在使用pyqt5时，如何在运行时用另一个映像替换原始映像？

Question

我试图使应用程序，可以显示天气网是下降或上升的图形表示。对于这个任务，我使用的是pyqt5，但当我尝试这样做时，它只是在同一个图像上反复重叠。你知道吗

time2 = ""
class DigitalClock(QLCDNumber, QWidget):
   def __init__(self, parent=None):
        super(DigitalClock, self).__init__(parent)
        self.setWindowTitle("Digital Clock")
        self.showFullScreen()
        self.mainlayout = QHBoxLayout()
        timer = QTimer(self)
        timer.timeout.connect(self.ui)
        timer.start(1000)
        self.ui()
        self.show()

    def ui(self):
        global time2
        time = QTime.currentTime()
        text = time.toString('hh:mm')
        if (time.second() % 2) == 0:
           text = text[:2]+" "+ text[3:]


        if text[3:] != time2:
            if os.system("ping -c 1 192.168.63.145") == 0:
                self.network = QLabel(self)
                self.network.setPixmap(QPixmap("signal-bars.png"))
                self.network.move(50,300)
                self.network.show()
                time2 = text[3:]
            else:
                self.network = QLabel(self)
                self.network.setPixmap(QPixmap("no-internet.png"))
                time2 = text[3:]
            self.network.move(50,300)
            self.network.show()
        self.display(text)




def main():
    app = QApplication(sys.argv)
    clock = DigitalClock()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

Answer 1

QLCDNumber类-继承：QFrame。你知道吗

QFrame类-继承：QWidget。你知道吗

不需要每次都创建-self.network = QLabel (self)。你知道吗

您不需要global变量。你知道吗

试试看：

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


#time2 = ""

class DigitalClock(QLCDNumber):                            #, QWidget):
    def __init__(self, parent=None):
        super(DigitalClock, self).__init__(parent)

        self.time2 = True                                   # +
        self.network = QLabel(self)                         # +
        self.network.setGeometry(50, 300, 150, 150)         # +

        self.setWindowTitle("Digital Clock")
        self.showFullScreen()
        self.mainlayout = QHBoxLayout()                     # ?

        timer = QTimer(self)
        timer.timeout.connect(self.ui)
        self.ui()
        timer.start(1000)

    def ui(self):
#        global time2                                        #  -
        time = QTime.currentTime()
        text = time.toString('hh:mm')
        if (time.second() % 2) == 0:
           text = text[:2]+" "+ text[3:]


#        if text[3:] != time2:
#            if os.system("ping -c 1 192.168.63.145") == 0:
        if self.time2:
#            self.network = QLabel(self)                      #  -
            self.network.setPixmap(QPixmap("im.png").scaled(150, 150, Qt.KeepAspectRatio, Qt.FastTransformation)) 
#            time2 = text[3:]
        else:
#            self.network = QLabel(self)
            self.network.setPixmap(QPixmap("Ok.png").scaled(150, 150, Qt.KeepAspectRatio, Qt.FastTransformation))
#            time2 = text[3:]

        self.time2 = not self.time2

        self.display(text)


def main():
    app = QApplication(sys.argv)
    clock = DigitalClock()
    clock.show()                      # +
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()