python之如何在不影响 Pyqt5 中的小部件的情况下将背景图像添加到主窗口

我想在我的主窗口中添加背景图像而不更改其中按钮的背景图像并且还需要保持纵横比

我试过

self.centralWidget.setStyleSheet("background-image: url(The_Project_logo.png); background-repeat: no-repeat; background-position: center")

但这会改变所有小部件的背景图像

请您参考如下方法:

试一试:

from PyQt5.QtWidgets import * 
 
class MainWindow(QMainWindow): 
    def __init__(self): 
        super().__init__() 
 
        self.centralwidget = QWidget() 
        self.setCentralWidget(self.centralwidget) 
 
        self.pushButton1 = QPushButton("Button 1", self.centralwidget) 
        self.pushButton2 = QPushButton("Button 2", self.centralwidget) 
 
        lay = QHBoxLayout(self.centralwidget) 
        lay.addWidget(self.pushButton1) 
        lay.addWidget(self.pushButton2) 
 
 
stylesheet = """ 
    MainWindow { 
        background-image: url("D:/_Qt/img/cat.jpg");  
        background-repeat: no-repeat;  
        background-position: center; 
    } 
""" 
 
if __name__ == "__main__": 
    import sys 
    app = QApplication(sys.argv) 
    app.setStyleSheet(stylesheet)     # <--- 
    window = MainWindow() 
    window.resize(640, 640) 
    window.show() 
    sys.exit(app.exec_()) 

from PyQt5 import QtCore, QtGui, QtWidgets 
 
class Ui_MainWindow(object): 
    def setupUi(self, MainWindow): 
 
        MainWindow.setObjectName("MainWindow") 
        MainWindow.resize(400, 300) 
        self.centralWidget = QtWidgets.QWidget(MainWindow) 
        self.centralWidget.setObjectName("centralWidget") 
 
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.centralWidget) 
 
        self.horizontalLayout_2.setContentsMargins(11, 11, 11, 11) 
        self.horizontalLayout_2.setSpacing(6) 
        self.horizontalLayout_2.setObjectName("horizontalLayout_2") 
        self.horizontalLayout = QtWidgets.QHBoxLayout() 
        self.horizontalLayout.setSpacing(6) 
        self.horizontalLayout.setObjectName("horizontalLayout") 
        self.start_button = QtWidgets.QPushButton(self.centralWidget) 
        self.start_button.setObjectName("start_button") 
 
        self.horizontalLayout.addWidget(self.start_button) 
        self.stop_button = QtWidgets.QPushButton(self.centralWidget) 
        self.stop_button.setObjectName("stop_button") 
        self.horizontalLayout.addWidget(self.stop_button) 
        self.horizontalLayout_2.addLayout(self.horizontalLayout) 
        MainWindow.setCentralWidget(self.centralWidget) 
        self.menuBar = QtWidgets.QMenuBar(MainWindow) 
        self.menuBar.setGeometry(QtCore.QRect(0, 0, 400, 26)) 
        self.menuBar.setObjectName("menuBar") 
        MainWindow.setMenuBar(self.menuBar) 
        self.mainToolBar = QtWidgets.QToolBar(MainWindow) 
        self.mainToolBar.setObjectName("mainToolBar") 
        MainWindow.addToolBar(QtCore.Qt.TopToolBarArea, self.mainToolBar) 
        self.statusBar = QtWidgets.QStatusBar(MainWindow) 
        self.statusBar.setObjectName("statusBar") 
        MainWindow.setStatusBar(self.statusBar) 
 
        self.retranslateUi(MainWindow) 
        QtCore.QMetaObject.connectSlotsByName(MainWindow) 
 
    def retranslateUi(self, MainWindow): 
        _translate = QtCore.QCoreApplication.translate 
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow")) 
        self.start_button.setText(_translate("MainWindow", "Start")) 
        self.stop_button.setText(_translate("MainWindow", "Stop")) 
 
 
class MyWindow(QtWidgets.QMainWindow, Ui_MainWindow): 
    def __init__(self): 
        super().__init__() 
 
        self.setupUi(self) 
 
 
stylesheet = """ 
    QMainWindow { 
        background-image: url("D:/_Qt/img/cat.jpg");  
        background-repeat: no-repeat;  
        background-position: center; 
    } 
""" 
 
if __name__ == "__main__": 
    import sys 
    app = QtWidgets.QApplication(sys.argv) 
    app.setStyleSheet(stylesheet) 
 
    w = MyWindow() 
#   MainWindow = QtWidgets.QMainWindow() 
#   ui = Ui_MainWindow() 
#   ui.setupUi(MainWindow) 
#   MainWindow.show() 
    w.show() 
 
    sys.exit(app.exec_())