PyQt5 消息框

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMessageBoxclass Example(QWidget):

    def __init__(self):
        super().__init__()
        self.initUI()
        
    def initUI(self):
        self.resize(250, 155)
        self.setWindowTitle(‘title‘)
        self.show()

    # 重写closeEvent()事件方法
    def closeEvent(self, event):
        # 显示消息框
        reply = QMessageBox.question(self, ‘Message‘, "Are you sure to quit?", QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()
    
if __name__ == ‘__main__‘:
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())