PyQt5学习2-第一个对话框

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QMessageBox

QtWidgets提供了一些默认的消息框 QMessageBox, 主要有

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QMessageBox.question(self, 'message', 'Are you sure to quite?',QMessageBox.Yes, QMessageBox.No)
QMessageBox.about(self,'About this', 'This is a test program')
QMessageBox.warning(self,'warning','There is a warning',QMessageBox.Cancel)
QMessageBox.information(self,'Information', 'This is an information')
QMessageBox.critical(self, 'critical', 'error')

QMessageBox.question

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#!/usr/bin/python3
#-*- coding: utf-8 -*-
# shows message box when click close button
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMessageBox
class ex(QWidget):
    def __init__(self):
        super().__init__()
        self.show()
    def closeEvent(self,event):
        reply = QMessageBox.question(self,'Message',"Are you sure to quit?")
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = ex()
    sys.exit(app.exec_())

点击关闭按钮时，产生一个消息窗口如下

QMessageBox