def plot_graph(self):
    ax = self.matplotlib_widget.figure.add_subplot(111)
    # 在这里使用matplotlib绘制你的图形
    ax.plot([1, 2, 3, 4], [1, 4, 9, 16])
    self.matplotlib_widget.canvas.draw()