我建议您继承QMainWindow并实现该Ui_MainWindow接口，以绘制，QGraphicsView您必须使用QGraphicsScene，并使用其方法，在这种情况下使用addRect()。
from PyQt5 import QtCore, QtGui, QtWidgets
class MyFirstGuiProgram(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
QtWidgets.QMainWindow.__init__(self, parent=parent)
self.setupUi(self)
scene = QtWidgets.QGraphicsScene()
self.graphicsView.setScene(scene)
pen = QtGui.QPen(QtCore.Qt.green)
side = 20
for i in range(16):
for j in range(16):
r = QtCore.QRectF(QtCore.QPointF(i*side, j*side), QtCore.QSizeF(side, side))
scene.addRect(r, pen)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = MyFirstGuiProgram()
w.show()
sys.exit(app.exec_())
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