如何在運行時使用 pyqt5 將原始圖像替換為另一個圖像？

Question

我正在嘗試制作可以通過圖形表示顯示天氣網關閉或向上的應用程序。 對於我正在使用 pyqt5 的任務，但是當我嘗試執行此操作時，它只是一次又一次地重疊在同一圖像上。

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 Class - 繼承：QFrame。

QFrame Class - 繼承：QWidget。

無需每次都創建 - self.network = QLabel (self) 。

您不需要global變量。

試試看：

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()