如何在我的PyQt5 Qwidget上显示matplotlib

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 MyMplCanvas(FigureCanvas):
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        super(MyMplCanvas, self).__init__(fig)

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setWindowTitle("Matplotlib in PyQt5")
        
        # 创建一个QWidget对象
        self.central_widget = QWidget(self)
        self.setCentralWidget(self.central_widget)
        
        # 创建一个垂直布局
        self.v_layout = QVBoxLayout(self.central_widget)
        
        # 创建一个自定义的Matplotlib QWidget对象
        self.mpl_canvas = MyMplCanvas(self.central_widget, width=5, height=4, dpi=100)
        
        # 将Matplotlib QWidget添加到垂直布局中
        self.v_layout.addWidget(self.mpl_canvas)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())