Python PyQt5 QMessageBox 未打开 [英] Python PyQt5 QMessageBox not opening

问题描述

当我按下 infoButton 时，我试图打开一个消息框.它运行 infoDialogue 方法，因为它打印我在这里"但它不打开信息框.我错过了什么?

I am trying to open a Message Box when I press the infoButton. It runs the infoDialogue method because it prints "I'm here" but it doesn't open the infoBox. What I'm missing?

我在 PyQt5 中使用 python 3.5

I'm using python 3.5 with PyQt5

谢谢！

代码如下:

import sys
from PyQt5.QtWidgets import (QApplication, QWidget, QToolTip, QPushButton, QMessageBox)
from PyQt5.QtCore import QCoreApplication
from PyQt5.QtGui import QIcon, QFont

class mainWindow(QWidget):

    def __init__(self, screenWidth, screenHeight, windowWidth=400, windowHeight=400):      
        super().__init__()
        self.screenWidth = screenWidth
        self.screenHeight = screenHeight              
        self.windowWidth = windowWidth
        self.windowHeight = windowHeight
        self.initUI()


    def initUI(self):
        QToolTip.setFont(QFont('SansSerif', 10))
        self.setToolTip('ToolTip Widget')

        exitButton = QPushButton('Exit', self)        
        exitButton.setToolTip("<b>Wish to Exit?</b>")        
        exitButton.resize(exitButton.sizeHint())       
        exitButton.move(100, 100)      
        exitButton.clicked.connect(QCoreApplication.instance().quit)           

        infoButton = QPushButton('Info', self) # Button that calls infoDialogue()
        infoButton.setToolTip('<b>ToolTip</b>')
        infoButton.resize(infoButton.sizeHint())
        infoButton.move(100, 200)
        infoButton.clicked.connect(self.infoDialogue)      

        positionX = (self.screenWidth - self.windowWidth) / 2
        positionY = (self.screenHeight - self.windowHeight) / 2
        self.setGeometry(positionX, positionY, self.windowWidth, self.windowHeight)

        self.setWindowTitle('Window Title')
        #self.setWindowIcon(QIcon('./icon.png'))

        self.show()


    def infoDialogue(self): ## Method to open a message box
        infoBox = QMessageBox() ##Message Box that doesn't run
        print("Im here")
        infoBox.setIcon(QMessageBox.Information)
        infoBox.setText("Informações Adicionais")
        infoBox.setInformativeText("Informative Text")
        infoBox.setWindowTitle("Window Title")
        infoBox.setDetailedText("Detailed Text")
        infoBox.setStandardButtons(QMessageBox.Ok | QMessageBox.Cancel)
        infoBox.setEscapeButton(QMessageBox.Close)       


    def closeEvent(self, event):        
        reply = QMessageBox.question(self, 'Exit', "Are you sure you want to exit?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)                                      
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    screenResolution = app.desktop().screenGeometry()
    screenWidth = screenResolution.width()
    screenHeight = screenResolution.height()
    example = mainWindow(screenWidth, screenHeight)
    sys.exit(app.exec_())

推荐答案

您可能需要一个

infoBox.exec_() 

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