从其他函数更新对象创建的paintEvent的颜色

你不应该打电话 paintEvent() 正如您已经知道的,您应该做的就是告诉GUI您需要重新绘制,我们可以使用这个方法 repaint() 和 update() . 第一个方法要求同步更新,而在第二个方法中,我更喜欢第二个方法。

def __init__(self, foo_params):
    super(Foo_class, self).__init__(super_foo_params)
    self._text = "Welcome"
    self._rect_color = QtGui.QColor(200, 0, 0)

def paintEvent(self, event):
    super(Foo_class, self).paintEvent(event)
    painter = QPainter(self)
    pen = QtGui.QPen(QtCore.Qt.black, 2, QtCore.Qt.SolidLine)

    painter.setPen(QtCore.Qt.red)
    painter.setBrush(self._rect_color)
    rect = QRect(1450,325,380,498)
    painter.drawRect(rect)
    painter.setFont(QtGui.QFont('Consolas', 30))
    painter.setPen(QtGui.QColor(0, 0, 0))
    painter.drawText(QRect(1450,325,380,498), QtCore.Qt.AlignCenter, self._text)

def updateRectanle(conditon):
    if condition: 
        self._rect_color = new_color
        self._text = new_text
        self.update()