页面加载后显示消息框 pyqt5

Question

我有一个 PyQt5 向导，在第二页上，我希望行为根据之前的内容进行更改。

我已经实现了initializePage

def initializePage(self): 
if self.altThing:
self.onloadbtn.show()
# .. do Something
QMessageBox.about(self, 'Hello', 'Hello') #Pops up before the page is rendered
# do other stuff..

我希望页面先加载，然后做一些事情，例如下载文件并显示进度条等，但直到页面加载。

发生的情况是QMessageBox将在页面加载之前弹出。

下面是一个MVCE

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

class Wizard(QWizard):
def __init__(self, parent=None):
super(Wizard, self).__init__(parent)
self.addPage(EnterToken(self)) 
self.addPage(ProcessData(self))
self.buttons = [self.button(t) for t in (QWizard.NextButton, QWizard.FinishButton)]
for btn in self.buttons:
btn.installEventFilter(self)
def eventFilter(self, obj, event):
if obj in self.buttons and event.type() == QEvent.Show:
obj.setDefault(False)
return super(Wizard, self).eventFilter(obj, event)
class EnterToken(QWizardPage):
def __init__(self, parent=None):
super(EnterToken, self).__init__(parent)
self.setTitle("Enter your token here")
self.setSubTitle(" ")           
# Enter Token Widgets
self.label = QLabel()
self.enter_token_box = QLineEdit()        
self.btn = QPushButton('OK')
# layout options
layout = QVBoxLayout()
layout.addWidget(self.label)        
self.label.setText("Enter Your 12 Digit Code.")
layout.addWidget(self.enter_token_box)
layout.addWidget(self.btn)
# Enter Key TRigger
self.enter_token_box.returnPressed.connect(self._EnterToken)
self.btn.clicked.connect(self._EnterToken)
self.setLayout(layout)         
def _EnterToken(self):
""" Method for processing user input after the button is pressed"""
pass

class ProcessData(QWizardPage):
""" Sensor Code Entry """
def __init__(self, parent=None):
super(ProcessData, self).__init__(parent)        
self.altThing = True
# num of logs combo box
self.num_logs_combo = QComboBox(self)
self.alt = QComboBox(self)

# ~buttons
self.btn = QPushButton('OK')
self.onloadbtn = QPushButton('OK')
layout = QVBoxLayout()
layout.addWidget(self.num_logs_combo)
layout.addWidget(self.alt)
layout.addWidget(self.btn) 
layout.addWidget(self.onloadbtn)  
self.onloadbtn.hide()
self.alt.hide()
self.setLayout(layout)  
self.btn.clicked.connect(self._EnterToken)  

def initializePage(self): 
if self.altThing:
self.onloadbtn.show()
# .. do Something
QMessageBox.about(self, 'Hello', 'Hello') #Pops up before the page is rendered
# do other stuff..
def _EnterToken(self):
""" Method for processing user input after the button is pressed"""
pass
if __name__ == '__main__':
app = QApplication(sys.argv)
wizard = Wizard()
wizard.show()
sys.exit(app.exec_())

Answer 1

initializePage()方法在显示页面之前调用，因此您不应该在该部分中调用该逻辑，可能的解决方案是使用QTimer。

class ProcessData(QWizardPage):
""" Sensor Code Entry """
def __init__(self, parent=None):
super(ProcessData, self).__init__(parent)        
self.altThing = True
# num of logs combo box
self.num_logs_combo = QComboBox(self)
self.alt = QComboBox(self)
# ~buttons
self.btn = QPushButton('OK')
self.onloadbtn = QPushButton('OK')
layout = QVBoxLayout(self)
layout.addWidget(self.num_logs_combo)
layout.addWidget(self.alt)
layout.addWidget(self.btn) 
layout.addWidget(self.onloadbtn)  
self.onloadbtn.hide()
self.alt.hide()
self.btn.clicked.connect(self._EnterToken) 
def foo(self):
if self.altThing:
# .. do Something
QMessageBox.about(self, 'Hello', 'Hello') #Pops up before the page is rendered
# do other stuff..""
def initializePage(self):
QTimer.singleShot(0, self.foo)
def _EnterToken(self):
""" Method for processing user input after the button is pressed"""
pass