本示例中，演示了QScrollArea的使用，以及QScrollBar的样式设定，在代码中使用setStyleSheet设置样式，记得要优先设置scrollArea，再设置窗口的样式，不然QScrollBar的样式会不起作用，使用QSS设置没有这个要求。
效果图：
源代码：
import sys
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtWidgets import QDialog, QApplication, QPushButton, QScrollAreafrom PyQt5 import QtCore, QtGui, QtWidgetsclass Ui_Form(object):def setupUi(self, Form):Form.setObjectName("Form")Form.resize(644, 488)self.verticalLayout = QtWidgets.QVBoxLayout(Form)self.verticalLayout.setObjectName("verticalLayout")self.scrollArea = QtWidgets.QScrollArea(Form)self.scrollArea.setWidgetResizable(True)self.scrollArea.setObjectName("scrollArea")self.scrollAreaWidgetContents = QtWidgets.QWidget()self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 624, 468))self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.scrollAreaWidgetContents)self.verticalLayout_2.setObjectName("verticalLayout_2")self.pushButton = QtWidgets.QPushButton(self.scrollAreaWidgetContents)self.pushButton.setObjectName("pushButton")self.verticalLayout_2.addWidget(self.pushButton)self.scrollArea.setWidget(self.scrollAreaWidgetContents)self.verticalLayout.addWidget(self.scrollArea)self.retranslateUi(Form)QtCore.QMetaObject.connectSlotsByName(Form)def retranslateUi(self, Form):_translate = QtCore.QCoreApplication.translateForm.setWindowTitle(_translate("Form", "Form"))self.pushButton.setText(_translate("Form", "PushButton"))class DEMO(QDialog, Ui_Form):def __init__(self):super(DEMO, self).__init__()self.setupUi(self)self.resize(955, 625)for x in range(30):self.scrollAreaWidgetContents.layout().addWidget(QPushButton(f'Button{x}'))self.scrollAreaWidgetContents.layout().setContentsMargins(2, 2, 2, 2)self.scrollArea.setWidgetResizable(True)self.scrollArea.setStyleSheet("""QScrollBar:vertical {border: none;background: #E2E2E2;width: 15px;margin: 10px 0;}QScrollBar::handle:vertical {background: blue;min-height: 20px;}QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical{width: 0px;height: 0px;}""")self.setStyleSheet("""#scrollArea {border: none;border-radius: 6px;padding: 4px;background-color: #ffffff;}#scrollAreaWidgetContents{background-color: rgb(255,255,255,0);}""")if __name__ == '__main__':QApplication.setAttribute(Qt.AA_EnableHighDpiScaling)QApplication.setAttribute(Qt.AA_UseHighDpiPixmaps)QGuiApplication.setHighDpiScaleFactorRoundingPolicy(Qt.HighDpiScaleFactorRoundingPolicy.PassThrough)app = QApplication(sys.argv)main_win = DEMO()main_win.show()sys.exit(app.exec_())
