Question

我正在开发一个应用程序，该应用程序在启动时需要检查各种事情，例如是否找到了模块，与微控制器的连接是否正常等。因此，我决定制作一个初始屏幕，其中每个步骤都显示一条消息。我想做的是制作几幅图像，其文字分别是（'正在加载模块...'），（'正在检查连接...'），并在每次运行该步骤时进行更改。以下代码是我的想法：

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_()

此代码仅显示最后一张图像，而不是每张相隔3秒。关于如何解决此问题的任何线索？

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()

如何在启动画面中更改图像

1 个答案: