PyQt: 练习 QMessageBox

import sys
from PyQt5.Qt import *


class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setup_ui()

    def setup_ui(self):
        self.setWindowTitle("Qt桌面应用程序")
        self.resize(300, 300)

        self.label = QLabel(self)
        self.label.setText("你好，世界！")

        self.message_box = QMessageBox(self)
        self.message_box.setWindowTitle("信息提示框")
        self.message_box.setIcon(QMessageBox.Information)
        self.message_box.setText("<h3>标题</h3>")
        self.message_box.setTextInteractionFlags(Qt.TextEditorInteraction)
        self.message_box.setInformativeText("内容")
        self.message_box.setDetailedText("详细内容")

        ok = self.message_box.addButton(QMessageBox.Ok)
        ignore = self.message_box.addButton(QMessageBox.Ignore)
        no = QPushButton("按钮NoRole", self.message_box)
        self.message_box.addButton(no, QMessageBox.NoRole)
        self.message_box.setDefaultButton(ignore)
        self.message_box.setEscapeButton(no)

        self.message_box.setWindowModality(Qt.WindowModal)
        self.message_box.show()

        def message_box_button_clicked(button):
            if button == ok:
                self.label.setText("Ok")
            elif button == ignore:
                self.label.setText("ignore")
            elif self.message_box.buttonRole(button) == QMessageBox.NoRole:
                self.label.setText("按钮NoRole")

        self.message_box.buttonClicked.connect(message_box_button_clicked)


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