PYQT5 QscrollArea(滚动条)的使用

import sys
from 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_())