如何更改启动屏幕内的图像

Question

我正在开发一款应用程序，该应用程序在启动时需要检查各种情况，如是否找到模块、是否与微控制器的连接正常等。因此，我决定制作一个启动屏幕，其中每个步骤都显示一条消息。我想的是制作几张图片，上面写着("加载模块…"(、("检查连接…"(，每次运行步骤时都要更改它们。以下代码是我想到的：

images = ["path1", "path2", ...]
app = QApplication(sys.argv)
for i in images:
pixmap = QPixmap(i)
splash = QSplashScreen(pixmap)
splash.show()
QTimer.singleShot(3000, splash.close) #the timer is just to pretend some process is running
app.processEvents()
app.exec_()

此代码只显示最后一个图像，而不是每个图像间隔3秒。有什么线索可以帮我解决这个问题吗？

Answer 1

您必须创建指示状态的信号并更改图像：

import sys
from PyQt5 import QtCore, QtGui, QtWidgets

class Manager(QtCore.QObject):
"""Class that simulates the loading steps"""
started = QtCore.pyqtSignal()
loaded_modules = QtCore.pyqtSignal()
connected = QtCore.pyqtSignal()
finished = QtCore.pyqtSignal()
def __init__(self, parent=None):
super().__init__(parent)
def start(self):
self.started.emit()
for i, step in enumerate((self.loaded_modules, self.connect, self.finish), 1):
QtCore.QTimer.singleShot(i * 2000, step)
def load_modules(self):
self.loaded_modules.emit()
def connect(self):
self.connected.emit()
def finish(self):
self.finished.emit()

class SplashScreen(QtWidgets.QSplashScreen):
@QtCore.pyqtSlot()
def handle_started(self):
self.show()
self.setPixmap(QtGui.QPixmap("started.png"))
@QtCore.pyqtSlot()
def handle_loaded_modules(self):
self.setPixmap(QtGui.QPixmap("loaded_modules.png"))
@QtCore.pyqtSlot()
def handle_connected(self):
self.setPixmap(QtGui.QPixmap("connected.png"))
@QtCore.pyqtSlot()
def handle_finished(self):
self.close()

def main():
app = QtWidgets.QApplication(sys.argv)
w = QtWidgets.QMainWindow()
w.resize(640, 480)
manager = Manager()
splash_screen = SplashScreen()
manager.started.connect(splash_screen.handle_started)
manager.loaded_modules.connect(splash_screen.handle_loaded_modules)
manager.connected.connect(splash_screen.handle_connected)
manager.finished.connect(splash_screen.handle_finished)
manager.finished.connect(w.show)
manager.start()
app.exec_()

if __name__ == "__main__":
main()