python - 如何使用pyqt5在运行时用另一个图像替换原始图像？

Question

我正在尝试制作可以通过图形表示显示天气网关闭或打开的应用程序。对于我使用 pyqt5 的任务，但是当我尝试执行此操作时，它只是一次又一次地重叠在同一张图像上。

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 类 - 继承:QFrame。

QFrame 类 - 继承:QWidget。

无需每次都创建 - self.network = QLabel (self)。

您不需要全局变量。

尝试一下:

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()