QDockWidget

去除顶部边框

    titleBar = QWidget()
    # 去除顶部边框
    # 新建一个空的QWidget，然后填充进顶部
    ui.dockWidget.setTitleBarWidget(titleBar)

实例

# -*- coding: utf-8 -*-
from PyQt5 import QtCore, QtGui, QtWidgets
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.horizontalLayout = QtWidgets.QHBoxLayout(self.centralwidget)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.groupBox = QtWidgets.QGroupBox(self.centralwidget)
        self.groupBox.setObjectName("groupBox")
        self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.groupBox)
        self.verticalLayout_2.setObjectName("verticalLayout_2")
        self.textBrowser = QtWidgets.QTextBrowser(self.groupBox)
        self.textBrowser.setObjectName("textBrowser")
        self.verticalLayout_2.addWidget(self.textBrowser)
        self.dateTimeEdit = QtWidgets.QDateTimeEdit(self.groupBox)
        self.dateTimeEdit.setObjectName("dateTimeEdit")
        self.verticalLayout_2.addWidget(self.dateTimeEdit)
        self.timeEdit = QtWidgets.QTimeEdit(self.groupBox)
        self.timeEdit.setObjectName("timeEdit")
        self.verticalLayout_2.addWidget(self.timeEdit)
        self.lineEdit = QtWidgets.QLineEdit(self.groupBox)
        self.lineEdit.setObjectName("lineEdit")
        self.verticalLayout_2.addWidget(self.lineEdit)
        self.horizontalLayout.addWidget(self.groupBox)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.dockWidget = QtWidgets.QDockWidget(MainWindow)
        self.dockWidget.setAllowedAreas(QtCore.Qt.AllDockWidgetAreas)
        self.dockWidget.setObjectName("dockWidget")
        self.dockWidgetContents = QtWidgets.QWidget()
        self.dockWidgetContents.setObjectName("dockWidgetContents")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.dockWidgetContents)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.tabWidget = QtWidgets.QTabWidget(self.dockWidgetContents)
        self.tabWidget.setObjectName("tabWidget")
        self.tab = QtWidgets.QWidget()
        self.tab.setObjectName("tab")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.tab)
        self.verticalLayout.setObjectName("verticalLayout")
        self.calendarWidget = QtWidgets.QCalendarWidget(self.tab)
        self.calendarWidget.setObjectName("calendarWidget")
        self.verticalLayout.addWidget(self.calendarWidget)
        self.progressBar = QtWidgets.QProgressBar(self.tab)
        self.progressBar.setProperty("value", 24)
        self.progressBar.setObjectName("progressBar")
        self.verticalLayout.addWidget(self.progressBar)
        self.tabWidget.addTab(self.tab, "")
        self.tab_2 = QtWidgets.QWidget()
        self.tab_2.setObjectName("tab_2")
        self.tabWidget.addTab(self.tab_2, "")
        self.horizontalLayout_2.addWidget(self.tabWidget)
        self.dockWidget.setWidget(self.dockWidgetContents)
        # self.dockWidget.setTitleBarWidget(QWidget())
        MainWindow.addDockWidget(QtCore.Qt.DockWidgetArea(2), self.dockWidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.groupBox.setTitle(_translate("MainWindow", "GroupBox"))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab), _translate("MainWindow", "Tab 1"))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2), _translate("MainWindow", "Tab 2"))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    MainWindow = QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    titleBar = QWidget()
    # 去除顶部边框
    # 新建一个空的QWidget，然后填充进顶部
    ui.dockWidget.setTitleBarWidget(titleBar)
    MainWindow.show()
    sys.exit(app.exec_())