Python高级进阶教程022期 pyqt5 qtimer实现图片轮播

import sys
from PyQt5.QtWidgets import QApplication,QWidget,QLabel
from PyQt5.QtCore import QTimer
from PyQt5.QtGui import QPixmap

class MyClass(QWidget):
    def __init__(self):
        super().__init__()
        self.n=1
        self.initUI()

    def initUI(self):
        self.setWindowTitle("刘金玉编程")
        self.resize(400,300)

        self.pm=QPixmap("./img/a" +str(self.n)+".jpg")
        self.lblpic=QLabel(self)
        self.lblpic.setPixmap(self.pm)
        self.lblpic.resize(200,200)
        self.lblpic.move(self.width()/2-self.lblpic.width()/2,50)
        self.lblpic.setScaledContents(True)

        lb12=QLabel(self)
        lb12.setText("图片轮播")
        lb12.move(180,20)

        timer1=QTimer(self)
        timer1.timeout.connect(self.timer_TimeOut)
        timer1.start(1000)
        self.show()

    def timer_TimeOut(self):
        self.n+=1
        if self.n>4:
            self.n=1
        self.pm = QPixmap("./img/a" + str(self.n) + ".jpg")
        self.lblpic.setPixmap(self.pm)

if __name__=="__main__":
    app=QApplication(sys.argv)

    mc=MyClass()
    sys.exit(app.exec_())