pyqt5 菜单栏单选

在PyQt5中，可以使用QActionGroup类来实现菜单栏的单选功能。下面是一个示例代码：

from PyQt5.QtWidgets import QMainWindow, QApplication, QAction, QMenu, QActionGroup
import sys

class MenuBarDemo(QMainWindow):
    def __init__(self):
        super(MenuBarDemo, self).__init__()

        bar = self.menuBar()
        file = bar.addMenu("选择")
        group = QActionGroup(self)

        action1 = QAction("选项1", self)
        action1.setCheckable(True)
        action1.setChecked(True)
        action1.triggered.connect(self.actionTriggered)

        action2 = QAction("选项2", self)
        action2.setCheckable(True)
        action2.triggered.connect(self.actionTriggered)

        action3 = QAction("选项3", self)
        action3.setCheckable(True)
        action3.triggered.connect(self.actionTriggered)

        group.addAction(action1)
        group.addAction(action2)
        group.addAction(action3)

        file.addAction(action1)
        file.addAction(action2)
        file.addAction(action3)

    def actionTriggered(self):
        action = self.sender()
        print("选中了：", action.text())

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

在这个示例中，我们创建了一个菜单栏，并向其添加了一个"选择"的菜单项。然后，我们创建了一个QActionGroup对象，用于管理菜单项的单选功能。

接着，我们创建了三个QAction对象，并将它们添加到QActionGroup中。然后，我们将这些QAction对象添加到"选择"菜单中。

当用户选中某个菜单项时，会触发actionTriggered槽函数，并打印出选中的菜单项的文本。

这样，我们就实现了菜单栏的单选功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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