encabezado de barra de acoplamiento personalizado pyqt5

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *


class CustomDock(QDockWidget):
    def __init__(self, title: str, parent=None):
        super().__init__(title, parent)

        """停靠栏的头部"""
        h_layout = QHBoxLayout()
        h_layout.setContentsMargins(0, 7, 0, 7)
        h_layout.setSpacing(0)
        self.label = QLabel("知识点")
        self.btn_hide = QPushButton(QIcon("hide.jpg"), "", self)
        # self.btn_hide.setStyleSheet("background-color: #f0f0f0")
        h_layout.addWidget(self.label)
        # h_layout.addWidget(QLineEdit())
        h_layout.addWidget(self.btn_hide,alignment=Qt.AlignRight)

        title_bar_widget = QWidget()
        title_bar_widget.setLayout(h_layout)

        self.setTitleBarWidget(title_bar_widget)

        """停靠栏的内容"""
        self.title_list = QListWidget(self)
        self.title_list.addItems([str(i) for i in range(100)])
        self.setWidget(self.title_list)


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setCentralWidget(QTextEdit())
        dock = CustomDock("你好", self)
        self.addDockWidget(Qt.BottomDockWidgetArea, dock)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.setFont(QFont("Arial", 12))
    window.show()
    sys.exit(app.exec_())