Python PyQt5 QMessageBox不能打開

Question

我想按下infoButton時打開一個消息框。它運行infoDialogue方法，因爲它打印「我在這裏」，但它不打開infoBox。我錯過了什麼？

我使用python 3.5 PyQt5

謝謝！

下面的代碼：

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_()) 

Answer 1

您可能需要一個

infoBox.exec_() 

末實際執行它