Python PyQt5学习之样式设置详解

为标签添加背景图片

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

if __name__ == "__main__":
   app = QApplication(sys.argv)
   win = QMainWindow()
   label = QLabel()
   label.setToolTip("这是一个文本标签")
   label.setStyleSheet("QLabel{border-image:url(./pyqt5/images/python.jpg)};")
   label.setFixedWidth(320)
   label.setFixedHeight(200)

win.setCentralWidget(label)
   win.show()
   sys.exit(app.exec_())

为按钮添加背景图片

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

if __name__ == "__main__":
   app = QApplication(sys.argv)
   win = QWidget()
   layout = QVBoxLayout()
   btn1 = QPushButton("按钮1")
   btn1.setMaximumSize(48, 48)
   btn1.setMinimumSize(48, 48)
   style = '''
       QPushButton {
           border-radius: 30px;
           background-image: url('./pyqt5/images/left.png');
       }
   '''
   btn1.setStyleSheet(style)
   layout.addWidget(btn1)
   win.setLayout(layout)
   win.show()
   sys.exit(app.exec_())

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

if __name__ == "__main__":
   app = QApplication(sys.argv)
   win = QWidget()
   btn1 = QPushButton("按钮1")
   btn1.setFixedSize(50, 50)
   btn1.setObjectName("btn1")
   style = '''
       #btn1{
           border-radius: 30px;
           background-image: url('./pyqt5/images/left.png')
       }

#btn1:hover{
           border-radius: 30px;
           background-image: url('./pyqt5/images/leftHover.png')
       }

#btn1:Pressed{
           border-radius: 30px;
           background-image: url('./pyqt5/images/leftPressed.png')
       }
   '''
   btn1.setStyleSheet(style)
   layout = QVBoxLayout()
   layout.addWidget(btn1)
   win.setLayout(layout)
   win.show()
   sys.exit(app.exec_())

缩放图片

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

if __name__ == "__main__":
   app = QApplication(sys.argv)
   win = QWidget()
   pic = r"./pyqt5/images/Cloudy_72px.png"
   img = QImage(pic)
   label1 = QLabel()
   label1.setFixedWidth(120)
   label1.setFixedHeight(120)
   result = img.scaled(label1.width(), label1.height(), Qt.IgnoreAspectRatio, Qt.SmoothTransformation)

label1.setPixmap(QPixmap.fromImage(result))
   label2 = QLabel()
   label2.setPixmap(QPixmap.fromImage(img))
   layout = QVBoxLayout()
   layout.addWidget(label2)
   layout.addWidget(label1)
   win.setLayout(layout)
   win.show()
   sys.exit(app.exec_())

设置窗口透明

import sys

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

if __name__ == "__main__":
   app = QApplication(sys.argv)
   win = QMainWindow()
   win.setWindowTitle("设置窗口透明")
   win.setWindowOpacity(0.5) # 设置窗口透明  透明度取值范围:0.0(全透明)~1.0(不透明)，默认值1.0
   win.show()
   sys.exit(app.exec_())

来源：https://blog.csdn.net/songyulong8888/article/details/128131993