在PyQT5的分组框中显示matplotlib图表

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

class App(QMainWindow):
    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 with Matplotlib'
        self.left = 100
        self.top = 100
        self.width = 640
        self.height = 400
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        # 创建分组框
        groupBox = QGroupBox('Matplotlib Chart')
        layout = QVBoxLayout(groupBox)

        # 创建Matplotlib图表
        fig = Figure()
        ax = fig.add_subplot(111)
        t = np.arange(0.0, 3.0, 0.01)
        s = np.sin(2 * np.pi * t)
        ax.plot(t, s)

        # 创建FigureCanvas对象
        canvas = FigureCanvas(fig)
        layout.addWidget(canvas)

        # 设置主窗口的中心部件
        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)

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