隐藏后显示关闭按钮(x) (QTabBar)

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QTabWidget

class CustomTabWidget(QTabWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setTabsClosable(True)  # 显示关闭按钮
        self.tabCloseRequested.connect(self.tab_closed)

    def toggle_tab_close_button(self, show):
        self.setTabsClosable(show)

    def tab_closed(self, index):
        self.removeTab(index)

app = QApplication(sys.argv)
window = QMainWindow()
tab_widget = CustomTabWidget(window)
tab_widget.addTab(QPushButton("Tab 1 Content"), "Tab 1")
tab_widget.addTab(QPushButton("Tab 2 Content"), "Tab 2")

# 隐藏关闭按钮
tab_widget.toggle_tab_close_button(False)

window.setCentralWidget(tab_widget)
window.show()
sys.exit(app.exec_())