PyQt5基本窗口控件-----QMessageBox

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QMessageBox常用的消息对话框有以下几类

• 关于对话框
• 错误对话框
• 警告对话框
• 询问对话框
• 消息对话框

关于差异

• 显示的对话框图标不同
• 显示的按钮不同

import sys
from PyQt5.QtWidgets import *

class QMessageBoxDemo(QWidget):
    def __init__(self):
        super(QMessageBoxDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('QMessageBox案例')
        self.resize(300, 400)

        layout = QVBoxLayout()

        # 关于对话框
        self.button1 = QPushButton()
        self.button1.setText('显示关于对话框')
        self.button1.clicked.connect(self.showDialog)

        # 显示消息对话框
        self.button2 = QPushButton()
        self.button2.setText('显示消息对话框')
        self.button2.clicked.connect(self.showDialog)

        # 显示警告对话框
        self.button3 = QPushButton()
        self.button3.setText('显示警告对话框')
        self.button3.clicked.connect(self.showDialog)

        # 显示错误对话框
        self.button4 = QPushButton()
        self.button4.setText('显示错误对话框')
        self.button4.clicked.connect(self.showDialog)

        # 显示询问对话框
        self.button5 = QPushButton()
        self.button5.setText('显示询问对话框')
        self.button5.clicked.connect(self.showDialog)

        layout.addWidget(self.button1)
        layout.addWidget(self.button2)
        layout.addWidget(self.button3)
        layout.addWidget(self.button4)
        layout.addWidget(self.button5)

        self.setLayout(layout)

    def showDialog(self):
        text = self.sender().text()
        if text == '显示关于对话框':
            QMessageBox.about(self, '关于', '这是一个关于对话框')
        elif text == '显示消息对话框':
            repaly = QMessageBox.information(self, '消息', '这是一个消息对话框', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
            print(repaly == QMessageBox.Yes)
        elif text == '显示警告对话框':
            QMessageBox.warning(self, '警告', '这是一个警告对话框', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
        elif text == '显示错误对话框':
            QMessageBox.critical(self, '警告', '这是一个错误对话框', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
        elif text == '显示询问对话框':
            QMessageBox.question(self, '警告', '这是一个询问对话框', QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)

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