在PYQT5中QscrollArea(滚动条)的使用方法

import sysfrom PyQt5.QtWidgets import *  class MainWindow(QMainWindow): def __init__(self,):  super(QMainWindow,self).__init__()  self.number = 0   w = QWidget()  self.setCentralWidget(w)   self.topFiller = QWidget()  self.topFiller.setMinimumSize(250, 2000)#######设置滚动条的尺寸  for filename in range(20):   self.MapButton = QPushButton(self.topFiller)   self.MapButton.setText(str(filename))   self.MapButton.move(10,filename*40)  ##创建一个滚动条  self.scroll = QScrollArea()  self.scroll.setWidget(self.topFiller)    self.vbox = QVBoxLayout()  self.vbox.addWidget(self.scroll)  w.setLayout(self.vbox)   self.statusBar().showMessage("底部信息栏")  self.resize(300, 500) if __name__ == "__main__": app = QApplication(sys.argv) mainwindow = MainWindow() mainwindow.show() sys.exit(app.exec_())