功能介绍：（1）点击页面上的图片打开指定的网址（2）点击按钮，更换背景图

一、ui界面

关于如何打开Qt Designer进行界面设计，可参见 https://blog.csdn.net/maidu_xbd/article/details/85696510

拉入graphicsView、Push Button、Label控件进行简单的页面布局。

图片资源导入方式：Qt Designer右下角 资源管理器–>铅笔图标

为graphicsView、Label添加背景图：在控件上右键单击选择改变样式表，可以选择控件的各种样式。为按钮添加信号与槽，添加方法见 https://blog.csdn.net/maidu_xbd/article/details/85696510 

保存ui文件

二、鼠标发射信号实现及定义槽函数

在Visual Studio Code中编译ui文件为.py文件

注意：需要编译res.qrc文件为相应的py文件，否则图片获取不到。

鼠标发射信号（mousePressEvent）作用于graphicsView控件，代码实现如下：

class main(QDialog):
    def __init__(self):
        super(main,self).__init__()
        print("Dialog is called!")
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)
        self.ui.graphicsView.mousePressEvent=self.graphicsView_clicked

    def graphicsView_clicked(self,e):
        webbrowser.open("blog.csdn.net/maidu_xbd")

webbrowser.open(“….”)用于打开网页

点击Push Button实现更换Label背景图的槽函数如下：

def Btn1_clicked(self):
    self.ui.label.setStyleSheet("border-image: url(:/images/1.jpg);")
def Btn2_clicked(self):
    self.ui.label.setStyleSheet("border-image: url(:/images/2.jpg);")
def Btn3_clicked(self):
    self.ui.label.setStyleSheet("border-image: url(:/images/3.jpg);")

完整代码main.py：

from PyQt5 import QtCore, QtGui, QtWidgets
from Ui_showImg import Ui_Dialog
import webbrowser
from PyQt5.QtWidgets import *
import sys

class main(QDialog):
    def __init__(self):
        super(main,self).__init__()
        print("Dialog is called!")
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)
        self.ui.graphicsView.mousePressEvent=self.graphicsView_clicked

    def graphicsView_clicked(self,e):
        webbrowser.open("blog.csdn.net/maidu_xbd")

    def Btn1_clicked(self):
        self.ui.label.setStyleSheet("border-image: url(:/images/1.jpg);")
    def Btn2_clicked(self):
        self.ui.label.setStyleSheet("border-image: url(:/images/2.jpg);")
    def Btn3_clicked(self):
        self.ui.label.setStyleSheet("border-image: url(:/images/3.jpg);")
if __name__ == "__main__":
    app = QApplication(sys.argv)
    main = main()
    #显示主界面
    main.show()
    sys.exit(app.exec_())

Ui_showImg.py如下：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'c:\Users\lenovo\Desktop\python_exer\PYQt5\显示图片\showImg.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(566, 294)
        self.graphicsView = QtWidgets.QGraphicsView(Dialog)
        self.graphicsView.setGeometry(QtCore.QRect(40, 30, 161, 191))
        self.graphicsView.setStyleSheet("border-image: url(:/images/捕获.PNG);")
        self.graphicsView.setObjectName("graphicsView")
        self.label = QtWidgets.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(260, 50, 251, 131))
        self.label.setStyleSheet("border-image: url(:/images/0.jpg);")
        self.label.setText("")
        self.label.setObjectName("label")
        self.Btn1 = QtWidgets.QPushButton(Dialog)
        self.Btn1.setGeometry(QtCore.QRect(260, 200, 75, 23))
        self.Btn1.setStyleSheet("background-color: rgb(255, 170, 0);")
        self.Btn1.setObjectName("Btn1")
        self.Btn2 = QtWidgets.QPushButton(Dialog)
        self.Btn2.setGeometry(QtCore.QRect(350, 200, 75, 23))
        self.Btn2.setStyleSheet("background-color: rgb(170, 170, 255);")
        self.Btn2.setObjectName("Btn2")
        self.Btn3 = QtWidgets.QPushButton(Dialog)
        self.Btn3.setGeometry(QtCore.QRect(440, 200, 75, 23))
        self.Btn3.setStyleSheet("background-color: rgb(255, 0, 255);")
        self.Btn3.setObjectName("Btn3")

        self.retranslateUi(Dialog)
        self.Btn1.clicked.connect(Dialog.Btn1_clicked)
        self.Btn2.clicked.connect(Dialog.Btn2_clicked)
        self.Btn3.clicked.connect(Dialog.Btn3_clicked)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.Btn1.setText(_translate("Dialog", "换图1"))
        self.Btn2.setText(_translate("Dialog", "换图2"))
        self.Btn3.setText(_translate("Dialog", "换图3"))

import res_rc